Make sure to drop the reference taken to the iommu platform device when
looking up its driver data during of_xlate().
Note that commit 1a26044954a6 ("iommu/exynos: add missing put_device()
call in exynos_iommu_of_xlate()") fixed the leak in a couple of error
paths, but the reference is still leaking on success.
Fixes: aa759fd376fb ("iommu/exynos: Add callback for initializing devices from device tree")
Cc: stable(a)vger.kernel.org # 4.2: 1a26044954a6
Cc: Marek Szyprowski <m.szyprowski(a)samsung.com>
Cc: Yu Kuai <yukuai3(a)huawei.com>
Acked-by: Robin Murphy <robin.murphy(a)arm.com>
Signed-off-by: Johan Hovold <johan(a)kernel.org>
---
drivers/iommu/exynos-iommu.c | 9 +++------
1 file changed, 3 insertions(+), 6 deletions(-)
diff --git a/drivers/iommu/exynos-iommu.c b/drivers/iommu/exynos-iommu.c
index b6edd178fe25..ce9e935cb84c 100644
--- a/drivers/iommu/exynos-iommu.c
+++ b/drivers/iommu/exynos-iommu.c
@@ -1446,17 +1446,14 @@ static int exynos_iommu_of_xlate(struct device *dev,
return -ENODEV;
data = platform_get_drvdata(sysmmu);
- if (!data) {
- put_device(&sysmmu->dev);
+ put_device(&sysmmu->dev);
+ if (!data)
return -ENODEV;
- }
if (!owner) {
owner = kzalloc(sizeof(*owner), GFP_KERNEL);
- if (!owner) {
- put_device(&sysmmu->dev);
+ if (!owner)
return -ENOMEM;
- }
INIT_LIST_HEAD(&owner->controllers);
mutex_init(&owner->rpm_lock);
--
2.49.1
Make sure to drop the references taken to the iommu platform devices
when looking up their driver data during probe_device().
Note that the arch data device pointer added by commit 604629bcb505
("iommu/omap: add support for late attachment of iommu devices") has
never been used. Remove it to underline that the references are not
needed.
Fixes: 9d5018deec86 ("iommu/omap: Add support to program multiple iommus")
Fixes: 7d6827748d54 ("iommu/omap: Fix iommu archdata name for DT-based devices")
Cc: stable(a)vger.kernel.org # 3.18
Cc: Suman Anna <s-anna(a)ti.com>
Acked-by: Robin Murphy <robin.murphy(a)arm.com>
Signed-off-by: Johan Hovold <johan(a)kernel.org>
---
drivers/iommu/omap-iommu.c | 2 +-
drivers/iommu/omap-iommu.h | 2 --
2 files changed, 1 insertion(+), 3 deletions(-)
diff --git a/drivers/iommu/omap-iommu.c b/drivers/iommu/omap-iommu.c
index 6fb93927bdb9..b87ce129fb1f 100644
--- a/drivers/iommu/omap-iommu.c
+++ b/drivers/iommu/omap-iommu.c
@@ -1675,6 +1675,7 @@ static struct iommu_device *omap_iommu_probe_device(struct device *dev)
}
oiommu = platform_get_drvdata(pdev);
+ put_device(&pdev->dev);
if (!oiommu) {
of_node_put(np);
kfree(arch_data);
@@ -1682,7 +1683,6 @@ static struct iommu_device *omap_iommu_probe_device(struct device *dev)
}
tmp->iommu_dev = oiommu;
- tmp->dev = &pdev->dev;
of_node_put(np);
}
diff --git a/drivers/iommu/omap-iommu.h b/drivers/iommu/omap-iommu.h
index 27697109ec79..50b39be61abc 100644
--- a/drivers/iommu/omap-iommu.h
+++ b/drivers/iommu/omap-iommu.h
@@ -88,7 +88,6 @@ struct omap_iommu {
/**
* struct omap_iommu_arch_data - omap iommu private data
* @iommu_dev: handle of the OMAP iommu device
- * @dev: handle of the iommu device
*
* This is an omap iommu private data object, which binds an iommu user
* to its iommu device. This object should be placed at the iommu user's
@@ -97,7 +96,6 @@ struct omap_iommu {
*/
struct omap_iommu_arch_data {
struct omap_iommu *iommu_dev;
- struct device *dev;
};
struct cr_regs {
--
2.49.1
Make sure to drop the reference taken to the iommu platform device when
looking up its driver data during probe_device().
Fixes: b17336c55d89 ("iommu/mediatek: add support for mtk iommu generation one HW")
Cc: stable(a)vger.kernel.org # 4.8
Cc: Honghui Zhang <honghui.zhang(a)mediatek.com>
Acked-by: Robin Murphy <robin.murphy(a)arm.com>
Signed-off-by: Johan Hovold <johan(a)kernel.org>
---
drivers/iommu/mtk_iommu_v1.c | 2 ++
1 file changed, 2 insertions(+)
diff --git a/drivers/iommu/mtk_iommu_v1.c b/drivers/iommu/mtk_iommu_v1.c
index 10cc0b1197e8..de9153c0a82f 100644
--- a/drivers/iommu/mtk_iommu_v1.c
+++ b/drivers/iommu/mtk_iommu_v1.c
@@ -435,6 +435,8 @@ static int mtk_iommu_v1_create_mapping(struct device *dev,
return -EINVAL;
dev_iommu_priv_set(dev, platform_get_drvdata(m4updev));
+
+ put_device(&m4updev->dev);
}
ret = iommu_fwspec_add_ids(dev, args->args, 1);
--
2.49.1
Make sure to drop the reference taken to the iommu platform device when
looking up its driver data during of_xlate().
Fixes: 7b2d59611fef ("iommu/ipmmu-vmsa: Replace local utlb code with fwspec ids")
Cc: stable(a)vger.kernel.org # 4.14
Cc: Magnus Damm <damm+renesas(a)opensource.se>
Acked-by: Robin Murphy <robin.murphy(a)arm.com>
Signed-off-by: Johan Hovold <johan(a)kernel.org>
---
drivers/iommu/ipmmu-vmsa.c | 2 ++
1 file changed, 2 insertions(+)
diff --git a/drivers/iommu/ipmmu-vmsa.c b/drivers/iommu/ipmmu-vmsa.c
index ffa892f65714..02a2a55ffa0a 100644
--- a/drivers/iommu/ipmmu-vmsa.c
+++ b/drivers/iommu/ipmmu-vmsa.c
@@ -720,6 +720,8 @@ static int ipmmu_init_platform_device(struct device *dev,
dev_iommu_priv_set(dev, platform_get_drvdata(ipmmu_pdev));
+ put_device(&ipmmu_pdev->dev);
+
return 0;
}
--
2.49.1
Make sure to drop the reference taken to the iommu platform device when
looking up its driver data during of_xlate().
Note that commit e2eae09939a8 ("iommu/qcom: add missing put_device()
call in qcom_iommu_of_xlate()") fixed the leak in a couple of error
paths, but the reference is still leaking on success and late failures.
Fixes: 0ae349a0f33f ("iommu/qcom: Add qcom_iommu")
Cc: stable(a)vger.kernel.org # 4.14: e2eae09939a8
Cc: Rob Clark <robin.clark(a)oss.qualcomm.com>
Cc: Yu Kuai <yukuai3(a)huawei.com>
Acked-by: Robin Murphy <robin.murphy(a)arm.com>
Signed-off-by: Johan Hovold <johan(a)kernel.org>
---
drivers/iommu/arm/arm-smmu/qcom_iommu.c | 10 ++++------
1 file changed, 4 insertions(+), 6 deletions(-)
diff --git a/drivers/iommu/arm/arm-smmu/qcom_iommu.c b/drivers/iommu/arm/arm-smmu/qcom_iommu.c
index c5be95e56031..9c1166a3af6c 100644
--- a/drivers/iommu/arm/arm-smmu/qcom_iommu.c
+++ b/drivers/iommu/arm/arm-smmu/qcom_iommu.c
@@ -565,14 +565,14 @@ static int qcom_iommu_of_xlate(struct device *dev,
qcom_iommu = platform_get_drvdata(iommu_pdev);
+ put_device(&iommu_pdev->dev);
+
/* make sure the asid specified in dt is valid, so we don't have
* to sanity check this elsewhere:
*/
if (WARN_ON(asid > qcom_iommu->max_asid) ||
- WARN_ON(qcom_iommu->ctxs[asid] == NULL)) {
- put_device(&iommu_pdev->dev);
+ WARN_ON(qcom_iommu->ctxs[asid] == NULL))
return -EINVAL;
- }
if (!dev_iommu_priv_get(dev)) {
dev_iommu_priv_set(dev, qcom_iommu);
@@ -581,10 +581,8 @@ static int qcom_iommu_of_xlate(struct device *dev,
* multiple different iommu devices. Multiple context
* banks are ok, but multiple devices are not:
*/
- if (WARN_ON(qcom_iommu != dev_iommu_priv_get(dev))) {
- put_device(&iommu_pdev->dev);
+ if (WARN_ON(qcom_iommu != dev_iommu_priv_get(dev)))
return -EINVAL;
- }
}
return iommu_fwspec_add_ids(dev, &asid, 1);
--
2.49.1
Make sure to drop the reference taken to the iommu platform device when
looking up its driver data during of_xlate().
Fixes: 46d1fb072e76 ("iommu/dart: Add DART iommu driver")
Cc: stable(a)vger.kernel.org # 5.15
Cc: Sven Peter <sven(a)kernel.org>
Acked-by: Robin Murphy <robin.murphy(a)arm.com>
Signed-off-by: Johan Hovold <johan(a)kernel.org>
---
drivers/iommu/apple-dart.c | 2 ++
1 file changed, 2 insertions(+)
diff --git a/drivers/iommu/apple-dart.c b/drivers/iommu/apple-dart.c
index 190f28d76615..1aa7c10262a8 100644
--- a/drivers/iommu/apple-dart.c
+++ b/drivers/iommu/apple-dart.c
@@ -790,6 +790,8 @@ static int apple_dart_of_xlate(struct device *dev,
struct apple_dart *cfg_dart;
int i, sid;
+ put_device(&iommu_pdev->dev);
+
if (args->args_count != 1)
return -EINVAL;
sid = args->args[0];
--
2.49.1
The patch below does not apply to the 5.10-stable tree.
If someone wants it applied there, or to any other stable or longterm
tree, then please email the backport, including the original git commit
id to <stable(a)vger.kernel.org>.
To reproduce the conflict and resubmit, you may use the following commands:
git fetch https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git/ linux-5.10.y
git checkout FETCH_HEAD
git cherry-pick -x 5bd398e20f0833ae8a1267d4f343591a2dd20185
# <resolve conflicts, build, test, etc.>
git commit -s
git send-email --to '<stable(a)vger.kernel.org>' --in-reply-to '2025082100-snowiness-profanity-df3a@gregkh' --subject-prefix 'PATCH 5.10.y' HEAD^..
Possible dependencies:
thanks,
greg k-h
------------------ original commit in Linus's tree ------------------
From 5bd398e20f0833ae8a1267d4f343591a2dd20185 Mon Sep 17 00:00:00 2001
From: Youssef Samir <quic_yabdulra(a)quicinc.com>
Date: Mon, 14 Jul 2025 18:30:39 +0200
Subject: [PATCH] bus: mhi: host: Detect events pointing to unexpected TREs
When a remote device sends a completion event to the host, it contains a
pointer to the consumed TRE. The host uses this pointer to process all of
the TREs between it and the host's local copy of the ring's read pointer.
This works when processing completion for chained transactions, but can
lead to nasty results if the device sends an event for a single-element
transaction with a read pointer that is multiple elements ahead of the
host's read pointer.
For instance, if the host accesses an event ring while the device is
updating it, the pointer inside of the event might still point to an old
TRE. If the host uses the channel's xfer_cb() to directly free the buffer
pointed to by the TRE, the buffer will be double-freed.
This behavior was observed on an ep that used upstream EP stack without
'commit 6f18d174b73d ("bus: mhi: ep: Update read pointer only after buffer
is written")'. Where the device updated the events ring pointer before
updating the event contents, so it left a window where the host was able to
access the stale data the event pointed to, before the device had the
chance to update them. The usual pattern was that the host received an
event pointing to a TRE that is not immediately after the last processed
one, so it got treated as if it was a chained transaction, processing all
of the TREs in between the two read pointers.
This commit aims to harden the host by ensuring transactions where the
event points to a TRE that isn't local_rp + 1 are chained.
Fixes: 1d3173a3bae7 ("bus: mhi: core: Add support for processing events from client device")
Signed-off-by: Youssef Samir <quic_yabdulra(a)quicinc.com>
[mani: added stable tag and reworded commit message]
Signed-off-by: Manivannan Sadhasivam <mani(a)kernel.org>
Reviewed-by: Jeff Hugo <jeff.hugo(a)oss.qualcomm.com>
Cc: stable(a)vger.kernel.org
Link: https://patch.msgid.link/20250714163039.3438985-1-quic_yabdulra@quicinc.com
diff --git a/drivers/bus/mhi/host/main.c b/drivers/bus/mhi/host/main.c
index 3041ee6747e3..52bef663e182 100644
--- a/drivers/bus/mhi/host/main.c
+++ b/drivers/bus/mhi/host/main.c
@@ -602,7 +602,7 @@ static int parse_xfer_event(struct mhi_controller *mhi_cntrl,
{
dma_addr_t ptr = MHI_TRE_GET_EV_PTR(event);
struct mhi_ring_element *local_rp, *ev_tre;
- void *dev_rp;
+ void *dev_rp, *next_rp;
struct mhi_buf_info *buf_info;
u16 xfer_len;
@@ -621,6 +621,16 @@ static int parse_xfer_event(struct mhi_controller *mhi_cntrl,
result.dir = mhi_chan->dir;
local_rp = tre_ring->rp;
+
+ next_rp = local_rp + 1;
+ if (next_rp >= tre_ring->base + tre_ring->len)
+ next_rp = tre_ring->base;
+ if (dev_rp != next_rp && !MHI_TRE_DATA_GET_CHAIN(local_rp)) {
+ dev_err(&mhi_cntrl->mhi_dev->dev,
+ "Event element points to an unexpected TRE\n");
+ break;
+ }
+
while (local_rp != dev_rp) {
buf_info = buf_ring->rp;
/* If it's the last TRE, get length from the event */
Hello,
Status summary for stable/linux-6.12.y
Dashboard:
https://d.kernelci.org/c/stable/linux-6.12.y/a9152eb181adaac576e8ac1ab79989…
giturl: https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git
branch: linux-6.12.y
commit hash: a9152eb181adaac576e8ac1ab79989881e0f301b
origin: maestro
test start time: 2025-10-06 09:30:07.031000+00:00
Builds: 44 ✅ 1 ❌ 0 ⚠️
Boots: 172 ✅ 4 ❌ 5 ⚠️
Tests: 10782 ✅ 945 ❌ 2510 ⚠️
### POSSIBLE REGRESSIONS
Hardware: imx6q-udoo
> Config: multi_v7_defconfig
- Architecture/compiler: arm/gcc-12
- kselftest.dt
last run: https://d.kernelci.org/test/maestro:68e399ac9512ca5274538de3
history: > ✅ > ❌
### FIXED REGRESSIONS
No fixed regressions observed.
### UNSTABLE TESTS
No unstable tests observed.
This branch has 1 pre-existing build issues. See details in the dashboard.
Sent every day if there were changes in the past 24 hours.
Legend: ✅ PASS ❌ FAIL ⚠️ INCONCLUSIVE
--
This is an experimental report format. Please send feedback in!
Talk to us at kernelci(a)lists.linux.dev
Made with love by the KernelCI team - https://kernelci.org
For idpf:
Milena fixes a memory leak in the idpf reset logic when the driver resets
with an outstanding Tx timestamp.
Emil fixes a race condition in idpf_vport_stop() by using
test_and_clear_bit() to ensure we execute idpf_vport_stop() once.
For ixgbe and ixgbevf:
Jedrzej fixes an issue with reporting link speed on E610 VFs.
Jedrzej also fixes the VF mailbox API incompatibilities caused by the
confusion with API v1.4, v1.5, and v1.6. The v1.4 API introduced IPSEC
offload, but this was only supported on Linux hosts. The v1.5 API
introduced a new mailbox API which is necessary to resolve issues on ESX
hosts. The v1.6 API introduced a new link management API for E610. Jedrzej
introduces a new v1.7 API with a feature negotiation which enables properly
checking if features such as IPSEC or the ESX mailbox APIs are supported.
This resolves issues with compatibility on different hosts, and aligns the
API across hosts instead of having Linux require custom mailbox API
versions for IPSEC offload.
Koichiro fixes a KASAN use-after-free bug in ixgbe_remove().
Signed-off-by: Jacob Keller <jacob.e.keller(a)intel.com>
---
Emil Tantilov (2):
idpf: convert vport state to bitmap
idpf: fix possible race in idpf_vport_stop()
Jedrzej Jagielski (4):
ixgbevf: fix getting link speed data for E610 devices
ixgbe: handle IXGBE_VF_GET_PF_LINK_STATE mailbox operation
ixgbevf: fix mailbox API compatibility by negotiating supported features
ixgbe: handle IXGBE_VF_FEATURES_NEGOTIATE mbox cmd
Koichiro Den (1):
ixgbe: fix too early devlink_free() in ixgbe_remove()
Milena Olech (1):
idpf: cleanup remaining SKBs in PTP flows
drivers/net/ethernet/intel/idpf/idpf.h | 12 +-
drivers/net/ethernet/intel/ixgbe/ixgbe_mbx.h | 15 ++
drivers/net/ethernet/intel/ixgbevf/defines.h | 1 +
drivers/net/ethernet/intel/ixgbevf/ixgbevf.h | 7 +
drivers/net/ethernet/intel/ixgbevf/mbx.h | 8 +
drivers/net/ethernet/intel/ixgbevf/vf.h | 1 +
drivers/net/ethernet/intel/idpf/idpf_ethtool.c | 10 +-
drivers/net/ethernet/intel/idpf/idpf_lib.c | 23 ++-
drivers/net/ethernet/intel/idpf/idpf_ptp.c | 3 +
.../net/ethernet/intel/idpf/idpf_singleq_txrx.c | 2 +-
drivers/net/ethernet/intel/idpf/idpf_txrx.c | 2 +-
drivers/net/ethernet/intel/idpf/idpf_virtchnl.c | 4 +-
.../net/ethernet/intel/idpf/idpf_virtchnl_ptp.c | 1 +
drivers/net/ethernet/intel/ixgbe/ixgbe_main.c | 3 +-
drivers/net/ethernet/intel/ixgbe/ixgbe_sriov.c | 79 +++++++++
drivers/net/ethernet/intel/ixgbevf/ipsec.c | 10 ++
drivers/net/ethernet/intel/ixgbevf/ixgbevf_main.c | 34 +++-
drivers/net/ethernet/intel/ixgbevf/vf.c | 182 +++++++++++++++++----
18 files changed, 335 insertions(+), 62 deletions(-)
---
base-commit: daa26ea63c6f848159821cd9b3cbe47cddbb0a1c
change-id: 20251001-jk-iwl-net-2025-10-01-92cd2a626ff7
Best regards,
--
Jacob Keller <jacob.e.keller(a)intel.com>
From: Nathan Chancellor <nathan(a)kernel.org>
[ Upstream commit d87208128a3330c0eab18301ab39bdb419647730 ]
'-mpreferred-stack-boundary' (the GCC option) and '-mstack-alignment'
(the clang option) have been supported in their respective compilers for
some time, so it is unnecessary to check for support for them via
cc-option. '-mpreferred-stack-boundary=3' had a restriction on
'-mno-sse' until GCC 7.1 but that is irrelevant for most of the kernel,
which includes '-mno-sse'.
Move to simple Kconfig checks to avoid querying the compiler for the
flags that it supports.
Signed-off-by: Nathan Chancellor <nathan(a)kernel.org>
Signed-off-by: Borislav Petkov (AMD) <bp(a)alien8.de>
Link: https://lore.kernel.org/20250814-x86-min-ver-cleanups-v1-2-ff7f19457523@ker…
Signed-off-by: Sasha Levin <sashal(a)kernel.org>
---
LLM Generated explanations, may be completely bogus:
Based on my comprehensive analysis of this commit, here is my
determination:
## Backport Status: NO
### Extensive Analysis
**Commit Context:**
- Upstream commit: d87208128a3330c0eab18301ab39bdb419647730 (August 14,
2025)
- Author: Nathan Chancellor
- Part of patch series: "x86-min-ver-cleanups-v1"
- Already backported to 6.17 stable as 8be33f616f1c4 via AUTOSEL
(Automatic Stable Election)
- Target tree: linux-autosel-6.17 (kernel 6.17)
**What the Commit Does:**
The commit removes runtime compiler capability checks (`cc-option`) for
stack alignment flags and replaces them with build-time Kconfig checks:
- For GCC: Uses `CONFIG_CC_IS_GCC` to unconditionally set `-mpreferred-
stack-boundary=2/3`
- For Clang: Uses `CONFIG_CC_IS_CLANG` to unconditionally set `-mstack-
alignment=4/8`
**Code Changes Analysis:**
```makefile
# OLD: Runtime check if compiler supports the flags
-ifneq ($(call cc-option, -mpreferred-stack-boundary=4),)
+ifdef CONFIG_CC_IS_GCC
cc_stack_align4 := -mpreferred-stack-boundary=2
cc_stack_align8 := -mpreferred-stack-boundary=3
-else ifneq ($(call cc-option, -mstack-alignment=16),)
+endif
+ifdef CONFIG_CC_IS_CLANG
cc_stack_align4 := -mstack-alignment=4
cc_stack_align8 := -mstack-alignment=8
endif
```
**Dependency Analysis:**
- Requires minimum GCC 8.1 for x86 (introduced in v6.15 via commit
a3e8fe814ad1)
- Requires minimum Clang 15.0.0 for x86 (commit 7861640aac52b)
- Both requirements are satisfied in 6.17 stable tree (verified via
scripts/min-tool-version.sh)
- GCC 7.1+ supports `-mpreferred-stack-boundary=3` with `-msse` (per GCC
commit 34fac449e121)
**Evaluation Against Stable Kernel Rules:**
According to Documentation/process/stable-kernel-rules.rst, stable
patches must:
1. ✅ **Already exist in mainline**: YES -
d87208128a3330c0eab18301ab39bdb419647730
2. ✅ **Obviously correct and tested**: YES - simple Makefile change, no
issues found
3. ✅ **Not bigger than 100 lines**: YES - only 5 lines changed (3
insertions, 2 deletions)
4. ✅ **Follow submitting-patches.rst rules**: YES
5. ❌ **Fix a real bug or add device ID**: **NO - This is the critical
failure**
The rules explicitly state (lines 15-31 of stable-kernel-rules.rst):
> "It must either fix a real bug that bothers people or just add a
device ID."
This commit:
- Does **NOT** fix a bug (no oops, hang, data corruption, security
issue, build error, etc.)
- Is a **cleanup/optimization** to improve build performance
- Provides **no user-visible bug fix**
- Falls under "trivial fixes without benefit for users" category (rule
line 30-31)
- The original author did **NOT** tag it with `Cc:
stable(a)vger.kernel.org`
**Search for Issues/Regressions:**
- Searched Linux kernel mailing lists: No issues found
- Searched for reverts: None found
- Searched for build failures: None reported
- Part of systematic cleanup series with no reported problems
**Risk Assessment:**
- **Technical risk**: Very low - simple change, dependencies satisfied
- **Regression risk**: Very low - no functionality change, just build
system optimization
- **Policy compliance**: **Does not meet stable kernel criteria**
### Conclusion
While this commit is technically safe and provides a marginal build-time
performance improvement by eliminating unnecessary runtime compiler
checks, **it does not meet the fundamental requirement for stable kernel
backporting**: it does not fix a bug that affects users.
The commit is purely a cleanup that removes obsolete code after compiler
minimum version requirements were raised. Such cleanups belong in
mainline development, not stable trees, which should focus exclusively
on fixing bugs that impact users.
The fact that it was auto-selected by AUTOSEL does not override the
documented stable kernel rules. This commit should be **rejected** from
stable backporting or **reverted** if already applied.
arch/x86/Makefile | 5 +++--
1 file changed, 3 insertions(+), 2 deletions(-)
diff --git a/arch/x86/Makefile b/arch/x86/Makefile
index 1913d342969ba..7cfc1b31f17e1 100644
--- a/arch/x86/Makefile
+++ b/arch/x86/Makefile
@@ -37,10 +37,11 @@ export RETPOLINE_VDSO_CFLAGS
# For gcc stack alignment is specified with -mpreferred-stack-boundary,
# clang has the option -mstack-alignment for that purpose.
-ifneq ($(call cc-option, -mpreferred-stack-boundary=4),)
+ifdef CONFIG_CC_IS_GCC
cc_stack_align4 := -mpreferred-stack-boundary=2
cc_stack_align8 := -mpreferred-stack-boundary=3
-else ifneq ($(call cc-option, -mstack-alignment=16),)
+endif
+ifdef CONFIG_CC_IS_CLANG
cc_stack_align4 := -mstack-alignment=4
cc_stack_align8 := -mstack-alignment=8
endif
--
2.51.0
For idpf:
Milena fixes a memory leak in the idpf reset logic when the driver resets
with an outstanding Tx timestamp.
For ixgbe and ixgbevf:
Jedrzej fixes an issue with reporting link speed on E610 VFs.
Jedrzej also fixes the VF mailbox API incompatibilities caused by the
confusion with API v1.4, v1.5, and v1.6. The v1.4 API introduced IPSEC
offload, but this was only supported on Linux hosts. The v1.5 API
introduced a new mailbox API which is necessary to resolve issues on ESX
hosts. The v1.6 API introduced a new link management API for E610. Jedrzej
introduces a new v1.7 API with a feature negotiation which enables properly
checking if features such as IPSEC or the ESX mailbox APIs are supported.
This resolves issues with compatibility on different hosts, and aligns the
API across hosts instead of having Linux require custom mailbox API
versions for IPSEC offload.
Koichiro fixes a KASAN use-after-free bug in ixgbe_remove().
Signed-off-by: Jacob Keller <jacob.e.keller(a)intel.com>
---
Changes in v2:
- Drop Emil's idpf_vport_open race fix for now.
- Add my signature.
- Link to v1: https://lore.kernel.org/r/20251001-jk-iwl-net-2025-10-01-v1-0-49fa99e86600@…
---
Jedrzej Jagielski (4):
ixgbevf: fix getting link speed data for E610 devices
ixgbe: handle IXGBE_VF_GET_PF_LINK_STATE mailbox operation
ixgbevf: fix mailbox API compatibility by negotiating supported features
ixgbe: handle IXGBE_VF_FEATURES_NEGOTIATE mbox cmd
Koichiro Den (1):
ixgbe: fix too early devlink_free() in ixgbe_remove()
Milena Olech (1):
idpf: cleanup remaining SKBs in PTP flows
drivers/net/ethernet/intel/ixgbe/ixgbe_mbx.h | 15 ++
drivers/net/ethernet/intel/ixgbevf/defines.h | 1 +
drivers/net/ethernet/intel/ixgbevf/ixgbevf.h | 7 +
drivers/net/ethernet/intel/ixgbevf/mbx.h | 8 +
drivers/net/ethernet/intel/ixgbevf/vf.h | 1 +
drivers/net/ethernet/intel/idpf/idpf_ptp.c | 3 +
.../net/ethernet/intel/idpf/idpf_virtchnl_ptp.c | 1 +
drivers/net/ethernet/intel/ixgbe/ixgbe_main.c | 3 +-
drivers/net/ethernet/intel/ixgbe/ixgbe_sriov.c | 79 +++++++++
drivers/net/ethernet/intel/ixgbevf/ipsec.c | 10 ++
drivers/net/ethernet/intel/ixgbevf/ixgbevf_main.c | 34 +++-
drivers/net/ethernet/intel/ixgbevf/vf.c | 182 +++++++++++++++++----
12 files changed, 310 insertions(+), 34 deletions(-)
---
base-commit: daa26ea63c6f848159821cd9b3cbe47cddbb0a1c
change-id: 20251001-jk-iwl-net-2025-10-01-92cd2a626ff7
Best regards,
--
Jacob Keller <jacob.e.keller(a)intel.com>
Helge reported that the introduction of PP_MAGIC_MASK let to crashes on
boot on his 32-bit parisc machine. The cause of this is the mask is set
too wide, so the page_pool_page_is_pp() incurs false positives which
crashes the machine.
Just disabling the check in page_pool_is_pp() will lead to the page_pool
code itself malfunctioning; so instead of doing this, this patch changes
the define for PP_DMA_INDEX_BITS to avoid mistaking arbitrary kernel
pointers for page_pool-tagged pages.
The fix relies on the kernel pointers that alias with the pp_magic field
always being above PAGE_OFFSET. With this assumption, we can use the
lowest bit of the value of PAGE_OFFSET as the upper bound of the
PP_DMA_INDEX_MASK, which should avoid the false positives.
Because we cannot rely on PAGE_OFFSET always being a compile-time
constant, nor on it always being >0, we fall back to disabling the
dma_index storage when there are not enough bits available. This leaves
us in the situation we were in before the patch in the Fixes tag, but
only on a subset of architecture configurations. This seems to be the
best we can do until the transition to page types in complete for
page_pool pages.
v2:
- Make sure there's at least 8 bits available and that the PAGE_OFFSET
bit calculation doesn't wrap
Link: https://lore.kernel.org/all/aMNJMFa5fDalFmtn@p100/
Fixes: ee62ce7a1d90 ("page_pool: Track DMA-mapped pages and unmap them when destroying the pool")
Cc: stable(a)vger.kernel.org # 6.15+
Tested-by: Helge Deller <deller(a)gmx.de>
Signed-off-by: Toke Høiland-Jørgensen <toke(a)redhat.com>
---
include/linux/mm.h | 22 +++++++------
net/core/page_pool.c | 76 ++++++++++++++++++++++++++++++--------------
2 files changed, 66 insertions(+), 32 deletions(-)
diff --git a/include/linux/mm.h b/include/linux/mm.h
index 1ae97a0b8ec7..0905eb6b55ec 100644
--- a/include/linux/mm.h
+++ b/include/linux/mm.h
@@ -4159,14 +4159,13 @@ int arch_lock_shadow_stack_status(struct task_struct *t, unsigned long status);
* since this value becomes part of PP_SIGNATURE; meaning we can just use the
* space between the PP_SIGNATURE value (without POISON_POINTER_DELTA), and the
* lowest bits of POISON_POINTER_DELTA. On arches where POISON_POINTER_DELTA is
- * 0, we make sure that we leave the two topmost bits empty, as that guarantees
- * we won't mistake a valid kernel pointer for a value we set, regardless of the
- * VMSPLIT setting.
+ * 0, we use the lowest bit of PAGE_OFFSET as the boundary if that value is
+ * known at compile-time.
*
- * Altogether, this means that the number of bits available is constrained by
- * the size of an unsigned long (at the upper end, subtracting two bits per the
- * above), and the definition of PP_SIGNATURE (with or without
- * POISON_POINTER_DELTA).
+ * If the value of PAGE_OFFSET is not known at compile time, or if it is too
+ * small to leave at least 8 bits available above PP_SIGNATURE, we define the
+ * number of bits to be 0, which turns off the DMA index tracking altogether
+ * (see page_pool_register_dma_index()).
*/
#define PP_DMA_INDEX_SHIFT (1 + __fls(PP_SIGNATURE - POISON_POINTER_DELTA))
#if POISON_POINTER_DELTA > 0
@@ -4175,8 +4174,13 @@ int arch_lock_shadow_stack_status(struct task_struct *t, unsigned long status);
*/
#define PP_DMA_INDEX_BITS MIN(32, __ffs(POISON_POINTER_DELTA) - PP_DMA_INDEX_SHIFT)
#else
-/* Always leave out the topmost two; see above. */
-#define PP_DMA_INDEX_BITS MIN(32, BITS_PER_LONG - PP_DMA_INDEX_SHIFT - 2)
+/* Use the lowest bit of PAGE_OFFSET if there's at least 8 bits available; see above */
+#define PP_DMA_INDEX_MIN_OFFSET (1 << (PP_DMA_INDEX_SHIFT + 8))
+#define PP_DMA_INDEX_BITS ((__builtin_constant_p(PAGE_OFFSET) && \
+ PAGE_OFFSET >= PP_DMA_INDEX_MIN_OFFSET && \
+ !(PAGE_OFFSET & (PP_DMA_INDEX_MIN_OFFSET - 1))) ? \
+ MIN(32, __ffs(PAGE_OFFSET) - PP_DMA_INDEX_SHIFT) : 0)
+
#endif
#define PP_DMA_INDEX_MASK GENMASK(PP_DMA_INDEX_BITS + PP_DMA_INDEX_SHIFT - 1, \
diff --git a/net/core/page_pool.c b/net/core/page_pool.c
index 492728f9e021..1a5edec485f1 100644
--- a/net/core/page_pool.c
+++ b/net/core/page_pool.c
@@ -468,11 +468,60 @@ page_pool_dma_sync_for_device(const struct page_pool *pool,
}
}
+static int page_pool_register_dma_index(struct page_pool *pool,
+ netmem_ref netmem, gfp_t gfp)
+{
+ int err = 0;
+ u32 id;
+
+ if (unlikely(!PP_DMA_INDEX_BITS))
+ goto out;
+
+ if (in_softirq())
+ err = xa_alloc(&pool->dma_mapped, &id, netmem_to_page(netmem),
+ PP_DMA_INDEX_LIMIT, gfp);
+ else
+ err = xa_alloc_bh(&pool->dma_mapped, &id, netmem_to_page(netmem),
+ PP_DMA_INDEX_LIMIT, gfp);
+ if (err) {
+ WARN_ONCE(err != -ENOMEM, "couldn't track DMA mapping, please report to netdev@");
+ goto out;
+ }
+
+ netmem_set_dma_index(netmem, id);
+out:
+ return err;
+}
+
+static int page_pool_release_dma_index(struct page_pool *pool,
+ netmem_ref netmem)
+{
+ struct page *old, *page = netmem_to_page(netmem);
+ unsigned long id;
+
+ if (unlikely(!PP_DMA_INDEX_BITS))
+ return 0;
+
+ id = netmem_get_dma_index(netmem);
+ if (!id)
+ return -1;
+
+ if (in_softirq())
+ old = xa_cmpxchg(&pool->dma_mapped, id, page, NULL, 0);
+ else
+ old = xa_cmpxchg_bh(&pool->dma_mapped, id, page, NULL, 0);
+ if (old != page)
+ return -1;
+
+ netmem_set_dma_index(netmem, 0);
+
+ return 0;
+}
+
static bool page_pool_dma_map(struct page_pool *pool, netmem_ref netmem, gfp_t gfp)
{
dma_addr_t dma;
int err;
- u32 id;
/* Setup DMA mapping: use 'struct page' area for storing DMA-addr
* since dma_addr_t can be either 32 or 64 bits and does not always fit
@@ -491,18 +540,10 @@ static bool page_pool_dma_map(struct page_pool *pool, netmem_ref netmem, gfp_t g
goto unmap_failed;
}
- if (in_softirq())
- err = xa_alloc(&pool->dma_mapped, &id, netmem_to_page(netmem),
- PP_DMA_INDEX_LIMIT, gfp);
- else
- err = xa_alloc_bh(&pool->dma_mapped, &id, netmem_to_page(netmem),
- PP_DMA_INDEX_LIMIT, gfp);
- if (err) {
- WARN_ONCE(err != -ENOMEM, "couldn't track DMA mapping, please report to netdev@");
+ err = page_pool_register_dma_index(pool, netmem, gfp);
+ if (err)
goto unset_failed;
- }
- netmem_set_dma_index(netmem, id);
page_pool_dma_sync_for_device(pool, netmem, pool->p.max_len);
return true;
@@ -680,8 +721,6 @@ void page_pool_clear_pp_info(netmem_ref netmem)
static __always_inline void __page_pool_release_netmem_dma(struct page_pool *pool,
netmem_ref netmem)
{
- struct page *old, *page = netmem_to_page(netmem);
- unsigned long id;
dma_addr_t dma;
if (!pool->dma_map)
@@ -690,15 +729,7 @@ static __always_inline void __page_pool_release_netmem_dma(struct page_pool *poo
*/
return;
- id = netmem_get_dma_index(netmem);
- if (!id)
- return;
-
- if (in_softirq())
- old = xa_cmpxchg(&pool->dma_mapped, id, page, NULL, 0);
- else
- old = xa_cmpxchg_bh(&pool->dma_mapped, id, page, NULL, 0);
- if (old != page)
+ if (page_pool_release_dma_index(pool, netmem))
return;
dma = page_pool_get_dma_addr_netmem(netmem);
@@ -708,7 +739,6 @@ static __always_inline void __page_pool_release_netmem_dma(struct page_pool *poo
PAGE_SIZE << pool->p.order, pool->p.dma_dir,
DMA_ATTR_SKIP_CPU_SYNC | DMA_ATTR_WEAK_ORDERING);
page_pool_set_dma_addr_netmem(netmem, 0);
- netmem_set_dma_index(netmem, 0);
}
/* Disconnects a page (from a page_pool). API users can have a need
--
2.51.0
The commit
8c493cc91f3a ("PCI/pwrctrl: Create pwrctrl devices only when CONFIG_PCI_PWRCTRL is enabled")
introduced a typo, it uses CONFIG_PCI_PWRCTRL while the correct symbol
is CONFIG_PCI_PWRCTL. As reported by Daniel Martin, it causes device
initialization failures on some arm boards.
I encountered it on sm8250-xiaomi-pipa after rebasing from v6.15.8
to v6.15.11, with the following error:
[ 6.035321] pcieport 0000:00:00.0: Failed to create device link (0x180) with supplier qca6390-pmu for /soc@0/pcie@1c00000/pcie@0/wifi@0
Fix the typo to use the correct CONFIG_PCI_PWRCTL symbol.
Fixes: 8c493cc91f3a ("PCI/pwrctrl: Create pwrctrl devices only when CONFIG_PCI_PWRCTRL is enabled")
Cc: stable(a)vger.kernel.org
Reported-by: Daniel Martin <dmanlfc(a)gmail.com>
Closes: https://lore.kernel.org/linux-pci/2025081053-expectant-observant-6268@gregk…
Signed-off-by: Victor Paul <vipoll(a)mainlining.org>
---
drivers/pci/probe.c | 2 +-
1 file changed, 1 insertion(+), 1 deletion(-)
diff --git a/drivers/pci/probe.c b/drivers/pci/probe.c
index 19010c382864..7e97e33b3fb5 100644
--- a/drivers/pci/probe.c
+++ b/drivers/pci/probe.c
@@ -2508,7 +2508,7 @@ bool pci_bus_read_dev_vendor_id(struct pci_bus *bus, int devfn, u32 *l,
}
EXPORT_SYMBOL(pci_bus_read_dev_vendor_id);
-#if IS_ENABLED(CONFIG_PCI_PWRCTRL)
+#if IS_ENABLED(CONFIG_PCI_PWRCTL)
static struct platform_device *pci_pwrctrl_create_device(struct pci_bus *bus, int devfn)
{
struct pci_host_bridge *host = pci_find_host_bridge(bus);
--
2.51.0
Hi,
I would like to request backporting 5326ab737a47 ("virtio_console: fix
order of fields cols and rows") to all LTS kernels.
I'm working on QEMU patches that add virtio console size support.
Without the fix, rows and columns will be swapped.
As far as I know, there are no device implementations that use the
wrong order and would by broken by the fix.
Note: A previous version [1] of the patch contained "Cc: stable" and
"Fixes:" tags, but they seem to have been accidentally left out from
the final version.
[1]: https://lore.kernel.org/all/20250320172654.624657-1-maxbr@linux.ibm.com/
Thanks,
Filip Hejsek
rtla-timerlat allows a *thread* latency threshold to be set via the
-T/--thread option. However, the timerlat tracer calls this *total*
latency (stop_tracing_total_us), and stops tracing also when the
return-to-user latency is over the threshold.
Change the behavior of the timerlat BPF program to reflect what the
timerlat tracer is doing, to avoid discrepancy between stopping
collecting data in the BPF program and stopping tracing in the timerlat
tracer.
Cc: stable(a)vger.kernel.org
Fixes: e34293ddcebd ("rtla/timerlat: Add BPF skeleton to collect samples")
Signed-off-by: Tomas Glozar <tglozar(a)redhat.com>
---
tools/tracing/rtla/src/timerlat.bpf.c | 3 +++
1 file changed, 3 insertions(+)
diff --git a/tools/tracing/rtla/src/timerlat.bpf.c b/tools/tracing/rtla/src/timerlat.bpf.c
index 084cd10c21fc..e2265b5d6491 100644
--- a/tools/tracing/rtla/src/timerlat.bpf.c
+++ b/tools/tracing/rtla/src/timerlat.bpf.c
@@ -148,6 +148,9 @@ int handle_timerlat_sample(struct trace_event_raw_timerlat_sample *tp_args)
} else {
update_main_hist(&hist_user, bucket);
update_summary(&summary_user, latency, bucket);
+
+ if (thread_threshold != 0 && latency_us >= thread_threshold)
+ set_stop_tracing();
}
return 0;
--
2.51.0
From: Hugo Villeneuve <hvilleneuve(a)dimonoff.com>
Commit 43c51bb573aa ("sc16is7xx: make sure device is in suspend once
probed") permanently enabled access to the enhanced features in
sc16is7xx_probe(), and it is never disabled after that.
Therefore, remove re-enable of enhanced features in
sc16is7xx_set_baud(). This eliminates a potential useless read + write
cycle each time the baud rate is reconfigured.
Fixes: 43c51bb573aa ("sc16is7xx: make sure device is in suspend once probed")
Cc: stable(a)vger.kernel.org
Signed-off-by: Hugo Villeneuve <hvilleneuve(a)dimonoff.com>
---
This patch was originally part of this series:
https://lore.kernel.org/linux-serial/20251002145738.3250272-1-hugo@hugovil.…
and it is now separate as suggested by Greg to facilitate stable backporting.
---
drivers/tty/serial/sc16is7xx.c | 7 -------
1 file changed, 7 deletions(-)
diff --git a/drivers/tty/serial/sc16is7xx.c b/drivers/tty/serial/sc16is7xx.c
index 1a2c4c14f6aac..c7435595dce13 100644
--- a/drivers/tty/serial/sc16is7xx.c
+++ b/drivers/tty/serial/sc16is7xx.c
@@ -588,13 +588,6 @@ static int sc16is7xx_set_baud(struct uart_port *port, int baud)
div /= prescaler;
}
- /* Enable enhanced features */
- sc16is7xx_efr_lock(port);
- sc16is7xx_port_update(port, SC16IS7XX_EFR_REG,
- SC16IS7XX_EFR_ENABLE_BIT,
- SC16IS7XX_EFR_ENABLE_BIT);
- sc16is7xx_efr_unlock(port);
-
/* If bit MCR_CLKSEL is set, the divide by 4 prescaler is activated. */
sc16is7xx_port_update(port, SC16IS7XX_MCR_REG,
SC16IS7XX_MCR_CLKSEL_BIT,
base-commit: fd94619c43360eb44d28bd3ef326a4f85c600a07
--
2.39.5
In a11f6ca9aef9 ("sunvdc: Do not spin in an infinite loop when vio_ldc_send()
returns EAGAIN"), a maximum retry count was added to __vdc_tx_trigger().
After this change, several users reported disk I/O errors when running Linux
inside a logical domain on Solaris 11.4:
[19095.192532] sunvdc: vdc_tx_trigger() failure, err=-11
[19095.192605] I/O error, dev vdiskc, sector 368208928 op 0x1:(WRITE) flags 0x1000 phys_seg 2 prio class 2
[19095.205681] XFS (vdiskc1): metadata I/O error in "xfs_buf_ioend+0x28c/0x600 [xfs]" at daddr 0x15f26420 len 32 error 5
[19432.043471] sunvdc: vdc_tx_trigger() failure, err=-11
[19432.043529] I/O error, dev vdiskc, sector 3732568 op 0x1:(WRITE) flags 0x1000 phys_seg 1 prio class 2
[19432.058821] sunvdc: vdc_tx_trigger() failure, err=-11
[19432.058843] I/O error, dev vdiskc, sector 3736256 op 0x1:(WRITE) flags 0x1000 phys_seg 4 prio class 2
[19432.074109] sunvdc: vdc_tx_trigger() failure, err=-11
[19432.074128] I/O error, dev vdiskc, sector 3736512 op 0x1:(WRITE) flags 0x1000 phys_seg 4 prio class 2
[19432.089425] sunvdc: vdc_tx_trigger() failure, err=-11
[19432.089443] I/O error, dev vdiskc, sector 3737024 op 0x1:(WRITE) flags 0x1000 phys_seg 1 prio class 2
[19432.100964] XFS (vdiskc1): metadata I/O error in "xfs_buf_ioend+0x28c/0x600 [xfs]" at daddr 0x38ec58 len 8 error 5
Since this change seems to have only been justified by reading the code which
becomes evident by the reference to adddc32d6fde ("sunvnet: Do not spin in an
infinite loop when vio_ldc_send() returns EAGAIN") in the commit message, it
can be safely assumed that the change was neither properly tested nor motivated
by any actual bug reports.
Thus, let's revert this change to address the disk I/O errors above.
Cc: stable(a)vger.kernel.org
Fixes: a11f6ca9aef9 ("sunvdc: Do not spin in an infinite loop when vio_ldc_send() returns EAGAIN")
Signed-off-by: John Paul Adrian Glaubitz <glaubitz(a)physik.fu-berlin.de>
---
Changes since v1:
- Rephrase commit message
Changes since v2:
- Add missing CC and Fixes tags
---
drivers/block/sunvdc.c | 5 -----
1 file changed, 5 deletions(-)
diff --git a/drivers/block/sunvdc.c b/drivers/block/sunvdc.c
index 282f81616a78..f56023c2b033 100644
--- a/drivers/block/sunvdc.c
+++ b/drivers/block/sunvdc.c
@@ -45,8 +45,6 @@ MODULE_VERSION(DRV_MODULE_VERSION);
#define WAITING_FOR_GEN_CMD 0x04
#define WAITING_FOR_ANY -1
-#define VDC_MAX_RETRIES 10
-
static struct workqueue_struct *sunvdc_wq;
struct vdc_req_entry {
@@ -437,7 +435,6 @@ static int __vdc_tx_trigger(struct vdc_port *port)
.end_idx = dr->prod,
};
int err, delay;
- int retries = 0;
hdr.seq = dr->snd_nxt;
delay = 1;
@@ -450,8 +447,6 @@ static int __vdc_tx_trigger(struct vdc_port *port)
udelay(delay);
if ((delay <<= 1) > 128)
delay = 128;
- if (retries++ > VDC_MAX_RETRIES)
- break;
} while (err == -EAGAIN);
if (err == -ENOTCONN)
--
2.47.3
The original code causes a circular locking dependency found by lockdep.
======================================================
WARNING: possible circular locking dependency detected
6.16.0-rc6-lgci-xe-xe-pw-151626v3+ #1 Tainted: G S U
------------------------------------------------------
xe_fault_inject/5091 is trying to acquire lock:
ffff888156815688 ((work_completion)(&(&devcd->del_wk)->work)){+.+.}-{0:0}, at: __flush_work+0x25d/0x660
but task is already holding lock:
ffff888156815620 (&devcd->mutex){+.+.}-{3:3}, at: dev_coredump_put+0x3f/0xa0
which lock already depends on the new lock.
the existing dependency chain (in reverse order) is:
-> #2 (&devcd->mutex){+.+.}-{3:3}:
mutex_lock_nested+0x4e/0xc0
devcd_data_write+0x27/0x90
sysfs_kf_bin_write+0x80/0xf0
kernfs_fop_write_iter+0x169/0x220
vfs_write+0x293/0x560
ksys_write+0x72/0xf0
__x64_sys_write+0x19/0x30
x64_sys_call+0x2bf/0x2660
do_syscall_64+0x93/0xb60
entry_SYSCALL_64_after_hwframe+0x76/0x7e
-> #1 (kn->active#236){++++}-{0:0}:
kernfs_drain+0x1e2/0x200
__kernfs_remove+0xae/0x400
kernfs_remove_by_name_ns+0x5d/0xc0
remove_files+0x54/0x70
sysfs_remove_group+0x3d/0xa0
sysfs_remove_groups+0x2e/0x60
device_remove_attrs+0xc7/0x100
device_del+0x15d/0x3b0
devcd_del+0x19/0x30
process_one_work+0x22b/0x6f0
worker_thread+0x1e8/0x3d0
kthread+0x11c/0x250
ret_from_fork+0x26c/0x2e0
ret_from_fork_asm+0x1a/0x30
-> #0 ((work_completion)(&(&devcd->del_wk)->work)){+.+.}-{0:0}:
__lock_acquire+0x1661/0x2860
lock_acquire+0xc4/0x2f0
__flush_work+0x27a/0x660
flush_delayed_work+0x5d/0xa0
dev_coredump_put+0x63/0xa0
xe_driver_devcoredump_fini+0x12/0x20 [xe]
devm_action_release+0x12/0x30
release_nodes+0x3a/0x120
devres_release_all+0x8a/0xd0
device_unbind_cleanup+0x12/0x80
device_release_driver_internal+0x23a/0x280
device_driver_detach+0x14/0x20
unbind_store+0xaf/0xc0
drv_attr_store+0x21/0x50
sysfs_kf_write+0x4a/0x80
kernfs_fop_write_iter+0x169/0x220
vfs_write+0x293/0x560
ksys_write+0x72/0xf0
__x64_sys_write+0x19/0x30
x64_sys_call+0x2bf/0x2660
do_syscall_64+0x93/0xb60
entry_SYSCALL_64_after_hwframe+0x76/0x7e
other info that might help us debug this:
Chain exists of: (work_completion)(&(&devcd->del_wk)->work) --> kn->active#236 --> &devcd->mutex
Possible unsafe locking scenario:
CPU0 CPU1
---- ----
lock(&devcd->mutex);
lock(kn->active#236);
lock(&devcd->mutex);
lock((work_completion)(&(&devcd->del_wk)->work));
*** DEADLOCK ***
5 locks held by xe_fault_inject/5091:
#0: ffff8881129f9488 (sb_writers#5){.+.+}-{0:0}, at: ksys_write+0x72/0xf0
#1: ffff88810c755078 (&of->mutex#2){+.+.}-{3:3}, at: kernfs_fop_write_iter+0x123/0x220
#2: ffff8881054811a0 (&dev->mutex){....}-{3:3}, at: device_release_driver_internal+0x55/0x280
#3: ffff888156815620 (&devcd->mutex){+.+.}-{3:3}, at: dev_coredump_put+0x3f/0xa0
#4: ffffffff8359e020 (rcu_read_lock){....}-{1:2}, at: __flush_work+0x72/0x660
stack backtrace:
CPU: 14 UID: 0 PID: 5091 Comm: xe_fault_inject Tainted: G S U 6.16.0-rc6-lgci-xe-xe-pw-151626v3+ #1 PREEMPT_{RT,(lazy)}
Tainted: [S]=CPU_OUT_OF_SPEC, [U]=USER
Hardware name: Micro-Star International Co., Ltd. MS-7D25/PRO Z690-A DDR4(MS-7D25), BIOS 1.10 12/13/2021
Call Trace:
<TASK>
dump_stack_lvl+0x91/0xf0
dump_stack+0x10/0x20
print_circular_bug+0x285/0x360
check_noncircular+0x135/0x150
? register_lock_class+0x48/0x4a0
__lock_acquire+0x1661/0x2860
lock_acquire+0xc4/0x2f0
? __flush_work+0x25d/0x660
? mark_held_locks+0x46/0x90
? __flush_work+0x25d/0x660
__flush_work+0x27a/0x660
? __flush_work+0x25d/0x660
? trace_hardirqs_on+0x1e/0xd0
? __pfx_wq_barrier_func+0x10/0x10
flush_delayed_work+0x5d/0xa0
dev_coredump_put+0x63/0xa0
xe_driver_devcoredump_fini+0x12/0x20 [xe]
devm_action_release+0x12/0x30
release_nodes+0x3a/0x120
devres_release_all+0x8a/0xd0
device_unbind_cleanup+0x12/0x80
device_release_driver_internal+0x23a/0x280
? bus_find_device+0xa8/0xe0
device_driver_detach+0x14/0x20
unbind_store+0xaf/0xc0
drv_attr_store+0x21/0x50
sysfs_kf_write+0x4a/0x80
kernfs_fop_write_iter+0x169/0x220
vfs_write+0x293/0x560
ksys_write+0x72/0xf0
__x64_sys_write+0x19/0x30
x64_sys_call+0x2bf/0x2660
do_syscall_64+0x93/0xb60
? __f_unlock_pos+0x15/0x20
? __x64_sys_getdents64+0x9b/0x130
? __pfx_filldir64+0x10/0x10
? do_syscall_64+0x1a2/0xb60
? clear_bhb_loop+0x30/0x80
? clear_bhb_loop+0x30/0x80
entry_SYSCALL_64_after_hwframe+0x76/0x7e
RIP: 0033:0x76e292edd574
Code: c7 00 16 00 00 00 b8 ff ff ff ff c3 66 2e 0f 1f 84 00 00 00 00 00 f3 0f 1e fa 80 3d d5 ea 0e 00 00 74 13 b8 01 00 00 00 0f 05 <48> 3d 00 f0 ff ff 77 54 c3 0f 1f 00 55 48 89 e5 48 83 ec 20 48 89
RSP: 002b:00007fffe247a828 EFLAGS: 00000202 ORIG_RAX: 0000000000000001
RAX: ffffffffffffffda RBX: 0000000000000000 RCX: 000076e292edd574
RDX: 000000000000000c RSI: 00006267f6306063 RDI: 000000000000000b
RBP: 000000000000000c R08: 000076e292fc4b20 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000202 R12: 00006267f6306063
R13: 000000000000000b R14: 00006267e6859c00 R15: 000076e29322a000
</TASK>
xe 0000:03:00.0: [drm] Xe device coredump has been deleted.
Fixes: 01daccf74832 ("devcoredump : Serialize devcd_del work")
Cc: Mukesh Ojha <quic_mojha(a)quicinc.com>
Cc: Greg Kroah-Hartman <gregkh(a)linuxfoundation.org>
Cc: Johannes Berg <johannes(a)sipsolutions.net>
Cc: "Rafael J. Wysocki" <rafael(a)kernel.org>
Cc: Danilo Krummrich <dakr(a)kernel.org>
Cc: linux-kernel(a)vger.kernel.org
Cc: <stable(a)vger.kernel.org> # v6.1+
Signed-off-by: Maarten Lankhorst <dev(a)lankhorst.se>
Cc: Matthew Brost <matthew.brost(a)intel.com>
---
drivers/base/devcoredump.c | 136 ++++++++++++++++++++++---------------
1 file changed, 83 insertions(+), 53 deletions(-)
diff --git a/drivers/base/devcoredump.c b/drivers/base/devcoredump.c
index 03a39c417dc41..ad4bddde12ccb 100644
--- a/drivers/base/devcoredump.c
+++ b/drivers/base/devcoredump.c
@@ -23,50 +23,46 @@ struct devcd_entry {
void *data;
size_t datalen;
/*
- * Here, mutex is required to serialize the calls to del_wk work between
- * user/kernel space which happens when devcd is added with device_add()
- * and that sends uevent to user space. User space reads the uevents,
- * and calls to devcd_data_write() which try to modify the work which is
- * not even initialized/queued from devcoredump.
+ * There are 2 races for which mutex is required.
*
+ * The first race is between device creation and userspace writing to
+ * schedule immediately destruction.
*
+ * This race is handled by arming the timer before device creation, but
+ * when device creation fails the timer still exists.
*
- * cpu0(X) cpu1(Y)
+ * To solve this, hold the mutex during device_add(), and set
+ * init_completed on success before releasing the mutex.
*
- * dev_coredump() uevent sent to user space
- * device_add() ======================> user space process Y reads the
- * uevents writes to devcd fd
- * which results into writes to
+ * That way the timer will never fire until device_add() is called,
+ * it will do nothing if init_completed is not set. The timer is also
+ * cancelled in that case.
*
- * devcd_data_write()
- * mod_delayed_work()
- * try_to_grab_pending()
- * timer_delete()
- * debug_assert_init()
- * INIT_DELAYED_WORK()
- * schedule_delayed_work()
- *
- *
- * Also, mutex alone would not be enough to avoid scheduling of
- * del_wk work after it get flush from a call to devcd_free()
- * mentioned as below.
- *
- * disabled_store()
- * devcd_free()
- * mutex_lock() devcd_data_write()
- * flush_delayed_work()
- * mutex_unlock()
- * mutex_lock()
- * mod_delayed_work()
- * mutex_unlock()
- * So, delete_work flag is required.
+ * The second race involves multiple parallel invocations of devcd_free(),
+ * add a deleted flag so only 1 can call the destructor.
*/
struct mutex mutex;
- bool delete_work;
+ bool init_completed, deleted;
struct module *owner;
ssize_t (*read)(char *buffer, loff_t offset, size_t count,
void *data, size_t datalen);
void (*free)(void *data);
+ /*
+ * If nothing interferes and device_add() was returns success,
+ * del_wk will destroy the device after the timer fires.
+ *
+ * Multiple userspace processes can interfere in the working of the timer:
+ * - Writing to the coredump will reschedule the timer to run immediately,
+ * if still armed.
+ *
+ * This is handled by using "if (cancel_delayed_work()) {
+ * schedule_delayed_work() }", to prevent re-arming after having
+ * been previously fired.
+ * - Writing to /sys/class/devcoredump/disabled will destroy the
+ * coredump synchronously.
+ * This is handled by using disable_delayed_work_sync(), and then
+ * checking if deleted flag is set with &devcd->mutex held.
+ */
struct delayed_work del_wk;
struct device *failing_dev;
};
@@ -95,14 +91,27 @@ static void devcd_dev_release(struct device *dev)
kfree(devcd);
}
+static void __devcd_del(struct devcd_entry *devcd)
+{
+ devcd->deleted = true;
+ device_del(&devcd->devcd_dev);
+ put_device(&devcd->devcd_dev);
+}
+
static void devcd_del(struct work_struct *wk)
{
struct devcd_entry *devcd;
+ bool init_completed;
devcd = container_of(wk, struct devcd_entry, del_wk.work);
- device_del(&devcd->devcd_dev);
- put_device(&devcd->devcd_dev);
+ /* devcd->mutex serializes against dev_coredumpm_timeout */
+ mutex_lock(&devcd->mutex);
+ init_completed = devcd->init_completed;
+ mutex_unlock(&devcd->mutex);
+
+ if (init_completed)
+ __devcd_del(devcd);
}
static ssize_t devcd_data_read(struct file *filp, struct kobject *kobj,
@@ -122,12 +131,12 @@ static ssize_t devcd_data_write(struct file *filp, struct kobject *kobj,
struct device *dev = kobj_to_dev(kobj);
struct devcd_entry *devcd = dev_to_devcd(dev);
- mutex_lock(&devcd->mutex);
- if (!devcd->delete_work) {
- devcd->delete_work = true;
- mod_delayed_work(system_wq, &devcd->del_wk, 0);
- }
- mutex_unlock(&devcd->mutex);
+ /*
+ * Although it's tempting to use mod_delayed work here,
+ * that will cause a reschedule if the timer already fired.
+ */
+ if (cancel_delayed_work(&devcd->del_wk))
+ schedule_delayed_work(&devcd->del_wk, 0);
return count;
}
@@ -151,11 +160,21 @@ static int devcd_free(struct device *dev, void *data)
{
struct devcd_entry *devcd = dev_to_devcd(dev);
+ /*
+ * To prevent a race with devcd_data_write(), disable work and
+ * complete manually instead.
+ *
+ * We cannot rely on the return value of
+ * disable_delayed_work_sync() here, because it might be in the
+ * middle of a cancel_delayed_work + schedule_delayed_work pair.
+ *
+ * devcd->mutex here guards against multiple parallel invocations
+ * of devcd_free().
+ */
+ disable_delayed_work_sync(&devcd->del_wk);
mutex_lock(&devcd->mutex);
- if (!devcd->delete_work)
- devcd->delete_work = true;
-
- flush_delayed_work(&devcd->del_wk);
+ if (!devcd->deleted)
+ __devcd_del(devcd);
mutex_unlock(&devcd->mutex);
return 0;
}
@@ -179,12 +198,10 @@ static ssize_t disabled_show(const struct class *class, const struct class_attri
* put_device() <- last reference
* error = fn(dev, data) devcd_dev_release()
* devcd_free(dev, data) kfree(devcd)
- * mutex_lock(&devcd->mutex);
*
*
* In the above diagram, it looks like disabled_store() would be racing with parallelly
- * running devcd_del() and result in memory abort while acquiring devcd->mutex which
- * is called after kfree of devcd memory after dropping its last reference with
+ * running devcd_del() and result in memory abort after dropping its last reference with
* put_device(). However, this will not happens as fn(dev, data) runs
* with its own reference to device via klist_node so it is not its last reference.
* so, above situation would not occur.
@@ -374,7 +391,7 @@ void dev_coredumpm_timeout(struct device *dev, struct module *owner,
devcd->read = read;
devcd->free = free;
devcd->failing_dev = get_device(dev);
- devcd->delete_work = false;
+ devcd->deleted = false;
mutex_init(&devcd->mutex);
device_initialize(&devcd->devcd_dev);
@@ -383,8 +400,14 @@ void dev_coredumpm_timeout(struct device *dev, struct module *owner,
atomic_inc_return(&devcd_count));
devcd->devcd_dev.class = &devcd_class;
- mutex_lock(&devcd->mutex);
dev_set_uevent_suppress(&devcd->devcd_dev, true);
+
+ /* devcd->mutex prevents devcd_del() completing until init finishes */
+ mutex_lock(&devcd->mutex);
+ devcd->init_completed = false;
+ INIT_DELAYED_WORK(&devcd->del_wk, devcd_del);
+ schedule_delayed_work(&devcd->del_wk, timeout);
+
if (device_add(&devcd->devcd_dev))
goto put_device;
@@ -401,13 +424,20 @@ void dev_coredumpm_timeout(struct device *dev, struct module *owner,
dev_set_uevent_suppress(&devcd->devcd_dev, false);
kobject_uevent(&devcd->devcd_dev.kobj, KOBJ_ADD);
- INIT_DELAYED_WORK(&devcd->del_wk, devcd_del);
- schedule_delayed_work(&devcd->del_wk, timeout);
+
+ /*
+ * Safe to run devcd_del() now that we are done with devcd_dev.
+ * Alternatively we could have taken a ref on devcd_dev before
+ * dropping the lock.
+ */
+ devcd->init_completed = true;
mutex_unlock(&devcd->mutex);
return;
put_device:
- put_device(&devcd->devcd_dev);
mutex_unlock(&devcd->mutex);
+ cancel_delayed_work_sync(&devcd->del_wk);
+ put_device(&devcd->devcd_dev);
+
put_module:
module_put(owner);
free:
--
2.45.2
Hi. This is supposed to be a patch, but I think it's worth discussing
how it should be backported to -stable, so I've labeled it as [DISCUSSION].
The bug described below was unintentionally fixed in v6.5 and not
backported to -stable. So technically I would need to use "Option 3" [A],
but since the original patch [B] did not intend to fix a bug (and it's also
part of a larger patch series), it looks quite different from the patch below,
and I'm not sure what the backport should look like.
I think there are probably two options:
1. Provide the description of the original patch along with a very long,
detailed explanation of why the patch deviates from the upstream version, or
2. Post the patch below with a clarification that it was fixed upstream
by commit 670ddd8cdcbd1.
Any thoughts?
[A] https://www.kernel.org/doc/html/latest/process/stable-kernel-rules.html#opt…
[B] https://lkml.kernel.org/r/725a42a9-91e9-c868-925-e3a5fd40bb4f@google.com
(Upstream commit 670ddd8cdcbd1)
In any case, no matter how we backport this, it needs some review and
feedback would be appreciated. The patch applies to v6.1 and v5.15, and
v5.10 but not v5.4.
From cf45867ab8e48b42160b7253390db7bdecef1455 Mon Sep 17 00:00:00 2001
From: Harry Yoo <harry.yoo(a)oracle.com>
Date: Thu, 11 Sep 2025 20:05:40 +0900
Subject: [PATCH] mm, numa: fix bad pmd by atomically checking is_swap_pmd() in
change_prot_numa()
It was observed that a bad pmd is seen when automatic NUMA balancing
is marking page table entries as prot_numa:
[2437548.196018] mm/pgtable-generic.c:50: bad pmd 00000000af22fc02(dffffffe71fbfe02)
With some kernel modification, the call stack was dumped:
[2437548.235022] Call Trace:
[2437548.238234] <TASK>
[2437548.241060] dump_stack_lvl+0x46/0x61
[2437548.245689] panic+0x106/0x2e5
[2437548.249497] pmd_clear_bad+0x3c/0x3c
[2437548.253967] change_pmd_range.isra.0+0x34d/0x3a7
[2437548.259537] change_p4d_range+0x156/0x20e
[2437548.264392] change_protection_range+0x116/0x1a9
[2437548.269976] change_prot_numa+0x15/0x37
[2437548.274774] task_numa_work+0x1b8/0x302
[2437548.279512] task_work_run+0x62/0x95
[2437548.283882] exit_to_user_mode_loop+0x1a4/0x1a9
[2437548.289277] exit_to_user_mode_prepare+0xf4/0xfc
[2437548.294751] ? sysvec_apic_timer_interrupt+0x34/0x81
[2437548.300677] irqentry_exit_to_user_mode+0x5/0x25
[2437548.306153] asm_sysvec_apic_timer_interrupt+0x16/0x1b
This is due to a race condition between change_prot_numa() and
THP migration because the kernel doesn't check is_swap_pmd() and
pmd_trans_huge() atomically:
change_prot_numa() THP migration
======================================================================
- change_pmd_range()
-> is_swap_pmd() returns false,
meaning it's not a PMD migration
entry.
- do_huge_pmd_numa_page()
-> migrate_misplaced_page() sets
migration entries for the THP.
- change_pmd_range()
-> pmd_none_or_clear_bad_unless_trans_huge()
-> pmd_none() and pmd_trans_huge() returns false
- pmd_none_or_clear_bad_unless_trans_huge()
-> pmd_bad() returns true for the migration entry!
For the race condition described above to occur:
1) AutoNUMA must be unmapping a range of pages, with at least part of the
range already unmapped by AutoNUMA.
2) While AutoNUMA is in the process of unmapping, a NUMA hinting fault
occurs within that range, specifically when we are about to unmap
the PMD entry, between the is_swap_pmd() and pmd_trans_huge() checks.
So this is a really rare race condition and it's observed that it takes
usually a few days of autonuma-intensive testing to trigger.
A bit of history on a similar race condition in the past:
In fact, a similar race condition caused by not checking pmd_trans_huge()
atomically was reported [1] in 2017. However, instead of the patch [1],
another patch series [3] fixed the problem [2] by not clearing the pmd
entry but invaliding it instead (so that pmd_trans_huge() would still
return true).
Despite patch series [3], the bad pmd error continued to be reported
in mainline. As a result, [1] was resurrected [4] and it landed mainline
in 2020 in a hope that it would resolve the issue. However, now it turns
out that [3] was not sufficient.
Fix this race condition by checking is_swap_pmd() and pmd_trans_huge()
atomically. With that, the kernel should see either
pmd_trans_huge() == true, or is_swap_pmd() == true when another task is
migrating the page concurrently.
This bug was introduced when THP migration support was added. More
specifically, by commit 84c3fc4e9c56 ("mm: thp: check pmd migration entry
in common path")).
It is unintentionally fixed since v6.5 by commit 670ddd8cdcbd1
("mm/mprotect: delete pmd_none_or_clear_bad_unless_trans_huge()") while
removing pmd_none_or_clear_bad_unless_trans_huge() function. But it's not
backported to -stable because it was fixed unintentionally.
Link: https://lore.kernel.org/linux-mm/20170410094825.2yfo5zehn7pchg6a@techsingul… [1]
Link: https://lore.kernel.org/linux-mm/8A6309F4-DB76-48FA-BE7F-BF9536A4C4E5@cs.ru… [2]
Link: https://lore.kernel.org/linux-mm/20170302151034.27829-1-kirill.shutemov@lin… [3]
Link: https://lore.kernel.org/linux-mm/20200216191800.22423-1-aquini@redhat.com [4]
Fixes: 84c3fc4e9c56 ("mm: thp: check pmd migration entry in common path")
Signed-off-by: Harry Yoo <harry.yoo(a)oracle.com>
---
mm/mprotect.c | 4 ++--
1 file changed, 2 insertions(+), 2 deletions(-)
diff --git a/mm/mprotect.c b/mm/mprotect.c
index 668bfaa6ed2a..c0e796c0f9b0 100644
--- a/mm/mprotect.c
+++ b/mm/mprotect.c
@@ -303,7 +303,7 @@ static inline int pmd_none_or_clear_bad_unless_trans_huge(pmd_t *pmd)
if (pmd_none(pmdval))
return 1;
- if (pmd_trans_huge(pmdval))
+ if (is_swap_pmd(pmdval) || pmd_trans_huge(pmdval))
return 0;
if (unlikely(pmd_bad(pmdval))) {
pmd_clear_bad(pmd);
@@ -373,7 +373,7 @@ static inline unsigned long change_pmd_range(struct mmu_gather *tlb,
* Hence, it's necessary to atomically read the PMD value
* for all the checks.
*/
- if (!is_swap_pmd(*pmd) && !pmd_devmap(*pmd) &&
+ if (!pmd_devmap(*pmd) &&
pmd_none_or_clear_bad_unless_trans_huge(pmd))
goto next;
--
2.43.0
This is the start of the stable review cycle for the 6.6.110 release.
There are 7 patches in this series, all will be posted as a response
to this one. If anyone has any issues with these being applied, please
let me know.
Responses should be made by Sun, 05 Oct 2025 16:02:25 +0000.
Anything received after that time might be too late.
The whole patch series can be found in one patch at:
https://www.kernel.org/pub/linux/kernel/v6.x/stable-review/patch-6.6.110-rc…
or in the git tree and branch at:
git://git.kernel.org/pub/scm/linux/kernel/git/stable/linux-stable-rc.git linux-6.6.y
and the diffstat can be found below.
thanks,
greg k-h
-------------
Pseudo-Shortlog of commits:
Greg Kroah-Hartman <gregkh(a)linuxfoundation.org>
Linux 6.6.110-rc1
Srinivas Kandagatla <srinivas.kandagatla(a)oss.qualcomm.com>
ASoC: qcom: audioreach: fix potential null pointer dereference
Thadeu Lima de Souza Cascardo <cascardo(a)igalia.com>
media: uvcvideo: Mark invalid entities with id UVC_INVALID_ENTITY_ID
Larshin Sergey <Sergey.Larshin(a)kaspersky.com>
media: rc: fix races with imon_disconnect()
Duoming Zhou <duoming(a)zju.edu.cn>
media: b2c2: Fix use-after-free causing by irq_check_work in flexcop_pci_remove
Wang Haoran <haoranwangsec(a)gmail.com>
scsi: target: target_core_configfs: Add length check to avoid buffer overflow
Kees Cook <kees(a)kernel.org>
gcc-plugins: Remove TODO_verify_il for GCC >= 16
Breno Leitao <leitao(a)debian.org>
crypto: sha256 - fix crash at kexec
-------------
Diffstat:
Makefile | 4 +-
drivers/media/pci/b2c2/flexcop-pci.c | 2 +-
drivers/media/rc/imon.c | 27 +++++++++----
drivers/media/usb/uvc/uvc_driver.c | 73 ++++++++++++++++++++++-------------
drivers/media/usb/uvc/uvcvideo.h | 2 +
drivers/target/target_core_configfs.c | 2 +-
include/crypto/sha256_base.h | 2 +-
scripts/gcc-plugins/gcc-common.h | 7 ++++
sound/soc/qcom/qdsp6/topology.c | 4 +-
9 files changed, 82 insertions(+), 41 deletions(-)
This is the start of the stable review cycle for the 6.16.11 release.
There are 14 patches in this series, all will be posted as a response
to this one. If anyone has any issues with these being applied, please
let me know.
Responses should be made by Sun, 05 Oct 2025 16:02:25 +0000.
Anything received after that time might be too late.
The whole patch series can be found in one patch at:
https://www.kernel.org/pub/linux/kernel/v6.x/stable-review/patch-6.16.11-rc…
or in the git tree and branch at:
git://git.kernel.org/pub/scm/linux/kernel/git/stable/linux-stable-rc.git linux-6.16.y
and the diffstat can be found below.
thanks,
greg k-h
-------------
Pseudo-Shortlog of commits:
Greg Kroah-Hartman <gregkh(a)linuxfoundation.org>
Linux 6.16.11-rc1
Srinivas Kandagatla <srinivas.kandagatla(a)oss.qualcomm.com>
ASoC: qcom: audioreach: fix potential null pointer dereference
Chandra Mohan Sundar <chandramohan.explore(a)gmail.com>
media: stm32-csi: Fix dereference before NULL check
Dikshita Agarwal <quic_dikshita(a)quicinc.com>
media: iris: Fix memory leak by freeing untracked persist buffer
Matvey Kovalev <matvey.kovalev(a)ispras.ru>
wifi: ath11k: fix NULL dereference in ath11k_qmi_m3_load()
Charan Teja Kalla <charan.kalla(a)oss.qualcomm.com>
mm: swap: check for stable address space before operating on the VMA
Thadeu Lima de Souza Cascardo <cascardo(a)igalia.com>
media: uvcvideo: Mark invalid entities with id UVC_INVALID_ENTITY_ID
Larshin Sergey <Sergey.Larshin(a)kaspersky.com>
media: rc: fix races with imon_disconnect()
Duoming Zhou <duoming(a)zju.edu.cn>
media: tuner: xc5000: Fix use-after-free in xc5000_release
Duoming Zhou <duoming(a)zju.edu.cn>
media: i2c: tc358743: Fix use-after-free bugs caused by orphan timer in probe
Duoming Zhou <duoming(a)zju.edu.cn>
media: b2c2: Fix use-after-free causing by irq_check_work in flexcop_pci_remove
Jeongjun Park <aha310510(a)gmail.com>
ALSA: usb-audio: fix race condition to UAF in snd_usbmidi_free
Wang Haoran <haoranwangsec(a)gmail.com>
scsi: target: target_core_configfs: Add length check to avoid buffer overflow
Kees Cook <kees(a)kernel.org>
gcc-plugins: Remove TODO_verify_il for GCC >= 16
Yu Kuai <yukuai3(a)huawei.com>
blk-mq: fix blk_mq_tags double free while nr_requests grown
-------------
Diffstat:
Makefile | 4 +-
block/blk-mq-tag.c | 1 +
drivers/media/i2c/tc358743.c | 4 +-
drivers/media/pci/b2c2/flexcop-pci.c | 2 +-
drivers/media/platform/qcom/iris/iris_buffer.c | 10 ++++
drivers/media/platform/st/stm32/stm32-csi.c | 4 +-
drivers/media/rc/imon.c | 27 +++++++---
drivers/media/tuners/xc5000.c | 2 +-
drivers/media/usb/uvc/uvc_driver.c | 73 ++++++++++++++++----------
drivers/media/usb/uvc/uvcvideo.h | 2 +
drivers/net/wireless/ath/ath11k/qmi.c | 2 +-
drivers/target/target_core_configfs.c | 2 +-
mm/swapfile.c | 3 ++
scripts/gcc-plugins/gcc-common.h | 7 +++
sound/soc/qcom/qdsp6/topology.c | 4 +-
sound/usb/midi.c | 9 ++--
16 files changed, 105 insertions(+), 51 deletions(-)
This is the start of the stable review cycle for the 6.17.1 release.
There are 15 patches in this series, all will be posted as a response
to this one. If anyone has any issues with these being applied, please
let me know.
Responses should be made by Sun, 05 Oct 2025 16:02:25 +0000.
Anything received after that time might be too late.
The whole patch series can be found in one patch at:
https://www.kernel.org/pub/linux/kernel/v6.x/stable-review/patch-6.17.1-rc1…
or in the git tree and branch at:
git://git.kernel.org/pub/scm/linux/kernel/git/stable/linux-stable-rc.git linux-6.17.y
and the diffstat can be found below.
thanks,
greg k-h
-------------
Pseudo-Shortlog of commits:
Greg Kroah-Hartman <gregkh(a)linuxfoundation.org>
Linux 6.17.1-rc1
Srinivas Kandagatla <srinivas.kandagatla(a)oss.qualcomm.com>
ASoC: qcom: audioreach: fix potential null pointer dereference
Chandra Mohan Sundar <chandramohan.explore(a)gmail.com>
media: stm32-csi: Fix dereference before NULL check
Dikshita Agarwal <quic_dikshita(a)quicinc.com>
media: iris: Fix memory leak by freeing untracked persist buffer
Matvey Kovalev <matvey.kovalev(a)ispras.ru>
wifi: ath11k: fix NULL dereference in ath11k_qmi_m3_load()
Charan Teja Kalla <charan.kalla(a)oss.qualcomm.com>
mm: swap: check for stable address space before operating on the VMA
Thadeu Lima de Souza Cascardo <cascardo(a)igalia.com>
media: uvcvideo: Mark invalid entities with id UVC_INVALID_ENTITY_ID
Larshin Sergey <Sergey.Larshin(a)kaspersky.com>
media: rc: fix races with imon_disconnect()
Duoming Zhou <duoming(a)zju.edu.cn>
media: tuner: xc5000: Fix use-after-free in xc5000_release
Duoming Zhou <duoming(a)zju.edu.cn>
media: i2c: tc358743: Fix use-after-free bugs caused by orphan timer in probe
Duoming Zhou <duoming(a)zju.edu.cn>
media: b2c2: Fix use-after-free causing by irq_check_work in flexcop_pci_remove
Fedor Pchelkin <pchelkin(a)ispras.ru>
wifi: rtw89: fix use-after-free in rtw89_core_tx_kick_off_and_wait()
Jeongjun Park <aha310510(a)gmail.com>
ALSA: usb-audio: fix race condition to UAF in snd_usbmidi_free
Wang Haoran <haoranwangsec(a)gmail.com>
scsi: target: target_core_configfs: Add length check to avoid buffer overflow
Kees Cook <kees(a)kernel.org>
gcc-plugins: Remove TODO_verify_il for GCC >= 16
Yu Kuai <yukuai3(a)huawei.com>
blk-mq: fix blk_mq_tags double free while nr_requests grown
-------------
Diffstat:
Makefile | 4 +-
block/blk-mq-tag.c | 1 +
drivers/media/i2c/tc358743.c | 4 +-
drivers/media/pci/b2c2/flexcop-pci.c | 2 +-
drivers/media/platform/qcom/iris/iris_buffer.c | 10 ++++
drivers/media/platform/st/stm32/stm32-csi.c | 4 +-
drivers/media/rc/imon.c | 27 +++++++---
drivers/media/tuners/xc5000.c | 2 +-
drivers/media/usb/uvc/uvc_driver.c | 73 ++++++++++++++++----------
drivers/media/usb/uvc/uvcvideo.h | 2 +
drivers/net/wireless/ath/ath11k/qmi.c | 2 +-
drivers/net/wireless/realtek/rtw89/core.c | 30 ++++++++---
drivers/net/wireless/realtek/rtw89/core.h | 35 +++++++++++-
drivers/net/wireless/realtek/rtw89/pci.c | 3 +-
drivers/net/wireless/realtek/rtw89/ser.c | 2 +
drivers/target/target_core_configfs.c | 2 +-
mm/swapfile.c | 3 ++
scripts/gcc-plugins/gcc-common.h | 7 +++
sound/soc/qcom/qdsp6/topology.c | 4 +-
sound/usb/midi.c | 9 ++--
20 files changed, 166 insertions(+), 60 deletions(-)
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Make sure to drop the reference taken to the canvas platform device when
looking up its driver data.
Note that holding a reference to a device does not prevent its driver
data from going away so there is no point in keeping the reference.
Also note that commit 28f851e6afa8 ("soc: amlogic: canvas: add missing
put_device() call in meson_canvas_get()") fixed the leak in a lookup
error path, but the reference is still leaking on success.
Fixes: d4983983d987 ("soc: amlogic: add meson-canvas driver")
Cc: stable(a)vger.kernel.org # 4.20: 28f851e6afa8
Cc: Yu Kuai <yukuai3(a)huawei.com>
Signed-off-by: Johan Hovold <johan(a)kernel.org>
---
drivers/soc/amlogic/meson-canvas.c | 5 ++---
1 file changed, 2 insertions(+), 3 deletions(-)
diff --git a/drivers/soc/amlogic/meson-canvas.c b/drivers/soc/amlogic/meson-canvas.c
index b6e06c4d2117..0711088da5dc 100644
--- a/drivers/soc/amlogic/meson-canvas.c
+++ b/drivers/soc/amlogic/meson-canvas.c
@@ -73,10 +73,9 @@ struct meson_canvas *meson_canvas_get(struct device *dev)
* current state, this driver probe cannot return -EPROBE_DEFER
*/
canvas = dev_get_drvdata(&canvas_pdev->dev);
- if (!canvas) {
- put_device(&canvas_pdev->dev);
+ put_device(&canvas_pdev->dev);
+ if (!canvas)
return ERR_PTR(-EINVAL);
- }
return canvas;
}
--
2.49.1
Hi,
This series fixes the long standing issue with ACS in DT platforms. There are
two fixes in this series, both fixing independent issues on their own, but both
are needed to properly enable ACS on DT platforms (well, patch 1 is only needed
for Juno board, but that was a blocker for patch 2, more below...).
Issue(s) background
===================
Back in 2024, Xingang Wang first noted a failure in attaching the HiSilicon SEC
device to QEMU ARM64 pci-root-port device [1]. He then tracked down the issue to
ACS not being enabled for the QEMU Root Port device and he proposed a patch to
fix it [2].
Once the patch got applied, people reported PCIe issues with linux-next on the
ARM Juno Development boards, where they saw failure in enumerating the endpoint
devices [3][4]. So soon, the patch got dropped, but the actual issue with the
ARM Juno boards was left behind.
Fast forward to 2024, Pavan resubmitted the same fix [5] for his own usecase,
hoping that someone in the community would fix the issue with ARM Juno boards.
But the patch was rightly rejected, as a patch that was known to cause issues
should not be merged to the kernel. But again, no one investigated the Juno
issue and it was left behind again.
Now it ended up in my plate and I managed to track down the issue with the help
of Naresh who got access to the Juno boards in LKFT. The Juno issue is with the
PCIe switch from Microsemi/IDT, which triggers ACS Source Validation error on
Completions received for the Configuration Read Request from a device connected
to the downstream port that has not yet captured the PCIe bus number. As per the
PCIe spec r6.0 sec 2.2.6.2, "Functions must capture the Bus and Device Numbers
supplied with all Type 0 Configuration Write Requests completed by the Function
and supply these numbers in the Bus and Device Number fields of the Requester ID
for all Requests". So during the first Configuration Read Request issued by the
switch downstream port during enumeration (for reading Vendor ID), Bus and
Device numbers will be unknown to the device. So it responds to the Read Request
with Completion having Bus and Device number as 0. The switch interprets the
Completion as an ACS Source Validation error and drops the completion, leading
to the failure in detecting the endpoint device. Though the PCIe spec r6.0, sec
6.12.1.1, states that "Completions are never affected by ACS Source Validation".
This behavior is in violation of the spec.
This issue was already found and addressed with a quirk for a different device
from Microsemi with 'commit, aa667c6408d2 ("PCI: Workaround IDT switch ACS
Source Validation erratum")'. Apparently, this issue seems to be documented in
the erratum #36 of IDT 89H32H8G3-YC, which is not publicly available.
Solution for Juno issue
=======================
To fix this issue, I've extended the quirk to the Device ID of the switch
found in Juno R2 boards. I believe the same switch is also present in Juno R1
board as well.
With Patch 1, the Juno R2 boards can now detect the endpoints even with ACS
enabled for the Switch downstream ports. Finally, I added patch 2 that properly
enables ACS for all the PCI devices on DT platforms.
It should be noted that even without patch 2 which enables ACS for the Root
Port, the Juno boards were failing since 'commit, bcb81ac6ae3c ("iommu: Get
DT/ACPI parsing into the proper probe path")' as reported in LKFT [6]. I
believe, this commit made sure pci_request_acs() gets called before the
enumeration of the switch downstream ports. The LKFT team ended up disabling
ACS using cmdline param 'pci=config_acs=000000@pci:0:0'. So I added the above
mentioned commit as a Fixes tag for patch 1.
Also, to mitigate this issue, one could enumerate all the PCIe devices in
bootloader without enabling ACS (as also noted by Robin in the LKFT thread).
This will make sure that the endpoint device has a valid bus number when it
responds to the first Configuration Read Request from the switch downstream
port. So the ACS Source Validation error doesn't get triggered.
Solution for ACS issue
======================
To fix this issue, I've kept the patch from Xingang as is (with rewording of the
patch subject/description). This patch moves the pci_request_acs() call to
devm_of_pci_bridge_init(), which gets called during the host bridge
registration. This makes sure that the 'pci_acs_enable' flag set by
pci_request_acs() is getting set before the enumeration of the Root Port device.
So now, ACS will be enabled for all ACS capable devices of DT platforms.
[1] https://lore.kernel.org/all/038397a6-57e2-b6fc-6e1c-7c03b7be9d96@huawei.com
[2] https://lore.kernel.org/all/1621566204-37456-1-git-send-email-wangxingang5@…
[3] https://lore.kernel.org/all/01314d70-41e6-70f9-e496-84091948701a@samsung.com
[4] https://lore.kernel.org/all/CADYN=9JWU3CMLzMEcD5MSQGnaLyDRSKc5SofBFHUax6YuT…
[5] https://lore.kernel.org/linux-pci/20241107-pci_acs_fix-v1-1-185a2462a571@qu…
[6] https://lists.linaro.org/archives/list/lkft-triage@lists.linaro.org/message…
Signed-off-by: Manivannan Sadhasivam <manivannan.sadhasivam(a)oss.qualcomm.com>
---
Manivannan Sadhasivam (1):
PCI: Extend pci_idt_bus_quirk() for IDT switch with Device ID 0x8090
Xingang Wang (1):
iommu/of: Call pci_request_acs() before enumerating the Root Port device
drivers/iommu/of_iommu.c | 1 -
drivers/pci/of.c | 8 +++++++-
drivers/pci/probe.c | 2 +-
3 files changed, 8 insertions(+), 3 deletions(-)
---
base-commit: 8f5ae30d69d7543eee0d70083daf4de8fe15d585
change-id: 20250910-pci-acs-cb4fa3983a2c
Best regards,
--
Manivannan Sadhasivam <manivannan.sadhasivam(a)oss.qualcomm.com>
Hello Ian and maintainers,
Just a gentle ping on this patch. It's been 10 days since v2 was sent
incorporating Ian's feedback to merge the chanlist_len check with the
existing early return.
Please let me know if any further changes are needed.
Thank you,
Deepanshu
The patch below does not apply to the 5.4-stable tree.
If someone wants it applied there, or to any other stable or longterm
tree, then please email the backport, including the original git commit
id to <stable(a)vger.kernel.org>.
To reproduce the conflict and resubmit, you may use the following commands:
git fetch https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git/ linux-5.4.y
git checkout FETCH_HEAD
git cherry-pick -x 40b7a19f321e65789612ebaca966472055dab48c
# <resolve conflicts, build, test, etc.>
git commit -s
git send-email --to '<stable(a)vger.kernel.org>' --in-reply-to '2025100341-dime-left-e15f@gregkh' --subject-prefix 'PATCH 5.4.y' HEAD^..
Possible dependencies:
thanks,
greg k-h
------------------ original commit in Linus's tree ------------------
From 40b7a19f321e65789612ebaca966472055dab48c Mon Sep 17 00:00:00 2001
From: Duoming Zhou <duoming(a)zju.edu.cn>
Date: Wed, 17 Sep 2025 17:56:08 +0800
Subject: [PATCH] media: tuner: xc5000: Fix use-after-free in xc5000_release
The original code uses cancel_delayed_work() in xc5000_release(), which
does not guarantee that the delayed work item timer_sleep has fully
completed if it was already running. This leads to use-after-free scenarios
where xc5000_release() may free the xc5000_priv while timer_sleep is still
active and attempts to dereference the xc5000_priv.
A typical race condition is illustrated below:
CPU 0 (release thread) | CPU 1 (delayed work callback)
xc5000_release() | xc5000_do_timer_sleep()
cancel_delayed_work() |
hybrid_tuner_release_state(priv) |
kfree(priv) |
| priv = container_of() // UAF
Replace cancel_delayed_work() with cancel_delayed_work_sync() to ensure
that the timer_sleep is properly canceled before the xc5000_priv memory
is deallocated.
A deadlock concern was considered: xc5000_release() is called in a process
context and is not holding any locks that the timer_sleep work item might
also need. Therefore, the use of the _sync() variant is safe here.
This bug was initially identified through static analysis.
Fixes: f7a27ff1fb77 ("[media] xc5000: delay tuner sleep to 5 seconds")
Cc: stable(a)vger.kernel.org
Signed-off-by: Duoming Zhou <duoming(a)zju.edu.cn>
Signed-off-by: Hans Verkuil <hverkuil+cisco(a)kernel.org>
[hverkuil: fix typo in Subject: tunner -> tuner]
diff --git a/drivers/media/tuners/xc5000.c b/drivers/media/tuners/xc5000.c
index bf4ff461e082..a28481edd22e 100644
--- a/drivers/media/tuners/xc5000.c
+++ b/drivers/media/tuners/xc5000.c
@@ -1304,7 +1304,7 @@ static void xc5000_release(struct dvb_frontend *fe)
mutex_lock(&xc5000_list_mutex);
if (priv) {
- cancel_delayed_work(&priv->timer_sleep);
+ cancel_delayed_work_sync(&priv->timer_sleep);
hybrid_tuner_release_state(priv);
}
Hi,
Please backport:
commit a40282dd3c48 ("gcc-plugins: Remove TODO_verify_il for GCC >= 16")
to all stable kernel versions. This prepares the GCC plugins for the
coming GCC 16 release.
Thanks!
-Kees
--
Kees Cook
The patch below does not apply to the 5.10-stable tree.
If someone wants it applied there, or to any other stable or longterm
tree, then please email the backport, including the original git commit
id to <stable(a)vger.kernel.org>.
To reproduce the conflict and resubmit, you may use the following commands:
git fetch https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git/ linux-5.10.y
git checkout FETCH_HEAD
git cherry-pick -x 40b7a19f321e65789612ebaca966472055dab48c
# <resolve conflicts, build, test, etc.>
git commit -s
git send-email --to '<stable(a)vger.kernel.org>' --in-reply-to '2025100341-cobbler-alabaster-748a@gregkh' --subject-prefix 'PATCH 5.10.y' HEAD^..
Possible dependencies:
thanks,
greg k-h
------------------ original commit in Linus's tree ------------------
From 40b7a19f321e65789612ebaca966472055dab48c Mon Sep 17 00:00:00 2001
From: Duoming Zhou <duoming(a)zju.edu.cn>
Date: Wed, 17 Sep 2025 17:56:08 +0800
Subject: [PATCH] media: tuner: xc5000: Fix use-after-free in xc5000_release
The original code uses cancel_delayed_work() in xc5000_release(), which
does not guarantee that the delayed work item timer_sleep has fully
completed if it was already running. This leads to use-after-free scenarios
where xc5000_release() may free the xc5000_priv while timer_sleep is still
active and attempts to dereference the xc5000_priv.
A typical race condition is illustrated below:
CPU 0 (release thread) | CPU 1 (delayed work callback)
xc5000_release() | xc5000_do_timer_sleep()
cancel_delayed_work() |
hybrid_tuner_release_state(priv) |
kfree(priv) |
| priv = container_of() // UAF
Replace cancel_delayed_work() with cancel_delayed_work_sync() to ensure
that the timer_sleep is properly canceled before the xc5000_priv memory
is deallocated.
A deadlock concern was considered: xc5000_release() is called in a process
context and is not holding any locks that the timer_sleep work item might
also need. Therefore, the use of the _sync() variant is safe here.
This bug was initially identified through static analysis.
Fixes: f7a27ff1fb77 ("[media] xc5000: delay tuner sleep to 5 seconds")
Cc: stable(a)vger.kernel.org
Signed-off-by: Duoming Zhou <duoming(a)zju.edu.cn>
Signed-off-by: Hans Verkuil <hverkuil+cisco(a)kernel.org>
[hverkuil: fix typo in Subject: tunner -> tuner]
diff --git a/drivers/media/tuners/xc5000.c b/drivers/media/tuners/xc5000.c
index bf4ff461e082..a28481edd22e 100644
--- a/drivers/media/tuners/xc5000.c
+++ b/drivers/media/tuners/xc5000.c
@@ -1304,7 +1304,7 @@ static void xc5000_release(struct dvb_frontend *fe)
mutex_lock(&xc5000_list_mutex);
if (priv) {
- cancel_delayed_work(&priv->timer_sleep);
+ cancel_delayed_work_sync(&priv->timer_sleep);
hybrid_tuner_release_state(priv);
}
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weiteres Gespräch freuen. Ich freue mich auf Ihre Antwort.
Mit freundlichen Grüßen,
Shun Tung
From: Kuniyuki Iwashima <kuniyu(a)amazon.com>
[ Upstream commit df207de9d9e7a4d92f8567e2c539d9c8c12fd99d ]
Matt Dowling reported a weird UDP memory usage issue.
Under normal operation, the UDP memory usage reported in /proc/net/sockstat
remains close to zero. However, it occasionally spiked to 524,288 pages
and never dropped. Moreover, the value doubled when the application was
terminated. Finally, it caused intermittent packet drops.
We can reproduce the issue with the script below [0]:
1. /proc/net/sockstat reports 0 pages
# cat /proc/net/sockstat | grep UDP:
UDP: inuse 1 mem 0
2. Run the script till the report reaches 524,288
# python3 test.py & sleep 5
# cat /proc/net/sockstat | grep UDP:
UDP: inuse 3 mem 524288 <-- (INT_MAX + 1) >> PAGE_SHIFT
3. Kill the socket and confirm the number never drops
# pkill python3 && sleep 5
# cat /proc/net/sockstat | grep UDP:
UDP: inuse 1 mem 524288
4. (necessary since v6.0) Trigger proto_memory_pcpu_drain()
# python3 test.py & sleep 1 && pkill python3
5. The number doubles
# cat /proc/net/sockstat | grep UDP:
UDP: inuse 1 mem 1048577
The application set INT_MAX to SO_RCVBUF, which triggered an integer
overflow in udp_rmem_release().
When a socket is close()d, udp_destruct_common() purges its receive
queue and sums up skb->truesize in the queue. This total is calculated
and stored in a local unsigned integer variable.
The total size is then passed to udp_rmem_release() to adjust memory
accounting. However, because the function takes a signed integer
argument, the total size can wrap around, causing an overflow.
Then, the released amount is calculated as follows:
1) Add size to sk->sk_forward_alloc.
2) Round down sk->sk_forward_alloc to the nearest lower multiple of
PAGE_SIZE and assign it to amount.
3) Subtract amount from sk->sk_forward_alloc.
4) Pass amount >> PAGE_SHIFT to __sk_mem_reduce_allocated().
When the issue occurred, the total in udp_destruct_common() was 2147484480
(INT_MAX + 833), which was cast to -2147482816 in udp_rmem_release().
At 1) sk->sk_forward_alloc is changed from 3264 to -2147479552, and
2) sets -2147479552 to amount. 3) reverts the wraparound, so we don't
see a warning in inet_sock_destruct(). However, udp_memory_allocated
ends up doubling at 4).
Since commit 3cd3399dd7a8 ("net: implement per-cpu reserves for
memory_allocated"), memory usage no longer doubles immediately after
a socket is close()d because __sk_mem_reduce_allocated() caches the
amount in udp_memory_per_cpu_fw_alloc. However, the next time a UDP
socket receives a packet, the subtraction takes effect, causing UDP
memory usage to double.
This issue makes further memory allocation fail once the socket's
sk->sk_rmem_alloc exceeds net.ipv4.udp_rmem_min, resulting in packet
drops.
To prevent this issue, let's use unsigned int for the calculation and
call sk_forward_alloc_add() only once for the small delta.
Note that first_packet_length() also potentially has the same problem.
[0]:
from socket import *
SO_RCVBUFFORCE = 33
INT_MAX = (2 ** 31) - 1
s = socket(AF_INET, SOCK_DGRAM)
s.bind(('', 0))
s.setsockopt(SOL_SOCKET, SO_RCVBUFFORCE, INT_MAX)
c = socket(AF_INET, SOCK_DGRAM)
c.connect(s.getsockname())
data = b'a' * 100
while True:
c.send(data)
Fixes: f970bd9e3a06 ("udp: implement memory accounting helpers")
Reported-by: Matt Dowling <madowlin(a)amazon.com>
Signed-off-by: Kuniyuki Iwashima <kuniyu(a)amazon.com>
Reviewed-by: Willem de Bruijn <willemb(a)google.com>
Link: https://patch.msgid.link/20250401184501.67377-3-kuniyu@amazon.com
Signed-off-by: Jakub Kicinski <kuba(a)kernel.org>
(cherry picked from commit df207de9d9e7a4d92f8567e2c539d9c8c12fd99d)
[Yifei: resolve minor conflicts and fix CVE-2025-22058]
Signed-off-by: Yifei Liu <yifei.l.liu(a)oracle.com>
---
net/ipv4/udp.c | 16 +++++++---------
1 file changed, 7 insertions(+), 9 deletions(-)
diff --git a/net/ipv4/udp.c b/net/ipv4/udp.c
index 51a12fa486b6..3ebd5765fb9f 100644
--- a/net/ipv4/udp.c
+++ b/net/ipv4/udp.c
@@ -1459,12 +1459,12 @@ static bool udp_skb_has_head_state(struct sk_buff *skb)
}
/* fully reclaim rmem/fwd memory allocated for skb */
-static void udp_rmem_release(struct sock *sk, int size, int partial,
- bool rx_queue_lock_held)
+static void udp_rmem_release(struct sock *sk, unsigned int size,
+ int partial, bool rx_queue_lock_held)
{
struct udp_sock *up = udp_sk(sk);
struct sk_buff_head *sk_queue;
- int amt;
+ unsigned int amt;
if (likely(partial)) {
up->forward_deficit += size;
@@ -1484,10 +1484,8 @@ static void udp_rmem_release(struct sock *sk, int size, int partial,
if (!rx_queue_lock_held)
spin_lock(&sk_queue->lock);
-
- sk->sk_forward_alloc += size;
- amt = (sk->sk_forward_alloc - partial) & ~(SK_MEM_QUANTUM - 1);
- sk->sk_forward_alloc -= amt;
+ amt = (size + sk->sk_forward_alloc - partial) & ~(PAGE_SIZE - 1);
+ sk->sk_forward_alloc += size - amt;
if (amt)
__sk_mem_reduce_allocated(sk, amt >> SK_MEM_QUANTUM_SHIFT);
@@ -1671,7 +1669,7 @@ EXPORT_SYMBOL_GPL(skb_consume_udp);
static struct sk_buff *__first_packet_length(struct sock *sk,
struct sk_buff_head *rcvq,
- int *total)
+ unsigned int *total)
{
struct sk_buff *skb;
@@ -1704,8 +1702,8 @@ static int first_packet_length(struct sock *sk)
{
struct sk_buff_head *rcvq = &udp_sk(sk)->reader_queue;
struct sk_buff_head *sk_queue = &sk->sk_receive_queue;
+ unsigned int total = 0;
struct sk_buff *skb;
- int total = 0;
int res;
spin_lock_bh(&rcvq->lock);
--
2.50.1
From: Conor Dooley <conor.dooley(a)microchip.com>
The kernel uses the standard rustc targets for non-x86 targets, and out
of those only 64-bit arm's target has kcfi support enabled. For x86, the
custom 64-bit target enables kcfi.
The HAVE_CFI_ICALL_NORMALIZE_INTEGERS_RUSTC config option that allows
CFI_CLANG to be used in combination with RUST does not check whether the
rustc target supports kcfi. This breaks the build on riscv (and
presumably 32-bit arm) when CFI_CLANG and RUST are enabled at the same
time.
Ordinarily, a rustc-option check would be used to detect target support
but unfortunately rustc-option filters out the target for reasons given
in commit 46e24a545cdb4 ("rust: kasan/kbuild: fix missing flags on first
build"). As a result, if the host supports kcfi but the target does not,
e.g. when building for riscv on x86_64, the build would remain broken.
Instead, make HAVE_CFI_ICALL_NORMALIZE_INTEGERS_RUSTC depend on the only
two architectures where the target used supports it to fix the build.
CC: stable(a)vger.kernel.org
Fixes: ca627e636551e ("rust: cfi: add support for CFI_CLANG with Rust")
Signed-off-by: Conor Dooley <conor.dooley(a)microchip.com>
---
CC: Paul Walmsley <paul.walmsley(a)sifive.com>
CC: Palmer Dabbelt <palmer(a)dabbelt.com>
CC: Alexandre Ghiti <alex(a)ghiti.fr>
CC: Miguel Ojeda <ojeda(a)kernel.org>
CC: Alex Gaynor <alex.gaynor(a)gmail.com>
CC: Boqun Feng <boqun.feng(a)gmail.com>
CC: Gary Guo <gary(a)garyguo.net>
CC: "Björn Roy Baron" <bjorn3_gh(a)protonmail.com>
CC: Benno Lossin <lossin(a)kernel.org>
CC: Andreas Hindborg <a.hindborg(a)kernel.org>
CC: Alice Ryhl <aliceryhl(a)google.com>
CC: Trevor Gross <tmgross(a)umich.edu>
CC: Danilo Krummrich <dakr(a)kernel.org>
CC: Kees Cook <kees(a)kernel.org>
CC: Sami Tolvanen <samitolvanen(a)google.com>
CC: Matthew Maurer <mmaurer(a)google.com>
CC: "Peter Zijlstra (Intel)" <peterz(a)infradead.org>
CC: linux-kernel(a)vger.kernel.org
CC: linux-riscv(a)lists.infradead.org
CC: rust-for-linux(a)vger.kernel.org
---
arch/Kconfig | 1 +
1 file changed, 1 insertion(+)
diff --git a/arch/Kconfig b/arch/Kconfig
index d1b4ffd6e0856..880cddff5eda7 100644
--- a/arch/Kconfig
+++ b/arch/Kconfig
@@ -917,6 +917,7 @@ config HAVE_CFI_ICALL_NORMALIZE_INTEGERS_RUSTC
def_bool y
depends on HAVE_CFI_ICALL_NORMALIZE_INTEGERS_CLANG
depends on RUSTC_VERSION >= 107900
+ depends on ARM64 || X86_64
# With GCOV/KASAN we need this fix: https://github.com/rust-lang/rust/pull/129373
depends on (RUSTC_LLVM_VERSION >= 190103 && RUSTC_VERSION >= 108200) || \
(!GCOV_KERNEL && !KASAN_GENERIC && !KASAN_SW_TAGS)
--
2.47.2
The patch below does not apply to the 5.4-stable tree.
If someone wants it applied there, or to any other stable or longterm
tree, then please email the backport, including the original git commit
id to <stable(a)vger.kernel.org>.
To reproduce the conflict and resubmit, you may use the following commands:
git fetch https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git/ linux-5.4.y
git checkout FETCH_HEAD
git cherry-pick -x fa0f61cc1d828178aa921475a9b786e7fbb65ccb
# <resolve conflicts, build, test, etc.>
git commit -s
git send-email --to '<stable(a)vger.kernel.org>' --in-reply-to '2025100320-pout-unwired-1096@gregkh' --subject-prefix 'PATCH 5.4.y' HEAD^..
Possible dependencies:
thanks,
greg k-h
------------------ original commit in Linus's tree ------------------
From fa0f61cc1d828178aa921475a9b786e7fbb65ccb Mon Sep 17 00:00:00 2001
From: Larshin Sergey <Sergey.Larshin(a)kaspersky.com>
Date: Tue, 29 Jul 2025 13:13:32 +0300
Subject: [PATCH] media: rc: fix races with imon_disconnect()
Syzbot reports a KASAN issue as below:
BUG: KASAN: use-after-free in __create_pipe include/linux/usb.h:1945 [inline]
BUG: KASAN: use-after-free in send_packet+0xa2d/0xbc0 drivers/media/rc/imon.c:627
Read of size 4 at addr ffff8880256fb000 by task syz-executor314/4465
CPU: 2 PID: 4465 Comm: syz-executor314 Not tainted 6.0.0-rc1-syzkaller #0
Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS 1.14.0-2 04/01/2014
Call Trace:
<TASK>
__dump_stack lib/dump_stack.c:88 [inline]
dump_stack_lvl+0xcd/0x134 lib/dump_stack.c:106
print_address_description mm/kasan/report.c:317 [inline]
print_report.cold+0x2ba/0x6e9 mm/kasan/report.c:433
kasan_report+0xb1/0x1e0 mm/kasan/report.c:495
__create_pipe include/linux/usb.h:1945 [inline]
send_packet+0xa2d/0xbc0 drivers/media/rc/imon.c:627
vfd_write+0x2d9/0x550 drivers/media/rc/imon.c:991
vfs_write+0x2d7/0xdd0 fs/read_write.c:576
ksys_write+0x127/0x250 fs/read_write.c:631
do_syscall_x64 arch/x86/entry/common.c:50 [inline]
do_syscall_64+0x35/0xb0 arch/x86/entry/common.c:80
entry_SYSCALL_64_after_hwframe+0x63/0xcd
The iMON driver improperly releases the usb_device reference in
imon_disconnect without coordinating with active users of the
device.
Specifically, the fields usbdev_intf0 and usbdev_intf1 are not
protected by the users counter (ictx->users). During probe,
imon_init_intf0 or imon_init_intf1 increments the usb_device
reference count depending on the interface. However, during
disconnect, usb_put_dev is called unconditionally, regardless of
actual usage.
As a result, if vfd_write or other operations are still in
progress after disconnect, this can lead to a use-after-free of
the usb_device pointer.
Thread 1 vfd_write Thread 2 imon_disconnect
...
if
usb_put_dev(ictx->usbdev_intf0)
else
usb_put_dev(ictx->usbdev_intf1)
...
while
send_packet
if
pipe = usb_sndintpipe(
ictx->usbdev_intf0) UAF
else
pipe = usb_sndctrlpipe(
ictx->usbdev_intf0, 0) UAF
Guard access to usbdev_intf0 and usbdev_intf1 after disconnect by
checking ictx->disconnected in all writer paths. Add early return
with -ENODEV in send_packet(), vfd_write(), lcd_write() and
display_open() if the device is no longer present.
Set and read ictx->disconnected under ictx->lock to ensure memory
synchronization. Acquire the lock in imon_disconnect() before setting
the flag to synchronize with any ongoing operations.
Ensure writers exit early and safely after disconnect before the USB
core proceeds with cleanup.
Found by Linux Verification Center (linuxtesting.org) with Syzkaller.
Reported-by: syzbot+f1a69784f6efe748c3bf(a)syzkaller.appspotmail.com
Closes: https://syzkaller.appspot.com/bug?extid=f1a69784f6efe748c3bf
Fixes: 21677cfc562a ("V4L/DVB: ir-core: add imon driver")
Cc: stable(a)vger.kernel.org
Signed-off-by: Larshin Sergey <Sergey.Larshin(a)kaspersky.com>
Signed-off-by: Sean Young <sean(a)mess.org>
Signed-off-by: Hans Verkuil <hverkuil+cisco(a)kernel.org>
diff --git a/drivers/media/rc/imon.c b/drivers/media/rc/imon.c
index 91d05aadced3..35b9e07003d8 100644
--- a/drivers/media/rc/imon.c
+++ b/drivers/media/rc/imon.c
@@ -531,7 +531,9 @@ static int display_open(struct inode *inode, struct file *file)
mutex_lock(&ictx->lock);
- if (!ictx->display_supported) {
+ if (ictx->disconnected) {
+ retval = -ENODEV;
+ } else if (!ictx->display_supported) {
pr_err("display not supported by device\n");
retval = -ENODEV;
} else if (ictx->display_isopen) {
@@ -595,6 +597,9 @@ static int send_packet(struct imon_context *ictx)
lockdep_assert_held(&ictx->lock);
+ if (ictx->disconnected)
+ return -ENODEV;
+
/* Check if we need to use control or interrupt urb */
if (!ictx->tx_control) {
pipe = usb_sndintpipe(ictx->usbdev_intf0,
@@ -949,12 +954,14 @@ static ssize_t vfd_write(struct file *file, const char __user *buf,
static const unsigned char vfd_packet6[] = {
0x01, 0x00, 0x00, 0x00, 0x00, 0xFF, 0xFF };
- if (ictx->disconnected)
- return -ENODEV;
-
if (mutex_lock_interruptible(&ictx->lock))
return -ERESTARTSYS;
+ if (ictx->disconnected) {
+ retval = -ENODEV;
+ goto exit;
+ }
+
if (!ictx->dev_present_intf0) {
pr_err_ratelimited("no iMON device present\n");
retval = -ENODEV;
@@ -1029,11 +1036,13 @@ static ssize_t lcd_write(struct file *file, const char __user *buf,
int retval = 0;
struct imon_context *ictx = file->private_data;
- if (ictx->disconnected)
- return -ENODEV;
-
mutex_lock(&ictx->lock);
+ if (ictx->disconnected) {
+ retval = -ENODEV;
+ goto exit;
+ }
+
if (!ictx->display_supported) {
pr_err_ratelimited("no iMON display present\n");
retval = -ENODEV;
@@ -2507,7 +2516,11 @@ static void imon_disconnect(struct usb_interface *interface)
int ifnum;
ictx = usb_get_intfdata(interface);
+
+ mutex_lock(&ictx->lock);
ictx->disconnected = true;
+ mutex_unlock(&ictx->lock);
+
dev = ictx->dev;
ifnum = interface->cur_altsetting->desc.bInterfaceNumber;
The patch below does not apply to the 5.15-stable tree.
If someone wants it applied there, or to any other stable or longterm
tree, then please email the backport, including the original git commit
id to <stable(a)vger.kernel.org>.
To reproduce the conflict and resubmit, you may use the following commands:
git fetch https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git/ linux-5.15.y
git checkout FETCH_HEAD
git cherry-pick -x 40b7a19f321e65789612ebaca966472055dab48c
# <resolve conflicts, build, test, etc.>
git commit -s
git send-email --to '<stable(a)vger.kernel.org>' --in-reply-to '2025100340-pleat-amusable-e5dc@gregkh' --subject-prefix 'PATCH 5.15.y' HEAD^..
Possible dependencies:
thanks,
greg k-h
------------------ original commit in Linus's tree ------------------
From 40b7a19f321e65789612ebaca966472055dab48c Mon Sep 17 00:00:00 2001
From: Duoming Zhou <duoming(a)zju.edu.cn>
Date: Wed, 17 Sep 2025 17:56:08 +0800
Subject: [PATCH] media: tuner: xc5000: Fix use-after-free in xc5000_release
The original code uses cancel_delayed_work() in xc5000_release(), which
does not guarantee that the delayed work item timer_sleep has fully
completed if it was already running. This leads to use-after-free scenarios
where xc5000_release() may free the xc5000_priv while timer_sleep is still
active and attempts to dereference the xc5000_priv.
A typical race condition is illustrated below:
CPU 0 (release thread) | CPU 1 (delayed work callback)
xc5000_release() | xc5000_do_timer_sleep()
cancel_delayed_work() |
hybrid_tuner_release_state(priv) |
kfree(priv) |
| priv = container_of() // UAF
Replace cancel_delayed_work() with cancel_delayed_work_sync() to ensure
that the timer_sleep is properly canceled before the xc5000_priv memory
is deallocated.
A deadlock concern was considered: xc5000_release() is called in a process
context and is not holding any locks that the timer_sleep work item might
also need. Therefore, the use of the _sync() variant is safe here.
This bug was initially identified through static analysis.
Fixes: f7a27ff1fb77 ("[media] xc5000: delay tuner sleep to 5 seconds")
Cc: stable(a)vger.kernel.org
Signed-off-by: Duoming Zhou <duoming(a)zju.edu.cn>
Signed-off-by: Hans Verkuil <hverkuil+cisco(a)kernel.org>
[hverkuil: fix typo in Subject: tunner -> tuner]
diff --git a/drivers/media/tuners/xc5000.c b/drivers/media/tuners/xc5000.c
index bf4ff461e082..a28481edd22e 100644
--- a/drivers/media/tuners/xc5000.c
+++ b/drivers/media/tuners/xc5000.c
@@ -1304,7 +1304,7 @@ static void xc5000_release(struct dvb_frontend *fe)
mutex_lock(&xc5000_list_mutex);
if (priv) {
- cancel_delayed_work(&priv->timer_sleep);
+ cancel_delayed_work_sync(&priv->timer_sleep);
hybrid_tuner_release_state(priv);
}
The patch below does not apply to the 6.1-stable tree.
If someone wants it applied there, or to any other stable or longterm
tree, then please email the backport, including the original git commit
id to <stable(a)vger.kernel.org>.
To reproduce the conflict and resubmit, you may use the following commands:
git fetch https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git/ linux-6.1.y
git checkout FETCH_HEAD
git cherry-pick -x 40b7a19f321e65789612ebaca966472055dab48c
# <resolve conflicts, build, test, etc.>
git commit -s
git send-email --to '<stable(a)vger.kernel.org>' --in-reply-to '2025100339-scarring-buffoon-fbc5@gregkh' --subject-prefix 'PATCH 6.1.y' HEAD^..
Possible dependencies:
thanks,
greg k-h
------------------ original commit in Linus's tree ------------------
From 40b7a19f321e65789612ebaca966472055dab48c Mon Sep 17 00:00:00 2001
From: Duoming Zhou <duoming(a)zju.edu.cn>
Date: Wed, 17 Sep 2025 17:56:08 +0800
Subject: [PATCH] media: tuner: xc5000: Fix use-after-free in xc5000_release
The original code uses cancel_delayed_work() in xc5000_release(), which
does not guarantee that the delayed work item timer_sleep has fully
completed if it was already running. This leads to use-after-free scenarios
where xc5000_release() may free the xc5000_priv while timer_sleep is still
active and attempts to dereference the xc5000_priv.
A typical race condition is illustrated below:
CPU 0 (release thread) | CPU 1 (delayed work callback)
xc5000_release() | xc5000_do_timer_sleep()
cancel_delayed_work() |
hybrid_tuner_release_state(priv) |
kfree(priv) |
| priv = container_of() // UAF
Replace cancel_delayed_work() with cancel_delayed_work_sync() to ensure
that the timer_sleep is properly canceled before the xc5000_priv memory
is deallocated.
A deadlock concern was considered: xc5000_release() is called in a process
context and is not holding any locks that the timer_sleep work item might
also need. Therefore, the use of the _sync() variant is safe here.
This bug was initially identified through static analysis.
Fixes: f7a27ff1fb77 ("[media] xc5000: delay tuner sleep to 5 seconds")
Cc: stable(a)vger.kernel.org
Signed-off-by: Duoming Zhou <duoming(a)zju.edu.cn>
Signed-off-by: Hans Verkuil <hverkuil+cisco(a)kernel.org>
[hverkuil: fix typo in Subject: tunner -> tuner]
diff --git a/drivers/media/tuners/xc5000.c b/drivers/media/tuners/xc5000.c
index bf4ff461e082..a28481edd22e 100644
--- a/drivers/media/tuners/xc5000.c
+++ b/drivers/media/tuners/xc5000.c
@@ -1304,7 +1304,7 @@ static void xc5000_release(struct dvb_frontend *fe)
mutex_lock(&xc5000_list_mutex);
if (priv) {
- cancel_delayed_work(&priv->timer_sleep);
+ cancel_delayed_work_sync(&priv->timer_sleep);
hybrid_tuner_release_state(priv);
}
The patch below does not apply to the 5.4-stable tree.
If someone wants it applied there, or to any other stable or longterm
tree, then please email the backport, including the original git commit
id to <stable(a)vger.kernel.org>.
To reproduce the conflict and resubmit, you may use the following commands:
git fetch https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git/ linux-5.4.y
git checkout FETCH_HEAD
git cherry-pick -x 79d10f4f21a92e459b2276a77be62c59c1502c9d
# <resolve conflicts, build, test, etc.>
git commit -s
git send-email --to '<stable(a)vger.kernel.org>' --in-reply-to '2025100333-silica-pebble-c8d6@gregkh' --subject-prefix 'PATCH 5.4.y' HEAD^..
Possible dependencies:
thanks,
greg k-h
------------------ original commit in Linus's tree ------------------
From 79d10f4f21a92e459b2276a77be62c59c1502c9d Mon Sep 17 00:00:00 2001
From: Duoming Zhou <duoming(a)zju.edu.cn>
Date: Wed, 17 Sep 2025 17:57:42 +0800
Subject: [PATCH] media: i2c: tc358743: Fix use-after-free bugs caused by
orphan timer in probe
The state->timer is a cyclic timer that schedules work_i2c_poll and
delayed_work_enable_hotplug, while rearming itself. Using timer_delete()
fails to guarantee the timer isn't still running when destroyed, similarly
cancel_delayed_work() cannot ensure delayed_work_enable_hotplug has
terminated if already executing. During probe failure after timer
initialization, these may continue running as orphans and reference the
already-freed tc358743_state object through tc358743_irq_poll_timer.
The following is the trace captured by KASAN.
BUG: KASAN: slab-use-after-free in __run_timer_base.part.0+0x7d7/0x8c0
Write of size 8 at addr ffff88800ded83c8 by task swapper/1/0
...
Call Trace:
<IRQ>
dump_stack_lvl+0x55/0x70
print_report+0xcf/0x610
? __pfx_sched_balance_find_src_group+0x10/0x10
? __run_timer_base.part.0+0x7d7/0x8c0
kasan_report+0xb8/0xf0
? __run_timer_base.part.0+0x7d7/0x8c0
__run_timer_base.part.0+0x7d7/0x8c0
? rcu_sched_clock_irq+0xb06/0x27d0
? __pfx___run_timer_base.part.0+0x10/0x10
? try_to_wake_up+0xb15/0x1960
? tmigr_update_events+0x280/0x740
? _raw_spin_lock_irq+0x80/0xe0
? __pfx__raw_spin_lock_irq+0x10/0x10
tmigr_handle_remote_up+0x603/0x7e0
? __pfx_tmigr_handle_remote_up+0x10/0x10
? sched_balance_trigger+0x98/0x9f0
? sched_tick+0x221/0x5a0
? _raw_spin_lock_irq+0x80/0xe0
? __pfx__raw_spin_lock_irq+0x10/0x10
? tick_nohz_handler+0x339/0x440
? __pfx_tmigr_handle_remote_up+0x10/0x10
__walk_groups.isra.0+0x42/0x150
tmigr_handle_remote+0x1f4/0x2e0
? __pfx_tmigr_handle_remote+0x10/0x10
? ktime_get+0x60/0x140
? lapic_next_event+0x11/0x20
? clockevents_program_event+0x1d4/0x2a0
? hrtimer_interrupt+0x322/0x780
handle_softirqs+0x16a/0x550
irq_exit_rcu+0xaf/0xe0
sysvec_apic_timer_interrupt+0x70/0x80
</IRQ>
...
Allocated by task 141:
kasan_save_stack+0x24/0x50
kasan_save_track+0x14/0x30
__kasan_kmalloc+0x7f/0x90
__kmalloc_node_track_caller_noprof+0x198/0x430
devm_kmalloc+0x7b/0x1e0
tc358743_probe+0xb7/0x610 i2c_device_probe+0x51d/0x880
really_probe+0x1ca/0x5c0
__driver_probe_device+0x248/0x310
driver_probe_device+0x44/0x120
__device_attach_driver+0x174/0x220
bus_for_each_drv+0x100/0x190
__device_attach+0x206/0x370
bus_probe_device+0x123/0x170
device_add+0xd25/0x1470
i2c_new_client_device+0x7a0/0xcd0
do_one_initcall+0x89/0x300
do_init_module+0x29d/0x7f0
load_module+0x4f48/0x69e0
init_module_from_file+0xe4/0x150
idempotent_init_module+0x320/0x670
__x64_sys_finit_module+0xbd/0x120
do_syscall_64+0xac/0x280
entry_SYSCALL_64_after_hwframe+0x77/0x7f
Freed by task 141:
kasan_save_stack+0x24/0x50
kasan_save_track+0x14/0x30
kasan_save_free_info+0x3a/0x60
__kasan_slab_free+0x3f/0x50
kfree+0x137/0x370
release_nodes+0xa4/0x100
devres_release_group+0x1b2/0x380
i2c_device_probe+0x694/0x880
really_probe+0x1ca/0x5c0
__driver_probe_device+0x248/0x310
driver_probe_device+0x44/0x120
__device_attach_driver+0x174/0x220
bus_for_each_drv+0x100/0x190
__device_attach+0x206/0x370
bus_probe_device+0x123/0x170
device_add+0xd25/0x1470
i2c_new_client_device+0x7a0/0xcd0
do_one_initcall+0x89/0x300
do_init_module+0x29d/0x7f0
load_module+0x4f48/0x69e0
init_module_from_file+0xe4/0x150
idempotent_init_module+0x320/0x670
__x64_sys_finit_module+0xbd/0x120
do_syscall_64+0xac/0x280
entry_SYSCALL_64_after_hwframe+0x77/0x7f
...
Replace timer_delete() with timer_delete_sync() and cancel_delayed_work()
with cancel_delayed_work_sync() to ensure proper termination of timer and
work items before resource cleanup.
This bug was initially identified through static analysis. For reproduction
and testing, I created a functional emulation of the tc358743 device via a
kernel module and introduced faults through the debugfs interface.
Fixes: 869f38ae07f7 ("media: i2c: tc358743: Fix crash in the probe error path when using polling")
Fixes: d32d98642de6 ("[media] Driver for Toshiba TC358743 HDMI to CSI-2 bridge")
Cc: stable(a)vger.kernel.org
Signed-off-by: Duoming Zhou <duoming(a)zju.edu.cn>
Signed-off-by: Hans Verkuil <hverkuil+cisco(a)kernel.org>
diff --git a/drivers/media/i2c/tc358743.c b/drivers/media/i2c/tc358743.c
index aa02a5a6ae3e..a0ca19359c43 100644
--- a/drivers/media/i2c/tc358743.c
+++ b/drivers/media/i2c/tc358743.c
@@ -2326,10 +2326,10 @@ static int tc358743_probe(struct i2c_client *client)
err_work_queues:
cec_unregister_adapter(state->cec_adap);
if (!state->i2c_client->irq) {
- timer_delete(&state->timer);
+ timer_delete_sync(&state->timer);
flush_work(&state->work_i2c_poll);
}
- cancel_delayed_work(&state->delayed_work_enable_hotplug);
+ cancel_delayed_work_sync(&state->delayed_work_enable_hotplug);
mutex_destroy(&state->confctl_mutex);
err_hdl:
media_entity_cleanup(&sd->entity);
DAMON sysfs interface dynamically allocates and uses a damon_ctx object
for testing if given inputs for online DAMON parameters update is valid.
The object is being used without an allocation failure check, and leaked
when the test succeeds. Fix the two bugs.
SeongJae Park (2):
mm/damon/sysfs: catch commit test ctx alloc failure
mm/damon/sysfs: dealloc commit test ctx always
mm/damon/sysfs.c | 7 ++++---
1 file changed, 4 insertions(+), 3 deletions(-)
base-commit: 3c39180d389ca58cf309b7aa58b6a3617151c226
--
2.39.5
The patch titled
Subject: fsnotify: pass correct offset to fsnotify_mmap_perm()
has been added to the -mm mm-hotfixes-unstable branch. Its filename is
fsnotify-pass-correct-offset-to-fsnotify_mmap_perm.patch
This patch will shortly appear at
https://git.kernel.org/pub/scm/linux/kernel/git/akpm/25-new.git/tree/patche…
This patch will later appear in the mm-hotfixes-unstable branch at
git://git.kernel.org/pub/scm/linux/kernel/git/akpm/mm
Before you just go and hit "reply", please:
a) Consider who else should be cc'ed
b) Prefer to cc a suitable mailing list as well
c) Ideally: find the original patch on the mailing list and do a
reply-to-all to that, adding suitable additional cc's
*** Remember to use Documentation/process/submit-checklist.rst when testing your code ***
The -mm tree is included into linux-next via the mm-everything
branch at git://git.kernel.org/pub/scm/linux/kernel/git/akpm/mm
and is updated there every 2-3 working days
------------------------------------------------------
From: Ryan Roberts <ryan.roberts(a)arm.com>
Subject: fsnotify: pass correct offset to fsnotify_mmap_perm()
Date: Fri, 3 Oct 2025 16:52:36 +0100
fsnotify_mmap_perm() requires a byte offset for the file about to be
mmap'ed. But it is called from vm_mmap_pgoff(), which has a page offset.
Previously the conversion was done incorrectly so let's fix it, being
careful not to overflow on 32-bit platforms.
Discovered during code review.
Link: https://lkml.kernel.org/r/20251003155238.2147410-1-ryan.roberts@arm.com
Fixes: 066e053fe208 ("fsnotify: add pre-content hooks on mmap()")
Signed-off-by: Ryan Roberts <ryan.roberts(a)arm.com>
Reviewed-by: Kiryl Shutsemau <kas(a)kernel.org>
Cc: Amir Goldstein <amir73il(a)gmail.com>
Cc: David Hildenbrand <david(a)redhat.com>
Cc: Liam Howlett <liam.howlett(a)oracle.com>
Cc: Lorenzo Stoakes <lorenzo.stoakes(a)oracle.com>
Cc: Michal Hocko <mhocko(a)suse.com>
Cc: Mike Rapoport <rppt(a)kernel.org>
Cc: Suren Baghdasaryan <surenb(a)google.com>
Cc: Vlastimil Babka <vbabka(a)suse.cz>
Cc: <stable(a)vger.kernel.org>
Signed-off-by: Andrew Morton <akpm(a)linux-foundation.org>
---
mm/util.c | 3 ++-
1 file changed, 2 insertions(+), 1 deletion(-)
--- a/mm/util.c~fsnotify-pass-correct-offset-to-fsnotify_mmap_perm
+++ a/mm/util.c
@@ -566,6 +566,7 @@ unsigned long vm_mmap_pgoff(struct file
unsigned long len, unsigned long prot,
unsigned long flag, unsigned long pgoff)
{
+ loff_t off = (loff_t)pgoff << PAGE_SHIFT;
unsigned long ret;
struct mm_struct *mm = current->mm;
unsigned long populate;
@@ -573,7 +574,7 @@ unsigned long vm_mmap_pgoff(struct file
ret = security_mmap_file(file, prot, flag);
if (!ret)
- ret = fsnotify_mmap_perm(file, prot, pgoff >> PAGE_SHIFT, len);
+ ret = fsnotify_mmap_perm(file, prot, off, len);
if (!ret) {
if (mmap_write_lock_killable(mm))
return -EINTR;
_
Patches currently in -mm which might be from ryan.roberts(a)arm.com are
fsnotify-pass-correct-offset-to-fsnotify_mmap_perm.patch
The patch below does not apply to the 5.10-stable tree.
If someone wants it applied there, or to any other stable or longterm
tree, then please email the backport, including the original git commit
id to <stable(a)vger.kernel.org>.
To reproduce the conflict and resubmit, you may use the following commands:
git fetch https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git/ linux-5.10.y
git checkout FETCH_HEAD
git cherry-pick -x 79d10f4f21a92e459b2276a77be62c59c1502c9d
# <resolve conflicts, build, test, etc.>
git commit -s
git send-email --to '<stable(a)vger.kernel.org>' --in-reply-to '2025100332-oblivion-shun-2bd3@gregkh' --subject-prefix 'PATCH 5.10.y' HEAD^..
Possible dependencies:
thanks,
greg k-h
------------------ original commit in Linus's tree ------------------
From 79d10f4f21a92e459b2276a77be62c59c1502c9d Mon Sep 17 00:00:00 2001
From: Duoming Zhou <duoming(a)zju.edu.cn>
Date: Wed, 17 Sep 2025 17:57:42 +0800
Subject: [PATCH] media: i2c: tc358743: Fix use-after-free bugs caused by
orphan timer in probe
The state->timer is a cyclic timer that schedules work_i2c_poll and
delayed_work_enable_hotplug, while rearming itself. Using timer_delete()
fails to guarantee the timer isn't still running when destroyed, similarly
cancel_delayed_work() cannot ensure delayed_work_enable_hotplug has
terminated if already executing. During probe failure after timer
initialization, these may continue running as orphans and reference the
already-freed tc358743_state object through tc358743_irq_poll_timer.
The following is the trace captured by KASAN.
BUG: KASAN: slab-use-after-free in __run_timer_base.part.0+0x7d7/0x8c0
Write of size 8 at addr ffff88800ded83c8 by task swapper/1/0
...
Call Trace:
<IRQ>
dump_stack_lvl+0x55/0x70
print_report+0xcf/0x610
? __pfx_sched_balance_find_src_group+0x10/0x10
? __run_timer_base.part.0+0x7d7/0x8c0
kasan_report+0xb8/0xf0
? __run_timer_base.part.0+0x7d7/0x8c0
__run_timer_base.part.0+0x7d7/0x8c0
? rcu_sched_clock_irq+0xb06/0x27d0
? __pfx___run_timer_base.part.0+0x10/0x10
? try_to_wake_up+0xb15/0x1960
? tmigr_update_events+0x280/0x740
? _raw_spin_lock_irq+0x80/0xe0
? __pfx__raw_spin_lock_irq+0x10/0x10
tmigr_handle_remote_up+0x603/0x7e0
? __pfx_tmigr_handle_remote_up+0x10/0x10
? sched_balance_trigger+0x98/0x9f0
? sched_tick+0x221/0x5a0
? _raw_spin_lock_irq+0x80/0xe0
? __pfx__raw_spin_lock_irq+0x10/0x10
? tick_nohz_handler+0x339/0x440
? __pfx_tmigr_handle_remote_up+0x10/0x10
__walk_groups.isra.0+0x42/0x150
tmigr_handle_remote+0x1f4/0x2e0
? __pfx_tmigr_handle_remote+0x10/0x10
? ktime_get+0x60/0x140
? lapic_next_event+0x11/0x20
? clockevents_program_event+0x1d4/0x2a0
? hrtimer_interrupt+0x322/0x780
handle_softirqs+0x16a/0x550
irq_exit_rcu+0xaf/0xe0
sysvec_apic_timer_interrupt+0x70/0x80
</IRQ>
...
Allocated by task 141:
kasan_save_stack+0x24/0x50
kasan_save_track+0x14/0x30
__kasan_kmalloc+0x7f/0x90
__kmalloc_node_track_caller_noprof+0x198/0x430
devm_kmalloc+0x7b/0x1e0
tc358743_probe+0xb7/0x610 i2c_device_probe+0x51d/0x880
really_probe+0x1ca/0x5c0
__driver_probe_device+0x248/0x310
driver_probe_device+0x44/0x120
__device_attach_driver+0x174/0x220
bus_for_each_drv+0x100/0x190
__device_attach+0x206/0x370
bus_probe_device+0x123/0x170
device_add+0xd25/0x1470
i2c_new_client_device+0x7a0/0xcd0
do_one_initcall+0x89/0x300
do_init_module+0x29d/0x7f0
load_module+0x4f48/0x69e0
init_module_from_file+0xe4/0x150
idempotent_init_module+0x320/0x670
__x64_sys_finit_module+0xbd/0x120
do_syscall_64+0xac/0x280
entry_SYSCALL_64_after_hwframe+0x77/0x7f
Freed by task 141:
kasan_save_stack+0x24/0x50
kasan_save_track+0x14/0x30
kasan_save_free_info+0x3a/0x60
__kasan_slab_free+0x3f/0x50
kfree+0x137/0x370
release_nodes+0xa4/0x100
devres_release_group+0x1b2/0x380
i2c_device_probe+0x694/0x880
really_probe+0x1ca/0x5c0
__driver_probe_device+0x248/0x310
driver_probe_device+0x44/0x120
__device_attach_driver+0x174/0x220
bus_for_each_drv+0x100/0x190
__device_attach+0x206/0x370
bus_probe_device+0x123/0x170
device_add+0xd25/0x1470
i2c_new_client_device+0x7a0/0xcd0
do_one_initcall+0x89/0x300
do_init_module+0x29d/0x7f0
load_module+0x4f48/0x69e0
init_module_from_file+0xe4/0x150
idempotent_init_module+0x320/0x670
__x64_sys_finit_module+0xbd/0x120
do_syscall_64+0xac/0x280
entry_SYSCALL_64_after_hwframe+0x77/0x7f
...
Replace timer_delete() with timer_delete_sync() and cancel_delayed_work()
with cancel_delayed_work_sync() to ensure proper termination of timer and
work items before resource cleanup.
This bug was initially identified through static analysis. For reproduction
and testing, I created a functional emulation of the tc358743 device via a
kernel module and introduced faults through the debugfs interface.
Fixes: 869f38ae07f7 ("media: i2c: tc358743: Fix crash in the probe error path when using polling")
Fixes: d32d98642de6 ("[media] Driver for Toshiba TC358743 HDMI to CSI-2 bridge")
Cc: stable(a)vger.kernel.org
Signed-off-by: Duoming Zhou <duoming(a)zju.edu.cn>
Signed-off-by: Hans Verkuil <hverkuil+cisco(a)kernel.org>
diff --git a/drivers/media/i2c/tc358743.c b/drivers/media/i2c/tc358743.c
index aa02a5a6ae3e..a0ca19359c43 100644
--- a/drivers/media/i2c/tc358743.c
+++ b/drivers/media/i2c/tc358743.c
@@ -2326,10 +2326,10 @@ static int tc358743_probe(struct i2c_client *client)
err_work_queues:
cec_unregister_adapter(state->cec_adap);
if (!state->i2c_client->irq) {
- timer_delete(&state->timer);
+ timer_delete_sync(&state->timer);
flush_work(&state->work_i2c_poll);
}
- cancel_delayed_work(&state->delayed_work_enable_hotplug);
+ cancel_delayed_work_sync(&state->delayed_work_enable_hotplug);
mutex_destroy(&state->confctl_mutex);
err_hdl:
media_entity_cleanup(&sd->entity);
The patch below does not apply to the 6.6-stable tree.
If someone wants it applied there, or to any other stable or longterm
tree, then please email the backport, including the original git commit
id to <stable(a)vger.kernel.org>.
To reproduce the conflict and resubmit, you may use the following commands:
git fetch https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git/ linux-6.6.y
git checkout FETCH_HEAD
git cherry-pick -x 40b7a19f321e65789612ebaca966472055dab48c
# <resolve conflicts, build, test, etc.>
git commit -s
git send-email --to '<stable(a)vger.kernel.org>' --in-reply-to '2025100338-ambulance-swaddling-4b2b@gregkh' --subject-prefix 'PATCH 6.6.y' HEAD^..
Possible dependencies:
thanks,
greg k-h
------------------ original commit in Linus's tree ------------------
From 40b7a19f321e65789612ebaca966472055dab48c Mon Sep 17 00:00:00 2001
From: Duoming Zhou <duoming(a)zju.edu.cn>
Date: Wed, 17 Sep 2025 17:56:08 +0800
Subject: [PATCH] media: tuner: xc5000: Fix use-after-free in xc5000_release
The original code uses cancel_delayed_work() in xc5000_release(), which
does not guarantee that the delayed work item timer_sleep has fully
completed if it was already running. This leads to use-after-free scenarios
where xc5000_release() may free the xc5000_priv while timer_sleep is still
active and attempts to dereference the xc5000_priv.
A typical race condition is illustrated below:
CPU 0 (release thread) | CPU 1 (delayed work callback)
xc5000_release() | xc5000_do_timer_sleep()
cancel_delayed_work() |
hybrid_tuner_release_state(priv) |
kfree(priv) |
| priv = container_of() // UAF
Replace cancel_delayed_work() with cancel_delayed_work_sync() to ensure
that the timer_sleep is properly canceled before the xc5000_priv memory
is deallocated.
A deadlock concern was considered: xc5000_release() is called in a process
context and is not holding any locks that the timer_sleep work item might
also need. Therefore, the use of the _sync() variant is safe here.
This bug was initially identified through static analysis.
Fixes: f7a27ff1fb77 ("[media] xc5000: delay tuner sleep to 5 seconds")
Cc: stable(a)vger.kernel.org
Signed-off-by: Duoming Zhou <duoming(a)zju.edu.cn>
Signed-off-by: Hans Verkuil <hverkuil+cisco(a)kernel.org>
[hverkuil: fix typo in Subject: tunner -> tuner]
diff --git a/drivers/media/tuners/xc5000.c b/drivers/media/tuners/xc5000.c
index bf4ff461e082..a28481edd22e 100644
--- a/drivers/media/tuners/xc5000.c
+++ b/drivers/media/tuners/xc5000.c
@@ -1304,7 +1304,7 @@ static void xc5000_release(struct dvb_frontend *fe)
mutex_lock(&xc5000_list_mutex);
if (priv) {
- cancel_delayed_work(&priv->timer_sleep);
+ cancel_delayed_work_sync(&priv->timer_sleep);
hybrid_tuner_release_state(priv);
}
Dear Kernel maintainers,
I think i'm encountering (for the first time in years !) a regression
with the "6.7.arch3-1" kernel (whereas no issues with
"6.6.10.arch1-1", on which i reverted).
I'm running a (up-to-date, and non-LTS) ARCHLINUX desktop, on a ASUS
B560-I motherboard, with 3 monitors (attached to a 4-HDMI outputs
card), plus an audio S/PDIF optic output at motherboard level.
With the latest kernel, the S/PIDF optic output of the motherboard is
NOT detected anymore (and i haven't been able to see / find anything
in the logs at quick glance, neither journalctl -xe nor dmesg).
Once reverted to 6.6.10, everything is fine again.
For example, in a working situation (6.6.10), i have :
cat /proc/asound/pcm
00-00: ALC1220 Analog : ALC1220 Analog : playback 1 : capture 1
00-01: ALC1220 Digital : ALC1220 Digital : playback 1
00-02: ALC1220 Alt Analog : ALC1220 Alt Analog : capture 1
01-03: HDMI 0 : HDMI 0 : playback 1
01-07: HDMI 1 : HDMI 1 : playback 1
01-08: HDMI 2 : HDMI 2 : playback 1
01-09: HDMI 3 : HDMI 3 : playback 1
Whereas while on the latest 6.7 kernel, i only had the 4 HDMI lines
(linked to a NVIDIA T600 card, with 4 HDMI outputs) and not the three
first ones (attached to the motherboard).
(of course i did several tests with 6.7, reboot, ... without any changes)
Any idea ?
Best regards
--
Serge.
The patch below does not apply to the 5.15-stable tree.
If someone wants it applied there, or to any other stable or longterm
tree, then please email the backport, including the original git commit
id to <stable(a)vger.kernel.org>.
To reproduce the conflict and resubmit, you may use the following commands:
git fetch https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git/ linux-5.15.y
git checkout FETCH_HEAD
git cherry-pick -x 79d10f4f21a92e459b2276a77be62c59c1502c9d
# <resolve conflicts, build, test, etc.>
git commit -s
git send-email --to '<stable(a)vger.kernel.org>' --in-reply-to '2025100331-junior-federal-3e04@gregkh' --subject-prefix 'PATCH 5.15.y' HEAD^..
Possible dependencies:
thanks,
greg k-h
------------------ original commit in Linus's tree ------------------
From 79d10f4f21a92e459b2276a77be62c59c1502c9d Mon Sep 17 00:00:00 2001
From: Duoming Zhou <duoming(a)zju.edu.cn>
Date: Wed, 17 Sep 2025 17:57:42 +0800
Subject: [PATCH] media: i2c: tc358743: Fix use-after-free bugs caused by
orphan timer in probe
The state->timer is a cyclic timer that schedules work_i2c_poll and
delayed_work_enable_hotplug, while rearming itself. Using timer_delete()
fails to guarantee the timer isn't still running when destroyed, similarly
cancel_delayed_work() cannot ensure delayed_work_enable_hotplug has
terminated if already executing. During probe failure after timer
initialization, these may continue running as orphans and reference the
already-freed tc358743_state object through tc358743_irq_poll_timer.
The following is the trace captured by KASAN.
BUG: KASAN: slab-use-after-free in __run_timer_base.part.0+0x7d7/0x8c0
Write of size 8 at addr ffff88800ded83c8 by task swapper/1/0
...
Call Trace:
<IRQ>
dump_stack_lvl+0x55/0x70
print_report+0xcf/0x610
? __pfx_sched_balance_find_src_group+0x10/0x10
? __run_timer_base.part.0+0x7d7/0x8c0
kasan_report+0xb8/0xf0
? __run_timer_base.part.0+0x7d7/0x8c0
__run_timer_base.part.0+0x7d7/0x8c0
? rcu_sched_clock_irq+0xb06/0x27d0
? __pfx___run_timer_base.part.0+0x10/0x10
? try_to_wake_up+0xb15/0x1960
? tmigr_update_events+0x280/0x740
? _raw_spin_lock_irq+0x80/0xe0
? __pfx__raw_spin_lock_irq+0x10/0x10
tmigr_handle_remote_up+0x603/0x7e0
? __pfx_tmigr_handle_remote_up+0x10/0x10
? sched_balance_trigger+0x98/0x9f0
? sched_tick+0x221/0x5a0
? _raw_spin_lock_irq+0x80/0xe0
? __pfx__raw_spin_lock_irq+0x10/0x10
? tick_nohz_handler+0x339/0x440
? __pfx_tmigr_handle_remote_up+0x10/0x10
__walk_groups.isra.0+0x42/0x150
tmigr_handle_remote+0x1f4/0x2e0
? __pfx_tmigr_handle_remote+0x10/0x10
? ktime_get+0x60/0x140
? lapic_next_event+0x11/0x20
? clockevents_program_event+0x1d4/0x2a0
? hrtimer_interrupt+0x322/0x780
handle_softirqs+0x16a/0x550
irq_exit_rcu+0xaf/0xe0
sysvec_apic_timer_interrupt+0x70/0x80
</IRQ>
...
Allocated by task 141:
kasan_save_stack+0x24/0x50
kasan_save_track+0x14/0x30
__kasan_kmalloc+0x7f/0x90
__kmalloc_node_track_caller_noprof+0x198/0x430
devm_kmalloc+0x7b/0x1e0
tc358743_probe+0xb7/0x610 i2c_device_probe+0x51d/0x880
really_probe+0x1ca/0x5c0
__driver_probe_device+0x248/0x310
driver_probe_device+0x44/0x120
__device_attach_driver+0x174/0x220
bus_for_each_drv+0x100/0x190
__device_attach+0x206/0x370
bus_probe_device+0x123/0x170
device_add+0xd25/0x1470
i2c_new_client_device+0x7a0/0xcd0
do_one_initcall+0x89/0x300
do_init_module+0x29d/0x7f0
load_module+0x4f48/0x69e0
init_module_from_file+0xe4/0x150
idempotent_init_module+0x320/0x670
__x64_sys_finit_module+0xbd/0x120
do_syscall_64+0xac/0x280
entry_SYSCALL_64_after_hwframe+0x77/0x7f
Freed by task 141:
kasan_save_stack+0x24/0x50
kasan_save_track+0x14/0x30
kasan_save_free_info+0x3a/0x60
__kasan_slab_free+0x3f/0x50
kfree+0x137/0x370
release_nodes+0xa4/0x100
devres_release_group+0x1b2/0x380
i2c_device_probe+0x694/0x880
really_probe+0x1ca/0x5c0
__driver_probe_device+0x248/0x310
driver_probe_device+0x44/0x120
__device_attach_driver+0x174/0x220
bus_for_each_drv+0x100/0x190
__device_attach+0x206/0x370
bus_probe_device+0x123/0x170
device_add+0xd25/0x1470
i2c_new_client_device+0x7a0/0xcd0
do_one_initcall+0x89/0x300
do_init_module+0x29d/0x7f0
load_module+0x4f48/0x69e0
init_module_from_file+0xe4/0x150
idempotent_init_module+0x320/0x670
__x64_sys_finit_module+0xbd/0x120
do_syscall_64+0xac/0x280
entry_SYSCALL_64_after_hwframe+0x77/0x7f
...
Replace timer_delete() with timer_delete_sync() and cancel_delayed_work()
with cancel_delayed_work_sync() to ensure proper termination of timer and
work items before resource cleanup.
This bug was initially identified through static analysis. For reproduction
and testing, I created a functional emulation of the tc358743 device via a
kernel module and introduced faults through the debugfs interface.
Fixes: 869f38ae07f7 ("media: i2c: tc358743: Fix crash in the probe error path when using polling")
Fixes: d32d98642de6 ("[media] Driver for Toshiba TC358743 HDMI to CSI-2 bridge")
Cc: stable(a)vger.kernel.org
Signed-off-by: Duoming Zhou <duoming(a)zju.edu.cn>
Signed-off-by: Hans Verkuil <hverkuil+cisco(a)kernel.org>
diff --git a/drivers/media/i2c/tc358743.c b/drivers/media/i2c/tc358743.c
index aa02a5a6ae3e..a0ca19359c43 100644
--- a/drivers/media/i2c/tc358743.c
+++ b/drivers/media/i2c/tc358743.c
@@ -2326,10 +2326,10 @@ static int tc358743_probe(struct i2c_client *client)
err_work_queues:
cec_unregister_adapter(state->cec_adap);
if (!state->i2c_client->irq) {
- timer_delete(&state->timer);
+ timer_delete_sync(&state->timer);
flush_work(&state->work_i2c_poll);
}
- cancel_delayed_work(&state->delayed_work_enable_hotplug);
+ cancel_delayed_work_sync(&state->delayed_work_enable_hotplug);
mutex_destroy(&state->confctl_mutex);
err_hdl:
media_entity_cleanup(&sd->entity);
The patch below does not apply to the 6.1-stable tree.
If someone wants it applied there, or to any other stable or longterm
tree, then please email the backport, including the original git commit
id to <stable(a)vger.kernel.org>.
To reproduce the conflict and resubmit, you may use the following commands:
git fetch https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git/ linux-6.1.y
git checkout FETCH_HEAD
git cherry-pick -x 79d10f4f21a92e459b2276a77be62c59c1502c9d
# <resolve conflicts, build, test, etc.>
git commit -s
git send-email --to '<stable(a)vger.kernel.org>' --in-reply-to '2025100330-bootie-slurp-7058@gregkh' --subject-prefix 'PATCH 6.1.y' HEAD^..
Possible dependencies:
thanks,
greg k-h
------------------ original commit in Linus's tree ------------------
From 79d10f4f21a92e459b2276a77be62c59c1502c9d Mon Sep 17 00:00:00 2001
From: Duoming Zhou <duoming(a)zju.edu.cn>
Date: Wed, 17 Sep 2025 17:57:42 +0800
Subject: [PATCH] media: i2c: tc358743: Fix use-after-free bugs caused by
orphan timer in probe
The state->timer is a cyclic timer that schedules work_i2c_poll and
delayed_work_enable_hotplug, while rearming itself. Using timer_delete()
fails to guarantee the timer isn't still running when destroyed, similarly
cancel_delayed_work() cannot ensure delayed_work_enable_hotplug has
terminated if already executing. During probe failure after timer
initialization, these may continue running as orphans and reference the
already-freed tc358743_state object through tc358743_irq_poll_timer.
The following is the trace captured by KASAN.
BUG: KASAN: slab-use-after-free in __run_timer_base.part.0+0x7d7/0x8c0
Write of size 8 at addr ffff88800ded83c8 by task swapper/1/0
...
Call Trace:
<IRQ>
dump_stack_lvl+0x55/0x70
print_report+0xcf/0x610
? __pfx_sched_balance_find_src_group+0x10/0x10
? __run_timer_base.part.0+0x7d7/0x8c0
kasan_report+0xb8/0xf0
? __run_timer_base.part.0+0x7d7/0x8c0
__run_timer_base.part.0+0x7d7/0x8c0
? rcu_sched_clock_irq+0xb06/0x27d0
? __pfx___run_timer_base.part.0+0x10/0x10
? try_to_wake_up+0xb15/0x1960
? tmigr_update_events+0x280/0x740
? _raw_spin_lock_irq+0x80/0xe0
? __pfx__raw_spin_lock_irq+0x10/0x10
tmigr_handle_remote_up+0x603/0x7e0
? __pfx_tmigr_handle_remote_up+0x10/0x10
? sched_balance_trigger+0x98/0x9f0
? sched_tick+0x221/0x5a0
? _raw_spin_lock_irq+0x80/0xe0
? __pfx__raw_spin_lock_irq+0x10/0x10
? tick_nohz_handler+0x339/0x440
? __pfx_tmigr_handle_remote_up+0x10/0x10
__walk_groups.isra.0+0x42/0x150
tmigr_handle_remote+0x1f4/0x2e0
? __pfx_tmigr_handle_remote+0x10/0x10
? ktime_get+0x60/0x140
? lapic_next_event+0x11/0x20
? clockevents_program_event+0x1d4/0x2a0
? hrtimer_interrupt+0x322/0x780
handle_softirqs+0x16a/0x550
irq_exit_rcu+0xaf/0xe0
sysvec_apic_timer_interrupt+0x70/0x80
</IRQ>
...
Allocated by task 141:
kasan_save_stack+0x24/0x50
kasan_save_track+0x14/0x30
__kasan_kmalloc+0x7f/0x90
__kmalloc_node_track_caller_noprof+0x198/0x430
devm_kmalloc+0x7b/0x1e0
tc358743_probe+0xb7/0x610 i2c_device_probe+0x51d/0x880
really_probe+0x1ca/0x5c0
__driver_probe_device+0x248/0x310
driver_probe_device+0x44/0x120
__device_attach_driver+0x174/0x220
bus_for_each_drv+0x100/0x190
__device_attach+0x206/0x370
bus_probe_device+0x123/0x170
device_add+0xd25/0x1470
i2c_new_client_device+0x7a0/0xcd0
do_one_initcall+0x89/0x300
do_init_module+0x29d/0x7f0
load_module+0x4f48/0x69e0
init_module_from_file+0xe4/0x150
idempotent_init_module+0x320/0x670
__x64_sys_finit_module+0xbd/0x120
do_syscall_64+0xac/0x280
entry_SYSCALL_64_after_hwframe+0x77/0x7f
Freed by task 141:
kasan_save_stack+0x24/0x50
kasan_save_track+0x14/0x30
kasan_save_free_info+0x3a/0x60
__kasan_slab_free+0x3f/0x50
kfree+0x137/0x370
release_nodes+0xa4/0x100
devres_release_group+0x1b2/0x380
i2c_device_probe+0x694/0x880
really_probe+0x1ca/0x5c0
__driver_probe_device+0x248/0x310
driver_probe_device+0x44/0x120
__device_attach_driver+0x174/0x220
bus_for_each_drv+0x100/0x190
__device_attach+0x206/0x370
bus_probe_device+0x123/0x170
device_add+0xd25/0x1470
i2c_new_client_device+0x7a0/0xcd0
do_one_initcall+0x89/0x300
do_init_module+0x29d/0x7f0
load_module+0x4f48/0x69e0
init_module_from_file+0xe4/0x150
idempotent_init_module+0x320/0x670
__x64_sys_finit_module+0xbd/0x120
do_syscall_64+0xac/0x280
entry_SYSCALL_64_after_hwframe+0x77/0x7f
...
Replace timer_delete() with timer_delete_sync() and cancel_delayed_work()
with cancel_delayed_work_sync() to ensure proper termination of timer and
work items before resource cleanup.
This bug was initially identified through static analysis. For reproduction
and testing, I created a functional emulation of the tc358743 device via a
kernel module and introduced faults through the debugfs interface.
Fixes: 869f38ae07f7 ("media: i2c: tc358743: Fix crash in the probe error path when using polling")
Fixes: d32d98642de6 ("[media] Driver for Toshiba TC358743 HDMI to CSI-2 bridge")
Cc: stable(a)vger.kernel.org
Signed-off-by: Duoming Zhou <duoming(a)zju.edu.cn>
Signed-off-by: Hans Verkuil <hverkuil+cisco(a)kernel.org>
diff --git a/drivers/media/i2c/tc358743.c b/drivers/media/i2c/tc358743.c
index aa02a5a6ae3e..a0ca19359c43 100644
--- a/drivers/media/i2c/tc358743.c
+++ b/drivers/media/i2c/tc358743.c
@@ -2326,10 +2326,10 @@ static int tc358743_probe(struct i2c_client *client)
err_work_queues:
cec_unregister_adapter(state->cec_adap);
if (!state->i2c_client->irq) {
- timer_delete(&state->timer);
+ timer_delete_sync(&state->timer);
flush_work(&state->work_i2c_poll);
}
- cancel_delayed_work(&state->delayed_work_enable_hotplug);
+ cancel_delayed_work_sync(&state->delayed_work_enable_hotplug);
mutex_destroy(&state->confctl_mutex);
err_hdl:
media_entity_cleanup(&sd->entity);
The patch below does not apply to the 6.6-stable tree.
If someone wants it applied there, or to any other stable or longterm
tree, then please email the backport, including the original git commit
id to <stable(a)vger.kernel.org>.
To reproduce the conflict and resubmit, you may use the following commands:
git fetch https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git/ linux-6.6.y
git checkout FETCH_HEAD
git cherry-pick -x 79d10f4f21a92e459b2276a77be62c59c1502c9d
# <resolve conflicts, build, test, etc.>
git commit -s
git send-email --to '<stable(a)vger.kernel.org>' --in-reply-to '2025100329-icy-unbroken-b3bb@gregkh' --subject-prefix 'PATCH 6.6.y' HEAD^..
Possible dependencies:
thanks,
greg k-h
------------------ original commit in Linus's tree ------------------
From 79d10f4f21a92e459b2276a77be62c59c1502c9d Mon Sep 17 00:00:00 2001
From: Duoming Zhou <duoming(a)zju.edu.cn>
Date: Wed, 17 Sep 2025 17:57:42 +0800
Subject: [PATCH] media: i2c: tc358743: Fix use-after-free bugs caused by
orphan timer in probe
The state->timer is a cyclic timer that schedules work_i2c_poll and
delayed_work_enable_hotplug, while rearming itself. Using timer_delete()
fails to guarantee the timer isn't still running when destroyed, similarly
cancel_delayed_work() cannot ensure delayed_work_enable_hotplug has
terminated if already executing. During probe failure after timer
initialization, these may continue running as orphans and reference the
already-freed tc358743_state object through tc358743_irq_poll_timer.
The following is the trace captured by KASAN.
BUG: KASAN: slab-use-after-free in __run_timer_base.part.0+0x7d7/0x8c0
Write of size 8 at addr ffff88800ded83c8 by task swapper/1/0
...
Call Trace:
<IRQ>
dump_stack_lvl+0x55/0x70
print_report+0xcf/0x610
? __pfx_sched_balance_find_src_group+0x10/0x10
? __run_timer_base.part.0+0x7d7/0x8c0
kasan_report+0xb8/0xf0
? __run_timer_base.part.0+0x7d7/0x8c0
__run_timer_base.part.0+0x7d7/0x8c0
? rcu_sched_clock_irq+0xb06/0x27d0
? __pfx___run_timer_base.part.0+0x10/0x10
? try_to_wake_up+0xb15/0x1960
? tmigr_update_events+0x280/0x740
? _raw_spin_lock_irq+0x80/0xe0
? __pfx__raw_spin_lock_irq+0x10/0x10
tmigr_handle_remote_up+0x603/0x7e0
? __pfx_tmigr_handle_remote_up+0x10/0x10
? sched_balance_trigger+0x98/0x9f0
? sched_tick+0x221/0x5a0
? _raw_spin_lock_irq+0x80/0xe0
? __pfx__raw_spin_lock_irq+0x10/0x10
? tick_nohz_handler+0x339/0x440
? __pfx_tmigr_handle_remote_up+0x10/0x10
__walk_groups.isra.0+0x42/0x150
tmigr_handle_remote+0x1f4/0x2e0
? __pfx_tmigr_handle_remote+0x10/0x10
? ktime_get+0x60/0x140
? lapic_next_event+0x11/0x20
? clockevents_program_event+0x1d4/0x2a0
? hrtimer_interrupt+0x322/0x780
handle_softirqs+0x16a/0x550
irq_exit_rcu+0xaf/0xe0
sysvec_apic_timer_interrupt+0x70/0x80
</IRQ>
...
Allocated by task 141:
kasan_save_stack+0x24/0x50
kasan_save_track+0x14/0x30
__kasan_kmalloc+0x7f/0x90
__kmalloc_node_track_caller_noprof+0x198/0x430
devm_kmalloc+0x7b/0x1e0
tc358743_probe+0xb7/0x610 i2c_device_probe+0x51d/0x880
really_probe+0x1ca/0x5c0
__driver_probe_device+0x248/0x310
driver_probe_device+0x44/0x120
__device_attach_driver+0x174/0x220
bus_for_each_drv+0x100/0x190
__device_attach+0x206/0x370
bus_probe_device+0x123/0x170
device_add+0xd25/0x1470
i2c_new_client_device+0x7a0/0xcd0
do_one_initcall+0x89/0x300
do_init_module+0x29d/0x7f0
load_module+0x4f48/0x69e0
init_module_from_file+0xe4/0x150
idempotent_init_module+0x320/0x670
__x64_sys_finit_module+0xbd/0x120
do_syscall_64+0xac/0x280
entry_SYSCALL_64_after_hwframe+0x77/0x7f
Freed by task 141:
kasan_save_stack+0x24/0x50
kasan_save_track+0x14/0x30
kasan_save_free_info+0x3a/0x60
__kasan_slab_free+0x3f/0x50
kfree+0x137/0x370
release_nodes+0xa4/0x100
devres_release_group+0x1b2/0x380
i2c_device_probe+0x694/0x880
really_probe+0x1ca/0x5c0
__driver_probe_device+0x248/0x310
driver_probe_device+0x44/0x120
__device_attach_driver+0x174/0x220
bus_for_each_drv+0x100/0x190
__device_attach+0x206/0x370
bus_probe_device+0x123/0x170
device_add+0xd25/0x1470
i2c_new_client_device+0x7a0/0xcd0
do_one_initcall+0x89/0x300
do_init_module+0x29d/0x7f0
load_module+0x4f48/0x69e0
init_module_from_file+0xe4/0x150
idempotent_init_module+0x320/0x670
__x64_sys_finit_module+0xbd/0x120
do_syscall_64+0xac/0x280
entry_SYSCALL_64_after_hwframe+0x77/0x7f
...
Replace timer_delete() with timer_delete_sync() and cancel_delayed_work()
with cancel_delayed_work_sync() to ensure proper termination of timer and
work items before resource cleanup.
This bug was initially identified through static analysis. For reproduction
and testing, I created a functional emulation of the tc358743 device via a
kernel module and introduced faults through the debugfs interface.
Fixes: 869f38ae07f7 ("media: i2c: tc358743: Fix crash in the probe error path when using polling")
Fixes: d32d98642de6 ("[media] Driver for Toshiba TC358743 HDMI to CSI-2 bridge")
Cc: stable(a)vger.kernel.org
Signed-off-by: Duoming Zhou <duoming(a)zju.edu.cn>
Signed-off-by: Hans Verkuil <hverkuil+cisco(a)kernel.org>
diff --git a/drivers/media/i2c/tc358743.c b/drivers/media/i2c/tc358743.c
index aa02a5a6ae3e..a0ca19359c43 100644
--- a/drivers/media/i2c/tc358743.c
+++ b/drivers/media/i2c/tc358743.c
@@ -2326,10 +2326,10 @@ static int tc358743_probe(struct i2c_client *client)
err_work_queues:
cec_unregister_adapter(state->cec_adap);
if (!state->i2c_client->irq) {
- timer_delete(&state->timer);
+ timer_delete_sync(&state->timer);
flush_work(&state->work_i2c_poll);
}
- cancel_delayed_work(&state->delayed_work_enable_hotplug);
+ cancel_delayed_work_sync(&state->delayed_work_enable_hotplug);
mutex_destroy(&state->confctl_mutex);
err_hdl:
media_entity_cleanup(&sd->entity);
From: Kiryl Shutsemau <kas(a)kernel.org>
vm_mmap_pgoff() includes a fsnotify call that allows for pre-content
hooks on mmap().
The fsnotify_mmap_perm() function takes, among other arguments, an
offset in the file in the form of loff_t. However, vm_mmap_pgoff() has
file offset in the form of pgoff. This offset needs to be converted
before being passed to fsnotify_mmap_perm().
The conversion from pgoff to loff_t is incorrect. The pgoff value needs
to be shifted left by PAGE_SHIFT to obtain loff_t, not right.
This issue was identified through code inspection.
Signed-off-by: Kiryl Shutsemau <kas(a)kernel.org>
Fixes: 066e053fe208 ("fsnotify: add pre-content hooks on mmap()")
Cc: stable(a)vger.kernel.org
Cc: Josef Bacik <josef(a)toxicpanda.com>
Cc: Amir Goldstein <amir73il(a)gmail.com>
Cc: Jan Kara <jack(a)suse.cz>
---
mm/util.c | 2 +-
1 file changed, 1 insertion(+), 1 deletion(-)
diff --git a/mm/util.c b/mm/util.c
index f814e6a59ab1..52a667157264 100644
--- a/mm/util.c
+++ b/mm/util.c
@@ -573,7 +573,7 @@ unsigned long vm_mmap_pgoff(struct file *file, unsigned long addr,
ret = security_mmap_file(file, prot, flag);
if (!ret)
- ret = fsnotify_mmap_perm(file, prot, pgoff >> PAGE_SHIFT, len);
+ ret = fsnotify_mmap_perm(file, prot, pgoff << PAGE_SHIFT, len);
if (!ret) {
if (mmap_write_lock_killable(mm))
return -EINTR;
--
2.50.1
Hello,
New build issue found on stable-rc/linux-5.4.y:
---
./arch/arm64/include/asm/memory.h:85:50: error: ‘KASAN_SHADOW_SCALE_SHIFT’ undeclared (first use in this function) in arch/arm64/kernel/vdso32/vgettimeofday.o (arch/arm64/kernel/vdso32/Makefile:166) [logspec:kbuild,kbuild.compiler.error]
---
- dashboard: https://d.kernelci.org/i/maestro:35fc997ccf1864d670c66eb7815463e470fe1fa9
- giturl: https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux-stable-rc.git
- commit HEAD: 2c0548712531f8b879edccf67949a8e5abe4e5e4
Log excerpt:
=====================================================
CC32 arch/arm64/kernel/vdso32/vgettimeofday.o
AS32 arch/arm64/kernel/vdso32/sigreturn.o
HOSTCC arch/arm64/kernel/vdso32/../../../arm/vdso/vdsomunge
In file included from ./arch/arm64/include/asm/thread_info.h:17,
from ./include/linux/thread_info.h:39,
from ./arch/arm64/include/asm/preempt.h:5,
from ./include/linux/preempt.h:78,
from ./include/linux/spinlock.h:51,
from ./include/linux/seqlock.h:36,
from ./include/linux/time.h:6,
from /tmp/kci/linux/lib/vdso/gettimeofday.c:7,
from <command-line>:
./arch/arm64/include/asm/memory.h: In function ‘kaslr_offset’:
./arch/arm64/include/asm/memory.h:85:50: error: ‘KASAN_SHADOW_SCALE_SHIFT’ undeclared (first use in this function)
85 | #define KASAN_SHADOW_END ((UL(1) << (64 - KASAN_SHADOW_SCALE_SHIFT)) \
| ^~~~~~~~~~~~~~~~~~~~~~~~
./arch/arm64/include/asm/memory.h:50:34: note: in expansion of macro ‘KASAN_SHADOW_END’
50 | #define BPF_JIT_REGION_START (KASAN_SHADOW_END)
| ^~~~~~~~~~~~~~~~
./arch/arm64/include/asm/memory.h:52:34: note: in expansion of macro ‘BPF_JIT_REGION_START’
52 | #define BPF_JIT_REGION_END (BPF_JIT_REGION_START + BPF_JIT_REGION_SIZE)
| ^~~~~~~~~~~~~~~~~~~~
./arch/arm64/include/asm/memory.h:54:34: note: in expansion of macro ‘BPF_JIT_REGION_END’
54 | #define MODULES_VADDR (BPF_JIT_REGION_END)
| ^~~~~~~~~~~~~~~~~~
./arch/arm64/include/asm/memory.h:53:34: note: in expansion of macro ‘MODULES_VADDR’
53 | #define MODULES_END (MODULES_VADDR + MODULES_VSIZE)
| ^~~~~~~~~~~~~
./arch/arm64/include/asm/memory.h:49:34: note: in expansion of macro ‘MODULES_END’
49 | #define KIMAGE_VADDR (MODULES_END)
| ^~~~~~~~~~~
./arch/arm64/include/asm/memory.h:193:31: note: in expansion of macro ‘KIMAGE_VADDR’
193 | return kimage_vaddr - KIMAGE_VADDR;
| ^~~~~~~~~~~~
./arch/arm64/include/asm/memory.h:85:50: note: each undeclared identifier is reported only once for each function it appears in
85 | #define KASAN_SHADOW_END ((UL(1) << (64 - KASAN_SHADOW_SCALE_SHIFT)) \
| ^~~~~~~~~~~~~~~~~~~~~~~~
./arch/arm64/include/asm/memory.h:50:34: note: in expansion of macro ‘KASAN_SHADOW_END’
50 | #define BPF_JIT_REGION_START (KASAN_SHADOW_END)
| ^~~~~~~~~~~~~~~~
./arch/arm64/include/asm/memory.h:52:34: note: in expansion of macro ‘BPF_JIT_REGION_START’
52 | #define BPF_JIT_REGION_END (BPF_JIT_REGION_START + BPF_JIT_REGION_SIZE)
| ^~~~~~~~~~~~~~~~~~~~
./arch/arm64/include/asm/memory.h:54:34: note: in expansion of macro ‘BPF_JIT_REGION_END’
54 | #define MODULES_VADDR (BPF_JIT_REGION_END)
| ^~~~~~~~~~~~~~~~~~
./arch/arm64/include/asm/memory.h:53:34: note: in expansion of macro ‘MODULES_VADDR’
53 | #define MODULES_END (MODULES_VADDR + MODULES_VSIZE)
| ^~~~~~~~~~~~~
./arch/arm64/include/asm/memory.h:49:34: note: in expansion of macro ‘MODULES_END’
49 | #define KIMAGE_VADDR (MODULES_END)
| ^~~~~~~~~~~
./arch/arm64/include/asm/memory.h:193:31: note: in expansion of macro ‘KIMAGE_VADDR’
193 | return kimage_vaddr - KIMAGE_VADDR;
| ^~~~~~~~~~~~
./arch/arm64/include/asm/memory.h: In function ‘__tag_set’:
./arch/arm64/include/asm/memory.h:238:22: warning: cast from pointer to integer of different size [-Wpointer-to-int-cast]
238 | u64 __addr = (u64)addr & ~__tag_shifted(0xff);
| ^
In file included from ./arch/arm64/include/asm/pgtable-hwdef.h:8,
from ./arch/arm64/include/asm/processor.h:34,
from ./arch/arm64/include/asm/elf.h:118,
from ./include/linux/elf.h:5,
from ./include/linux/elfnote.h:62,
from arch/arm64/kernel/vdso32/note.c:11:
./arch/arm64/include/asm/memory.h: In function ‘kaslr_offset’:
./arch/arm64/include/asm/memory.h:85:50: error: ‘KASAN_SHADOW_SCALE_SHIFT’ undeclared (first use in this function)
85 | #define KASAN_SHADOW_END ((UL(1) << (64 - KASAN_SHADOW_SCALE_SHIFT)) \
| ^~~~~~~~~~~~~~~~~~~~~~~~
./arch/arm64/include/asm/memory.h:50:34: note: in expansion of macro ‘KASAN_SHADOW_END’
50 | #define BPF_JIT_REGION_START (KASAN_SHADOW_END)
| ^~~~~~~~~~~~~~~~
./arch/arm64/include/asm/memory.h:52:34: note: in expansion of macro ‘BPF_JIT_REGION_START’
52 | #define BPF_JIT_REGION_END (BPF_JIT_REGION_START + BPF_JIT_REGION_SIZE)
| ^~~~~~~~~~~~~~~~~~~~
./arch/arm64/include/asm/memory.h:54:34: note: in expansion of macro ‘BPF_JIT_REGION_END’
54 | #define MODULES_VADDR (BPF_JIT_REGION_END)
| ^~~~~~~~~~~~~~~~~~
./arch/arm64/include/asm/memory.h:53:34: note: in expansion of macro ‘MODULES_VADDR’
53 | #define MODULES_END (MODULES_VADDR + MODULES_VSIZE)
| ^~~~~~~~~~~~~
./arch/arm64/include/asm/memory.h:49:34: note: in expansion of macro ‘MODULES_END’
49 | #define KIMAGE_VADDR (MODULES_END)
| ^~~~~~~~~~~
./arch/arm64/include/asm/memory.h:193:31: note: in expansion of macro ‘KIMAGE_VADDR’
193 | return kimage_vaddr - KIMAGE_VADDR;
| ^~~~~~~~~~~~
./arch/arm64/include/asm/memory.h:85:50: note: each undeclared identifier is reported only once for each function it appears in
85 | #define KASAN_SHADOW_END ((UL(1) << (64 - KASAN_SHADOW_SCALE_SHIFT)) \
| ^~~~~~~~~~~~~~~~~~~~~~~~
./arch/arm64/include/asm/memory.h:50:34: note: in expansion of macro ‘KASAN_SHADOW_END’
50 | #define BPF_JIT_REGION_START (KASAN_SHADOW_END)
| ^~~~~~~~~~~~~~~~
./arch/arm64/include/asm/memory.h:52:34: note: in expansion of macro ‘BPF_JIT_REGION_START’
52 | #define BPF_JIT_REGION_END (BPF_JIT_REGION_START + BPF_JIT_REGION_SIZE)
| ^~~~~~~~~~~~~~~~~~~~
./arch/arm64/include/asm/memory.h:54:34: note: in expansion of macro ‘BPF_JIT_REGION_END’
54 | #define MODULES_VADDR (BPF_JIT_REGION_END)
| ^~~~~~~~~~~~~~~~~~
./arch/arm64/include/asm/memory.h:53:34: note: in expansion of macro ‘MODULES_VADDR’
53 | #define MODULES_END (MODULES_VADDR + MODULES_VSIZE)
| ^~~~~~~~~~~~~
./arch/arm64/include/asm/memory.h:49:34: note: in expansion of macro ‘MODULES_END’
49 | #define KIMAGE_VADDR (MODULES_END)
| ^~~~~~~~~~~
./arch/arm64/include/asm/memory.h:193:31: note: in expansion of macro ‘KIMAGE_VADDR’
193 | return kimage_vaddr - KIMAGE_VADDR;
| ^~~~~~~~~~~~
./arch/arm64/include/asm/memory.h: In function ‘__tag_set’:
./arch/arm64/include/asm/memory.h:238:22: warning: cast from pointer to integer of different size [-Wpointer-to-int-cast]
238 | u64 __addr = (u64)addr & ~__tag_shifted(0xff);
| ^
=====================================================
# Builds where the incident occurred:
## defconfig+arm64-chromebook+kcidebug+lab-setup on (arm64):
- compiler: gcc-12
- dashboard: https://d.kernelci.org/build/maestro:68dffa7e841b167e8d3e0d0c
#kernelci issue maestro:35fc997ccf1864d670c66eb7815463e470fe1fa9
Reported-by: kernelci.org bot <bot(a)kernelci.org>
--
This is an experimental report format. Please send feedback in!
Talk to us at kernelci(a)lists.linux.dev
Made with love by the KernelCI team - https://kernelci.org
The patch below does not apply to the 6.12-stable tree.
If someone wants it applied there, or to any other stable or longterm
tree, then please email the backport, including the original git commit
id to <stable(a)vger.kernel.org>.
To reproduce the conflict and resubmit, you may use the following commands:
git fetch https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git/ linux-6.12.y
git checkout FETCH_HEAD
git cherry-pick -x 79d10f4f21a92e459b2276a77be62c59c1502c9d
# <resolve conflicts, build, test, etc.>
git commit -s
git send-email --to '<stable(a)vger.kernel.org>' --in-reply-to '2025100327-municipal-zone-0d8a@gregkh' --subject-prefix 'PATCH 6.12.y' HEAD^..
Possible dependencies:
thanks,
greg k-h
------------------ original commit in Linus's tree ------------------
From 79d10f4f21a92e459b2276a77be62c59c1502c9d Mon Sep 17 00:00:00 2001
From: Duoming Zhou <duoming(a)zju.edu.cn>
Date: Wed, 17 Sep 2025 17:57:42 +0800
Subject: [PATCH] media: i2c: tc358743: Fix use-after-free bugs caused by
orphan timer in probe
The state->timer is a cyclic timer that schedules work_i2c_poll and
delayed_work_enable_hotplug, while rearming itself. Using timer_delete()
fails to guarantee the timer isn't still running when destroyed, similarly
cancel_delayed_work() cannot ensure delayed_work_enable_hotplug has
terminated if already executing. During probe failure after timer
initialization, these may continue running as orphans and reference the
already-freed tc358743_state object through tc358743_irq_poll_timer.
The following is the trace captured by KASAN.
BUG: KASAN: slab-use-after-free in __run_timer_base.part.0+0x7d7/0x8c0
Write of size 8 at addr ffff88800ded83c8 by task swapper/1/0
...
Call Trace:
<IRQ>
dump_stack_lvl+0x55/0x70
print_report+0xcf/0x610
? __pfx_sched_balance_find_src_group+0x10/0x10
? __run_timer_base.part.0+0x7d7/0x8c0
kasan_report+0xb8/0xf0
? __run_timer_base.part.0+0x7d7/0x8c0
__run_timer_base.part.0+0x7d7/0x8c0
? rcu_sched_clock_irq+0xb06/0x27d0
? __pfx___run_timer_base.part.0+0x10/0x10
? try_to_wake_up+0xb15/0x1960
? tmigr_update_events+0x280/0x740
? _raw_spin_lock_irq+0x80/0xe0
? __pfx__raw_spin_lock_irq+0x10/0x10
tmigr_handle_remote_up+0x603/0x7e0
? __pfx_tmigr_handle_remote_up+0x10/0x10
? sched_balance_trigger+0x98/0x9f0
? sched_tick+0x221/0x5a0
? _raw_spin_lock_irq+0x80/0xe0
? __pfx__raw_spin_lock_irq+0x10/0x10
? tick_nohz_handler+0x339/0x440
? __pfx_tmigr_handle_remote_up+0x10/0x10
__walk_groups.isra.0+0x42/0x150
tmigr_handle_remote+0x1f4/0x2e0
? __pfx_tmigr_handle_remote+0x10/0x10
? ktime_get+0x60/0x140
? lapic_next_event+0x11/0x20
? clockevents_program_event+0x1d4/0x2a0
? hrtimer_interrupt+0x322/0x780
handle_softirqs+0x16a/0x550
irq_exit_rcu+0xaf/0xe0
sysvec_apic_timer_interrupt+0x70/0x80
</IRQ>
...
Allocated by task 141:
kasan_save_stack+0x24/0x50
kasan_save_track+0x14/0x30
__kasan_kmalloc+0x7f/0x90
__kmalloc_node_track_caller_noprof+0x198/0x430
devm_kmalloc+0x7b/0x1e0
tc358743_probe+0xb7/0x610 i2c_device_probe+0x51d/0x880
really_probe+0x1ca/0x5c0
__driver_probe_device+0x248/0x310
driver_probe_device+0x44/0x120
__device_attach_driver+0x174/0x220
bus_for_each_drv+0x100/0x190
__device_attach+0x206/0x370
bus_probe_device+0x123/0x170
device_add+0xd25/0x1470
i2c_new_client_device+0x7a0/0xcd0
do_one_initcall+0x89/0x300
do_init_module+0x29d/0x7f0
load_module+0x4f48/0x69e0
init_module_from_file+0xe4/0x150
idempotent_init_module+0x320/0x670
__x64_sys_finit_module+0xbd/0x120
do_syscall_64+0xac/0x280
entry_SYSCALL_64_after_hwframe+0x77/0x7f
Freed by task 141:
kasan_save_stack+0x24/0x50
kasan_save_track+0x14/0x30
kasan_save_free_info+0x3a/0x60
__kasan_slab_free+0x3f/0x50
kfree+0x137/0x370
release_nodes+0xa4/0x100
devres_release_group+0x1b2/0x380
i2c_device_probe+0x694/0x880
really_probe+0x1ca/0x5c0
__driver_probe_device+0x248/0x310
driver_probe_device+0x44/0x120
__device_attach_driver+0x174/0x220
bus_for_each_drv+0x100/0x190
__device_attach+0x206/0x370
bus_probe_device+0x123/0x170
device_add+0xd25/0x1470
i2c_new_client_device+0x7a0/0xcd0
do_one_initcall+0x89/0x300
do_init_module+0x29d/0x7f0
load_module+0x4f48/0x69e0
init_module_from_file+0xe4/0x150
idempotent_init_module+0x320/0x670
__x64_sys_finit_module+0xbd/0x120
do_syscall_64+0xac/0x280
entry_SYSCALL_64_after_hwframe+0x77/0x7f
...
Replace timer_delete() with timer_delete_sync() and cancel_delayed_work()
with cancel_delayed_work_sync() to ensure proper termination of timer and
work items before resource cleanup.
This bug was initially identified through static analysis. For reproduction
and testing, I created a functional emulation of the tc358743 device via a
kernel module and introduced faults through the debugfs interface.
Fixes: 869f38ae07f7 ("media: i2c: tc358743: Fix crash in the probe error path when using polling")
Fixes: d32d98642de6 ("[media] Driver for Toshiba TC358743 HDMI to CSI-2 bridge")
Cc: stable(a)vger.kernel.org
Signed-off-by: Duoming Zhou <duoming(a)zju.edu.cn>
Signed-off-by: Hans Verkuil <hverkuil+cisco(a)kernel.org>
diff --git a/drivers/media/i2c/tc358743.c b/drivers/media/i2c/tc358743.c
index aa02a5a6ae3e..a0ca19359c43 100644
--- a/drivers/media/i2c/tc358743.c
+++ b/drivers/media/i2c/tc358743.c
@@ -2326,10 +2326,10 @@ static int tc358743_probe(struct i2c_client *client)
err_work_queues:
cec_unregister_adapter(state->cec_adap);
if (!state->i2c_client->irq) {
- timer_delete(&state->timer);
+ timer_delete_sync(&state->timer);
flush_work(&state->work_i2c_poll);
}
- cancel_delayed_work(&state->delayed_work_enable_hotplug);
+ cancel_delayed_work_sync(&state->delayed_work_enable_hotplug);
mutex_destroy(&state->confctl_mutex);
err_hdl:
media_entity_cleanup(&sd->entity);
Hi,
Changes since v1:
- SHAs for Fixes tag corrected (sorry)
The size of the DSP host buffer was incorrectly defined as 2ms while
it is 4ms and the ChainDMA PCMs are using 5ms as host facing buffer.
The constraint will be set against the period time rather than the buffer
time to make sure that application will not face with xruns when the
DMA bursts to refill the host buffer.
The minimal period size will be also used by Pipewire in case of SOF
cards to set the headroom to a length which will avoid the cases when
the hw_ptr jumps over the appl_ptr because of a burst.
Iow, it will make Pipewire to keep a safe distance from the hw_ptr.
https://github.com/thesofproject/linux/issues/5284https://gitlab.freedesktop.org/pipewire/wireplumber/-/merge_requests/740https://gitlab.freedesktop.org/pipewire/pipewire/-/merge_requests/2548
Regards,
Peter
---
Peter Ujfalusi (3):
ASoC: SOF: ipc4-topology: Correct the minimum host DMA buffer size
ASoC: SOF: ipc4-topology: Account for different ChainDMA host buffer
size
ASoC: SOF: Intel: hda-pcm: Place the constraint on period time instead
of buffer time
sound/soc/sof/intel/hda-pcm.c | 29 +++++++++++++++++++++--------
sound/soc/sof/ipc4-topology.c | 9 +++++++--
sound/soc/sof/ipc4-topology.h | 7 +++++--
3 files changed, 33 insertions(+), 12 deletions(-)
--
2.51.0
Hi,
With SRC in the firmware processing pipeline the FE and BE rate
can be different, the sample counters on the two side of the DSP
counts in different rate domain and they will drift apart.
The counters should be moved to the same rate domain to be
usable for delay calculation.
The ChainDMA offset value was incorrect since the host buffer size
and the trigger to start the chain is misunderstood initially.
Finally: we can have a situation when the host and link DMA channel
in HDA is not using matching channel ids.
We need to look up the link channel explicitly to make sure that we
read the LLP from the correct link.
Regards,
Peter
---
Kai Vehmanen (3):
ASoC: SOF: ipc4-pcm: fix delay calculation when DSP resamples
ASoC: SOF: ipc4-pcm: fix start offset calculation for chain DMA
ASoC: SOF: ipc4-pcm: do not report invalid delay values
Peter Ujfalusi (2):
ASoC: SOF: sof-audio: add dev_dbg_ratelimited wrapper
ASoC: SOF: Intel: Read the LLP via the associated Link DMA channel
sound/soc/sof/intel/hda-stream.c | 29 ++++++++-
sound/soc/sof/ipc4-pcm.c | 104 ++++++++++++++++++++++++-------
sound/soc/sof/ipc4-topology.c | 1 -
sound/soc/sof/ipc4-topology.h | 2 +
sound/soc/sof/sof-audio.h | 5 ++
5 files changed, 114 insertions(+), 27 deletions(-)
--
2.51.0
The patch below does not apply to the 6.12-stable tree.
If someone wants it applied there, or to any other stable or longterm
tree, then please email the backport, including the original git commit
id to <stable(a)vger.kernel.org>.
To reproduce the conflict and resubmit, you may use the following commands:
git fetch https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git/ linux-6.12.y
git checkout FETCH_HEAD
git cherry-pick -x 358ee50ab565f3c8ea32480e9d03127a81ba32f8
# <resolve conflicts, build, test, etc.>
git commit -s
git send-email --to '<stable(a)vger.kernel.org>' --in-reply-to '2025100328-armchair-going-304b@gregkh' --subject-prefix 'PATCH 6.12.y' HEAD^..
Possible dependencies:
thanks,
greg k-h
------------------ original commit in Linus's tree ------------------
From 358ee50ab565f3c8ea32480e9d03127a81ba32f8 Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Thomas=20Hellstr=C3=B6m?= <thomas.hellstrom(a)linux.intel.com>
Date: Thu, 21 Aug 2025 16:30:45 +0200
Subject: [PATCH] drm/xe/vm: Clear the scratch_pt pointer on error
MIME-Version: 1.0
Content-Type: text/plain; charset=UTF-8
Content-Transfer-Encoding: 8bit
Avoid triggering a dereference of an error pointer on cleanup in
xe_vm_free_scratch() by clearing any scratch_pt error pointer.
Signed-off-by: Thomas Hellström <thomas.hellstrom(a)linux.intel.com>
Fixes: 06951c2ee72d ("drm/xe: Use NULL PTEs as scratch PTEs")
Cc: Brian Welty <brian.welty(a)intel.com>
Cc: Rodrigo Vivi <rodrigo.vivi(a)intel.com>
Cc: Lucas De Marchi <lucas.demarchi(a)intel.com>
Cc: <stable(a)vger.kernel.org> # v6.8+
Reviewed-by: Matthew Brost <matthew.brost(a)intel.com>
Link: https://lore.kernel.org/r/20250821143045.106005-4-thomas.hellstrom@linux.in…
diff --git a/drivers/gpu/drm/xe/xe_vm.c b/drivers/gpu/drm/xe/xe_vm.c
index c86337e08a55..d3f6dc6b1779 100644
--- a/drivers/gpu/drm/xe/xe_vm.c
+++ b/drivers/gpu/drm/xe/xe_vm.c
@@ -1635,8 +1635,12 @@ static int xe_vm_create_scratch(struct xe_device *xe, struct xe_tile *tile,
for (i = MAX_HUGEPTE_LEVEL; i < vm->pt_root[id]->level; i++) {
vm->scratch_pt[id][i] = xe_pt_create(vm, tile, i);
- if (IS_ERR(vm->scratch_pt[id][i]))
- return PTR_ERR(vm->scratch_pt[id][i]);
+ if (IS_ERR(vm->scratch_pt[id][i])) {
+ int err = PTR_ERR(vm->scratch_pt[id][i]);
+
+ vm->scratch_pt[id][i] = NULL;
+ return err;
+ }
xe_pt_populate_empty(tile, vm, vm->scratch_pt[id][i]);
}
The patch below does not apply to the 6.16-stable tree.
If someone wants it applied there, or to any other stable or longterm
tree, then please email the backport, including the original git commit
id to <stable(a)vger.kernel.org>.
To reproduce the conflict and resubmit, you may use the following commands:
git fetch https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git/ linux-6.16.y
git checkout FETCH_HEAD
git cherry-pick -x 358ee50ab565f3c8ea32480e9d03127a81ba32f8
# <resolve conflicts, build, test, etc.>
git commit -s
git send-email --to '<stable(a)vger.kernel.org>' --in-reply-to '2025100327-kindly-attic-f695@gregkh' --subject-prefix 'PATCH 6.16.y' HEAD^..
Possible dependencies:
thanks,
greg k-h
------------------ original commit in Linus's tree ------------------
From 358ee50ab565f3c8ea32480e9d03127a81ba32f8 Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Thomas=20Hellstr=C3=B6m?= <thomas.hellstrom(a)linux.intel.com>
Date: Thu, 21 Aug 2025 16:30:45 +0200
Subject: [PATCH] drm/xe/vm: Clear the scratch_pt pointer on error
MIME-Version: 1.0
Content-Type: text/plain; charset=UTF-8
Content-Transfer-Encoding: 8bit
Avoid triggering a dereference of an error pointer on cleanup in
xe_vm_free_scratch() by clearing any scratch_pt error pointer.
Signed-off-by: Thomas Hellström <thomas.hellstrom(a)linux.intel.com>
Fixes: 06951c2ee72d ("drm/xe: Use NULL PTEs as scratch PTEs")
Cc: Brian Welty <brian.welty(a)intel.com>
Cc: Rodrigo Vivi <rodrigo.vivi(a)intel.com>
Cc: Lucas De Marchi <lucas.demarchi(a)intel.com>
Cc: <stable(a)vger.kernel.org> # v6.8+
Reviewed-by: Matthew Brost <matthew.brost(a)intel.com>
Link: https://lore.kernel.org/r/20250821143045.106005-4-thomas.hellstrom@linux.in…
diff --git a/drivers/gpu/drm/xe/xe_vm.c b/drivers/gpu/drm/xe/xe_vm.c
index c86337e08a55..d3f6dc6b1779 100644
--- a/drivers/gpu/drm/xe/xe_vm.c
+++ b/drivers/gpu/drm/xe/xe_vm.c
@@ -1635,8 +1635,12 @@ static int xe_vm_create_scratch(struct xe_device *xe, struct xe_tile *tile,
for (i = MAX_HUGEPTE_LEVEL; i < vm->pt_root[id]->level; i++) {
vm->scratch_pt[id][i] = xe_pt_create(vm, tile, i);
- if (IS_ERR(vm->scratch_pt[id][i]))
- return PTR_ERR(vm->scratch_pt[id][i]);
+ if (IS_ERR(vm->scratch_pt[id][i])) {
+ int err = PTR_ERR(vm->scratch_pt[id][i]);
+
+ vm->scratch_pt[id][i] = NULL;
+ return err;
+ }
xe_pt_populate_empty(tile, vm, vm->scratch_pt[id][i]);
}
The patch below does not apply to the 6.17-stable tree.
If someone wants it applied there, or to any other stable or longterm
tree, then please email the backport, including the original git commit
id to <stable(a)vger.kernel.org>.
To reproduce the conflict and resubmit, you may use the following commands:
git fetch https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git/ linux-6.17.y
git checkout FETCH_HEAD
git cherry-pick -x 358ee50ab565f3c8ea32480e9d03127a81ba32f8
# <resolve conflicts, build, test, etc.>
git commit -s
git send-email --to '<stable(a)vger.kernel.org>' --in-reply-to '2025100327-judgingly-revenue-6ef4@gregkh' --subject-prefix 'PATCH 6.17.y' HEAD^..
Possible dependencies:
thanks,
greg k-h
------------------ original commit in Linus's tree ------------------
From 358ee50ab565f3c8ea32480e9d03127a81ba32f8 Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Thomas=20Hellstr=C3=B6m?= <thomas.hellstrom(a)linux.intel.com>
Date: Thu, 21 Aug 2025 16:30:45 +0200
Subject: [PATCH] drm/xe/vm: Clear the scratch_pt pointer on error
MIME-Version: 1.0
Content-Type: text/plain; charset=UTF-8
Content-Transfer-Encoding: 8bit
Avoid triggering a dereference of an error pointer on cleanup in
xe_vm_free_scratch() by clearing any scratch_pt error pointer.
Signed-off-by: Thomas Hellström <thomas.hellstrom(a)linux.intel.com>
Fixes: 06951c2ee72d ("drm/xe: Use NULL PTEs as scratch PTEs")
Cc: Brian Welty <brian.welty(a)intel.com>
Cc: Rodrigo Vivi <rodrigo.vivi(a)intel.com>
Cc: Lucas De Marchi <lucas.demarchi(a)intel.com>
Cc: <stable(a)vger.kernel.org> # v6.8+
Reviewed-by: Matthew Brost <matthew.brost(a)intel.com>
Link: https://lore.kernel.org/r/20250821143045.106005-4-thomas.hellstrom@linux.in…
diff --git a/drivers/gpu/drm/xe/xe_vm.c b/drivers/gpu/drm/xe/xe_vm.c
index c86337e08a55..d3f6dc6b1779 100644
--- a/drivers/gpu/drm/xe/xe_vm.c
+++ b/drivers/gpu/drm/xe/xe_vm.c
@@ -1635,8 +1635,12 @@ static int xe_vm_create_scratch(struct xe_device *xe, struct xe_tile *tile,
for (i = MAX_HUGEPTE_LEVEL; i < vm->pt_root[id]->level; i++) {
vm->scratch_pt[id][i] = xe_pt_create(vm, tile, i);
- if (IS_ERR(vm->scratch_pt[id][i]))
- return PTR_ERR(vm->scratch_pt[id][i]);
+ if (IS_ERR(vm->scratch_pt[id][i])) {
+ int err = PTR_ERR(vm->scratch_pt[id][i]);
+
+ vm->scratch_pt[id][i] = NULL;
+ return err;
+ }
xe_pt_populate_empty(tile, vm, vm->scratch_pt[id][i]);
}
On Sun, Sep 21, 2025 at 3:05 PM <gregkh(a)linuxfoundation.org> wrote:
>
> This is a note to let you know that I've just added the patch titled
>
> LoongArch: Handle jump tables options for RUST
>
> to the 6.16-stable tree which can be found at:
> http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=sum…
...
> commit 74f8295c6fb8436bec9995baf6ba463151b6fb68 upstream.
Huacai et al.: I wonder if we could get this one into 6.12.y?
Maybe no one actually cares in practice, so please feel free to ignore
it, but it is the only `objtool` warning (a lot of instances, but just
that kind from a quick look) I have in my LoongArch Rust builds I have
in 6.12.y, and it would be nice to have it clean.
Thanks!
Cheers,
Miguel
This series backports 11 patches to update minmax.h in the 6.1.y branch,
aligning it with v6.17-rc7.
The ultimate goal is to synchronize all longterm branches so that they
include the full set of minmax.h changes (6.12.y and 6.6.y were already
backported by me and are now aligned).
The key motivation is to bring in commit d03eba99f5bf ("minmax: allow
min()/max()/clamp() if the arguments have the same signedness"), which
is missing in older kernels.
In mainline, this change enables min()/max()/clamp() to accept mixed
argument types, provided both have the same signedness. Without it,
backported patches that use these forms may trigger compiler warnings,
which escalate to build failures when -Werror is enabled.
Changes in v4:
- Just swap the order of the first 2 patches in this chain, because
commit cb04e8b1d2f2 ("minmax: don't use max() in situations that want
a C constant expression") should come before commit dc1c8034e31b
("minmax: simplify min()/max()/clamp() implementation").
Changes in v3:
- v2 included 13 patches:
https://lore.kernel.org/stable/20250929183358.18982-1-farbere@amazon.com/
- First 2 were accepted and are part of 6.1.155.
- 3rd caused build in drivers/md/ to fail:
In file included from ./include/linux/container_of.h:5,
from ./include/linux/list.h:5,
from ./include/linux/wait.h:7,
from ./include/linux/mempool.h:8,
from ./include/linux/bio.h:8,
from drivers/md/dm-bio-record.h:10,
from drivers/md/dm-integrity.c:9:
drivers/md/dm-integrity.c: In function ‘integrity_metadata’:
drivers/md/dm-integrity.c:131:105: error: ISO C90 forbids variable length array ‘checksums_onstack’ [-Werror=vla]
131 | #define MAX_TAG_SIZE (JOURNAL_SECTOR_DATA - JOURNAL_MAC_PER_SECTOR - offsetof(struct journal_entry, last_bytes[MAX_SECTORS_PER_BLOCK]))
| ^~~~~~~~~~~~~
./include/linux/build_bug.h:78:56: note: in definition of macro ‘__static_assert’
78 | #define __static_assert(expr, msg, ...) _Static_assert(expr, msg)
| ^~~~
./include/linux/minmax.h:56:9: note: in expansion of macro ‘static_assert’
56 | static_assert(__types_ok(x, y, ux, uy), \
| ^~~~~~~~~~~~~
./include/linux/minmax.h:41:31: note: in expansion of macro ‘__is_noneg_int’
41 | __is_noneg_int(x) || __is_noneg_int(y))
| ^~~~~~~~~~~~~~
./include/linux/minmax.h:56:23: note: in expansion of macro ‘__types_ok’
56 | static_assert(__types_ok(x, y, ux, uy), \
| ^~~~~~~~~~
./include/linux/minmax.h:61:9: note: in expansion of macro ‘__careful_cmp_once’
61 | __careful_cmp_once(op, x, y, __UNIQUE_ID(x_), __UNIQUE_ID(y_))
| ^~~~~~~~~~~~~~~~~~
./include/linux/minmax.h:92:25: note: in expansion of macro ‘__careful_cmp’
92 | #define max(x, y) __careful_cmp(max, x, y)
| ^~~~~~~~~~~~~
drivers/md/dm-integrity.c:1797:40: note: in expansion of macro ‘max’
1797 | char checksums_onstack[max((size_t)HASH_MAX_DIGESTSIZE, MAX_TAG_SIZE)];
| ^~~
drivers/md/dm-integrity.c:131:89: note: in expansion of macro ‘offsetof’
131 | #define MAX_TAG_SIZE (JOURNAL_SECTOR_DATA - JOURNAL_MAC_PER_SECTOR - offsetof(struct journal_entry, last_bytes[MAX_SECTORS_PER_BLOCK]))
| ^~~~~~~~
drivers/md/dm-integrity.c:1797:73: note: in expansion of macro ‘MAX_TAG_SIZE’
1797 | char checksums_onstack[max((size_t)HASH_MAX_DIGESTSIZE, MAX_TAG_SIZE)];
| ^~~~~~~~~~~~
- The build was fixed in the second patch of this series.
Changes in v2:
- v1 included 19 patches:
https://lore.kernel.org/stable/20250924202320.32333-1-farbere@amazon.com/
- First 6 were pushed to the stable-tree.
- 7th cauded amd driver's build to fail.
- This change fixes it.
- Modified files:
drivers/gpu/drm/amd/amdgpu/amdgpu.h
drivers/gpu/drm/amd/pm/swsmu/smu11/sienna_cichlid_ppt.c
drivers/gpu/drm/amd/pm/swsmu/smu13/smu_v13_0_0_ppt.c
David Laight (7):
minmax.h: add whitespace around operators and after commas
minmax.h: update some comments
minmax.h: reduce the #define expansion of min(), max() and clamp()
minmax.h: use BUILD_BUG_ON_MSG() for the lo < hi test in clamp()
minmax.h: move all the clamp() definitions after the min/max() ones
minmax.h: simplify the variants of clamp()
minmax.h: remove some #defines that are only expanded once
Linus Torvalds (4):
minmax: don't use max() in situations that want a C constant
expression
minmax: simplify min()/max()/clamp() implementation
minmax: improve macro expansion and type checking
minmax: fix up min3() and max3() too
drivers/gpu/drm/amd/pm/swsmu/smu_cmn.c | 2 +-
drivers/input/touchscreen/cyttsp4_core.c | 2 +-
drivers/irqchip/irq-sun6i-r.c | 2 +-
drivers/md/dm-integrity.c | 2 +-
fs/btrfs/tree-checker.c | 2 +-
include/linux/compiler.h | 9 +
include/linux/minmax.h | 222 +++++++++++++----------
lib/vsprintf.c | 2 +-
8 files changed, 143 insertions(+), 100 deletions(-)
--
2.47.3
Fix a memory leak in netpoll and introduce netconsole selftests that
expose the issue when running with kmemleak detection enabled.
This patchset includes a selftest for netpoll with multiple concurrent
users (netconsole + bonding), which simulates the scenario from test[1]
that originally demonstrated the issue allegedly fixed by commit
efa95b01da18 ("netpoll: fix use after free") - a commit that is now
being reverted.
Sending this to "net" branch because this is a fix, and the selftest
might help with the backports validation.
Link: https://lore.kernel.org/lkml/96b940137a50e5c387687bb4f57de8b0435a653f.14048… [1]
Signed-off-by: Breno Leitao <leitao(a)debian.org>
---
Changes in v7:
- Rebased on top of `net`
- Link to v6: https://lore.kernel.org/r/20251002-netconsole_torture-v6-0-543bf52f6b46@deb…
Changes in v6:
- Expand the tests even more and some small fixups
- Moved the test to bonding selftests
- Link to v5: https://lore.kernel.org/r/20250918-netconsole_torture-v5-0-77e25e0a4eb6@deb…
Changes in v5:
- Set CONFIG_BONDING=m in selftests/drivers/net/config.
- Link to v4: https://lore.kernel.org/r/20250917-netconsole_torture-v4-0-0a5b3b8f81ce@deb…
Changes in v4:
- Added an additional selftest to test multiple netpoll users in
parallel
- Link to v3: https://lore.kernel.org/r/20250905-netconsole_torture-v3-0-875c7febd316@deb…
Changes in v3:
- This patchset is a merge of the fix and the selftest together as
recommended by Jakub.
Changes in v2:
- Reuse the netconsole creation from lib_netcons.sh. Thus, refactoring
the create_dynamic_target() (Jakub)
- Move the "wait" to after all the messages has been sent.
- Link to v1: https://lore.kernel.org/r/20250902-netconsole_torture-v1-1-03c6066598e9@deb…
---
Breno Leitao (4):
net: netpoll: fix incorrect refcount handling causing incorrect cleanup
selftest: netcons: refactor target creation
selftest: netcons: create a torture test
selftest: netcons: add test for netconsole over bonded interfaces
net/core/netpoll.c | 7 +-
tools/testing/selftests/drivers/net/Makefile | 1 +
.../testing/selftests/drivers/net/bonding/Makefile | 2 +
tools/testing/selftests/drivers/net/bonding/config | 4 +
.../drivers/net/bonding/netcons_over_bonding.sh | 221 +++++++++++++++++++++
.../selftests/drivers/net/lib/sh/lib_netcons.sh | 188 ++++++++++++++++--
.../selftests/drivers/net/netcons_torture.sh | 127 ++++++++++++
7 files changed, 530 insertions(+), 20 deletions(-)
---
base-commit: 7ae421cf78bd795513ec3a7d7ef7ac9437693e23
change-id: 20250902-netconsole_torture-8fc23f0aca99
Best regards,
--
Breno Leitao <leitao(a)debian.org>
Hello,
I want a quote and I would like to know your availability so that
i can send you the necessary documents as well as drawings and
specification.
Best regards
Tony
Fix a memory leak in netpoll and introduce netconsole selftests that
expose the issue when running with kmemleak detection enabled.
This patchset includes a selftest for netpoll with multiple concurrent
users (netconsole + bonding), which simulates the scenario from test[1]
that originally demonstrated the issue allegedly fixed by commit
efa95b01da18 ("netpoll: fix use after free") - a commit that is now
being reverted.
Sending this to "net" branch because this is a fix, and the selftest
might help with the backports validation.
Link: https://lore.kernel.org/lkml/96b940137a50e5c387687bb4f57de8b0435a653f.14048… [1]
Signed-off-by: Breno Leitao <leitao(a)debian.org>
---
Changes in v6:
- Expand the tests even more and some small fixups
- Moved the test to bonding selftests
- Link to v5: https://lore.kernel.org/r/20250918-netconsole_torture-v5-0-77e25e0a4eb6@deb…
Changes in v5:
- Set CONFIG_BONDING=m in selftests/drivers/net/config.
- Link to v4: https://lore.kernel.org/r/20250917-netconsole_torture-v4-0-0a5b3b8f81ce@deb…
Changes in v4:
- Added an additional selftest to test multiple netpoll users in
parallel
- Link to v3: https://lore.kernel.org/r/20250905-netconsole_torture-v3-0-875c7febd316@deb…
Changes in v3:
- This patchset is a merge of the fix and the selftest together as
recommended by Jakub.
Changes in v2:
- Reuse the netconsole creation from lib_netcons.sh. Thus, refactoring
the create_dynamic_target() (Jakub)
- Move the "wait" to after all the messages has been sent.
- Link to v1: https://lore.kernel.org/r/20250902-netconsole_torture-v1-1-03c6066598e9@deb…
---
Breno Leitao (4):
net: netpoll: fix incorrect refcount handling causing incorrect cleanup
selftest: netcons: refactor target creation
selftest: netcons: create a torture test
selftest: netcons: add test for netconsole over bonded interfaces
net/core/netpoll.c | 7 +++++--
tools/testing/selftests/drivers/net/Makefile | 1 +
tools/testing/selftests/drivers/net/bonding/Makefile | 2 ++
tools/testing/selftests/drivers/net/bonding/config | 4 ++++
tools/testing/selftests/drivers/net/bonding/netcons_over_bonding.sh | 221 +++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
tools/testing/selftests/drivers/net/lib/sh/lib_netcons.sh | 189 +++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++------------------
tools/testing/selftests/drivers/net/netcons_torture.sh | 127 +++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
7 files changed, 531 insertions(+), 20 deletions(-)
---
base-commit: f1455695d2d99894b65db233877acac9a0e120b9
change-id: 20250902-netconsole_torture-8fc23f0aca99
Best regards,
--
Breno Leitao <leitao(a)debian.org>
This is the mail system at host zihnyunrui.com.
I'm sorry to have to inform you that your message could not
be delivered to one or more recipients. It's attached below.
For further assistance, please send mail to postmaster.
If you do so, please include this problem report. You can
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The mail system
<linux-stable-mirror(a)lists.linaro.org>: host lists.linaro.org[3.208.193.21]
said: 554 5.7.1 Spam message rejected (in reply to end of DATA command)
This is the start of the stable review cycle for the 6.12.50 release.
There are 89 patches in this series, all will be posted as a response
to this one. If anyone has any issues with these being applied, please
let me know.
Responses should be made by Thu, 02 Oct 2025 14:37:59 +0000.
Anything received after that time might be too late.
The whole patch series can be found in one patch at:
https://www.kernel.org/pub/linux/kernel/v6.x/stable-review/patch-6.12.50-rc…
or in the git tree and branch at:
git://git.kernel.org/pub/scm/linux/kernel/git/stable/linux-stable-rc.git linux-6.12.y
and the diffstat can be found below.
thanks,
greg k-h
-------------
Pseudo-Shortlog of commits:
Greg Kroah-Hartman <gregkh(a)linuxfoundation.org>
Linux 6.12.50-rc1
Niklas Neronin <niklas.neronin(a)linux.intel.com>
Revert "usb: xhci: remove option to change a default ring's TRB cycle bit"
Jason Gunthorpe <jgg(a)ziepe.ca>
iommufd: Fix race during abort for file descriptors
Thomas Zimmermann <tzimmermann(a)suse.de>
fbcon: Fix OOB access in font allocation
Samasth Norway Ananda <samasth.norway.ananda(a)oracle.com>
fbcon: fix integer overflow in fbcon_do_set_font
Jinjiang Tu <tujinjiang(a)huawei.com>
mm/hugetlb: fix folio is still mapped when deleted
Eric Biggers <ebiggers(a)kernel.org>
kmsan: fix out-of-bounds access to shadow memory
Hans de Goede <hansg(a)kernel.org>
gpiolib: Extend software-node support to support secondary software-nodes
Jakub Acs <acsjakub(a)amazon.de>
fs/proc/task_mmu: check p->vec_buf for NULL
Zhen Ni <zhen.ni(a)easystack.cn>
afs: Fix potential null pointer dereference in afs_put_server
Nirmoy Das <nirmoyd(a)nvidia.com>
drm/ast: Use msleep instead of mdelay for edid read
Josua Mayer <josua(a)solid-run.com>
arm64: dts: marvell: cn9132-clearfog: fix multi-lane pci x2 and x4 ports
Josua Mayer <josua(a)solid-run.com>
arm64: dts: marvell: cn9132-clearfog: disable eMMC high-speed modes
Nobuhiro Iwamatsu <iwamatsu(a)nigauri.org>
ARM: dts: socfpga: sodia: Fix mdio bus probe and PHY address
Masami Hiramatsu (Google) <mhiramat(a)kernel.org>
tracing: dynevent: Add a missing lockdown check on dynevent
Eric Biggers <ebiggers(a)kernel.org>
crypto: af_alg - Fix incorrect boolean values in af_alg_ctx
Lukasz Czapnik <lukasz.czapnik(a)intel.com>
i40e: improve VF MAC filters accounting
Lukasz Czapnik <lukasz.czapnik(a)intel.com>
i40e: add mask to apply valid bits for itr_idx
Lukasz Czapnik <lukasz.czapnik(a)intel.com>
i40e: add max boundary check for VF filters
Lukasz Czapnik <lukasz.czapnik(a)intel.com>
i40e: fix validation of VF state in get resources
Lukasz Czapnik <lukasz.czapnik(a)intel.com>
i40e: fix input validation logic for action_meta
Lukasz Czapnik <lukasz.czapnik(a)intel.com>
i40e: fix idx validation in config queues msg
Lukasz Czapnik <lukasz.czapnik(a)intel.com>
i40e: fix idx validation in i40e_validate_queue_map
Lukasz Czapnik <lukasz.czapnik(a)intel.com>
i40e: add validation for ring_len param
Amit Chaudhari <amitchaudhari(a)mac.com>
HID: asus: add support for missing PX series fn keys
Sang-Heon Jeon <ekffu200098(a)gmail.com>
smb: client: fix wrong index reference in smb2_compound_op()
Daniel Lee <dany97(a)live.ca>
platform/x86: lg-laptop: Fix WMAB call in fan_mode_store()
Adrián Larumbe <adrian.larumbe(a)collabora.com>
drm/panthor: Defer scheduler entitiy destruction to queue release
Sebastian Andrzej Siewior <bigeasy(a)linutronix.de>
futex: Prevent use-after-free during requeue-PI
Zabelin Nikita <n.zabelin(a)mt-integration.ru>
drm/gma500: Fix null dereference in hdmi teardown
Hugh Dickins <hughd(a)google.com>
mm: folio_may_be_lru_cached() unless folio_test_large()
Hugh Dickins <hughd(a)google.com>
mm: revert "mm/gup: clear the LRU flag of a page before adding to LRU batch"
Hugh Dickins <hughd(a)google.com>
mm/gup: local lru_add_drain() to avoid lru_add_drain_all()
Dan Carpenter <dan.carpenter(a)linaro.org>
octeontx2-pf: Fix potential use after free in otx2_tc_add_flow()
Vladimir Oltean <vladimir.oltean(a)nxp.com>
net: dsa: lantiq_gswip: suppress -EINVAL errors for bridge FDB entries added to the CPU port
Vladimir Oltean <vladimir.oltean(a)nxp.com>
net: dsa: lantiq_gswip: move gswip_add_single_port_br() call to port_setup()
Ido Schimmel <idosch(a)nvidia.com>
selftests: fib_nexthops: Fix creation of non-FDB nexthops
Ido Schimmel <idosch(a)nvidia.com>
nexthop: Forbid FDB status change while nexthop is in a group
Jason Baron <jbaron(a)akamai.com>
net: allow alloc_skb_with_frags() to use MAX_SKB_FRAGS
Alok Tiwari <alok.a.tiwari(a)oracle.com>
bnxt_en: correct offset handling for IPv6 destination address
Sebastian Andrzej Siewior <bigeasy(a)linutronix.de>
vhost: Take a reference on the task in struct vhost_task.
Luiz Augusto von Dentz <luiz.von.dentz(a)intel.com>
Bluetooth: hci_event: Fix UAF in hci_acl_create_conn_sync
Luiz Augusto von Dentz <luiz.von.dentz(a)intel.com>
Bluetooth: hci_sync: Fix hci_resume_advertising_sync
Petr Malat <oss(a)malat.biz>
ethernet: rvu-af: Remove slash from the driver name
Sidraya Jayagond <sidraya(a)linux.ibm.com>
net/smc: fix warning in smc_rx_splice() when calling get_page()
Wang Liang <wangliang74(a)huawei.com>
net: tun: Update napi->skb after XDP process
Stéphane Grosjean <stephane.grosjean(a)hms-networks.com>
can: peak_usb: fix shift-out-of-bounds issue
Vincent Mailhol <mailhol(a)kernel.org>
can: mcba_usb: populate ndo_change_mtu() to prevent buffer overflow
Vincent Mailhol <mailhol(a)kernel.org>
can: sun4i_can: populate ndo_change_mtu() to prevent buffer overflow
Vincent Mailhol <mailhol(a)kernel.org>
can: hi311x: populate ndo_change_mtu() to prevent buffer overflow
Vincent Mailhol <mailhol(a)kernel.org>
can: etas_es58x: populate ndo_change_mtu() to prevent buffer overflow
Sabrina Dubroca <sd(a)queasysnail.net>
xfrm: xfrm_alloc_spi shouldn't use 0 as SPI
Leon Hwang <leon.hwang(a)linux.dev>
bpf: Reject bpf_timer for PREEMPT_RT
Geert Uytterhoeven <geert+renesas(a)glider.be>
can: rcar_can: rcar_can_resume(): fix s2ram with PSCI
James Guan <guan_yufei(a)163.com>
wifi: virt_wifi: Fix page fault on connect
Mark Harmstone <mark(a)harmstone.com>
btrfs: don't allow adding block device of less than 1 MB
Jiri Olsa <olsajiri(a)gmail.com>
bpf: Check the helper function is valid in get_helper_proto
Stefan Metzmacher <metze(a)samba.org>
smb: server: use disable_work_sync in transport_rdma.c
Stefan Metzmacher <metze(a)samba.org>
smb: server: don't use delayed_work for post_recv_credits_work
Christian Loehle <christian.loehle(a)arm.com>
cpufreq: Initialize cpufreq-based invariance before subsys
Jihed Chaibi <jihed.chaibi.dev(a)gmail.com>
ARM: dts: kirkwood: Fix sound DAI cells for OpenRD clients
Peng Fan <peng.fan(a)nxp.com>
arm64: dts: imx8mp: Correct thermal sensor index
Peng Fan <peng.fan(a)nxp.com>
firmware: imx: Add stub functions for SCMI MISC API
Basavaraj Natikar <Basavaraj.Natikar(a)amd.com>
HID: amd_sfh: Add sync across amd sfh work functions
Or Har-Toov <ohartoov(a)nvidia.com>
IB/mlx5: Fix obj_type mismatch for SRQ event subscriptions
Aleksander Jan Bajkowski <olek2(a)wp.pl>
net: sfp: add quirk for FLYPRO copper SFP+ module
qaqland <anguoli(a)uniontech.com>
ALSA: usb-audio: Add mute TLV for playback volumes on more devices
Cryolitia PukNgae <cryolitia(a)uniontech.com>
ALSA: usb-audio: move mixer_quirks' min_mute into common quirk
noble.yang <noble.yang(a)comtrue-inc.com>
ALSA: usb-audio: Add DSD support for Comtrue USB Audio device
Heikki Krogerus <heikki.krogerus(a)linux.intel.com>
i2c: designware: Add quirk for Intel Xe
Benoît Monin <benoit.monin(a)bootlin.com>
mmc: sdhci-cadence: add Mobileye eyeQ support
Chris Morgan <macromorgan(a)hotmail.com>
net: sfp: add quirk for Potron SFP+ XGSPON ONU Stick
Marc Kleine-Budde <mkl(a)pengutronix.de>
net: fec: rename struct fec_devinfo fec_imx6x_info -> fec_imx6sx_info
Jiayi Li <lijiayi(a)kylinos.cn>
usb: core: Add 0x prefix to quirks debug output
Takashi Iwai <tiwai(a)suse.de>
ALSA: usb-audio: Fix build with CONFIG_INPUT=n
Stefan Binding <sbinding(a)opensource.cirrus.com>
ALSA: hda/realtek: Add support for ASUS NUC using CS35L41 HDA
Chen Ni <nichen(a)iscas.ac.cn>
ALSA: usb-audio: Convert comma to semicolon
Kerem Karabay <kekrby(a)gmail.com>
HID: multitouch: specify that Apple Touch Bar is direct
Kerem Karabay <kekrby(a)gmail.com>
HID: multitouch: take cls->maxcontacts into account for Apple Touch Bar even without a HID_DG_CONTACTMAX field
Kerem Karabay <kekrby(a)gmail.com>
HID: multitouch: support getting the tip state from HID_DG_TOUCH fields in Apple Touch Bar
Kerem Karabay <kekrby(a)gmail.com>
HID: multitouch: Get the contact ID from HID_DG_TRANSDUCER_INDEX fields in case of Apple Touch Bar
Cristian Ciocaltea <cristian.ciocaltea(a)collabora.com>
ALSA: usb-audio: Add mixer quirk for Sony DualSense PS5
Cristian Ciocaltea <cristian.ciocaltea(a)collabora.com>
ALSA: usb-audio: Remove unneeded wmb() in mixer_quirks
Cristian Ciocaltea <cristian.ciocaltea(a)collabora.com>
ALSA: usb-audio: Simplify NULL comparison in mixer_quirks
Cristian Ciocaltea <cristian.ciocaltea(a)collabora.com>
ALSA: usb-audio: Avoid multiple assignments in mixer_quirks
Cristian Ciocaltea <cristian.ciocaltea(a)collabora.com>
ALSA: usb-audio: Drop unnecessary parentheses in mixer_quirks
Cristian Ciocaltea <cristian.ciocaltea(a)collabora.com>
ALSA: usb-audio: Fix block comments in mixer_quirks
Cristian Ciocaltea <cristian.ciocaltea(a)collabora.com>
ALSA: usb-audio: Fix code alignment in mixer_quirks
Takashi Sakamoto <o-takashi(a)sakamocchi.jp>
firewire: core: fix overlooked update of subsystem ABI version
Alok Tiwari <alok.a.tiwari(a)oracle.com>
scsi: ufs: mcq: Fix memory allocation checks for SQE and CQE
-------------
Diffstat:
Documentation/admin-guide/laptops/lg-laptop.rst | 4 +-
Makefile | 4 +-
.../dts/intel/socfpga/socfpga_cyclone5_sodia.dts | 6 +-
.../boot/dts/marvell/kirkwood-openrd-client.dts | 2 +-
arch/arm64/boot/dts/freescale/imx8mp.dtsi | 4 +-
arch/arm64/boot/dts/marvell/cn9132-clearfog.dts | 16 +-
arch/arm64/boot/dts/marvell/cn9132-sr-cex7.dtsi | 8 +
drivers/cpufreq/cpufreq.c | 20 +-
drivers/firewire/core-cdev.c | 2 +-
drivers/gpio/gpiolib.c | 21 +-
drivers/gpu/drm/ast/ast_dp.c | 2 +-
drivers/gpu/drm/gma500/oaktrail_hdmi.c | 2 +-
drivers/gpu/drm/panthor/panthor_sched.c | 8 +-
drivers/hid/amd-sfh-hid/amd_sfh_client.c | 12 +-
drivers/hid/amd-sfh-hid/amd_sfh_common.h | 3 +
drivers/hid/amd-sfh-hid/amd_sfh_pcie.c | 4 +
drivers/hid/hid-asus.c | 3 +
drivers/hid/hid-multitouch.c | 45 +-
drivers/i2c/busses/i2c-designware-platdrv.c | 7 +-
drivers/infiniband/hw/mlx5/devx.c | 1 +
drivers/iommu/iommufd/fault.c | 4 +-
drivers/iommu/iommufd/main.c | 34 +-
drivers/mmc/host/sdhci-cadence.c | 11 +
drivers/net/can/rcar/rcar_can.c | 8 +-
drivers/net/can/spi/hi311x.c | 1 +
drivers/net/can/sun4i_can.c | 1 +
drivers/net/can/usb/etas_es58x/es58x_core.c | 3 +-
drivers/net/can/usb/mcba_usb.c | 1 +
drivers/net/can/usb/peak_usb/pcan_usb_core.c | 2 +-
drivers/net/dsa/lantiq_gswip.c | 21 +-
drivers/net/ethernet/broadcom/bnxt/bnxt_tc.c | 2 +-
drivers/net/ethernet/freescale/fec_main.c | 4 +-
drivers/net/ethernet/intel/i40e/i40e.h | 3 +-
drivers/net/ethernet/intel/i40e/i40e_main.c | 26 +-
drivers/net/ethernet/intel/i40e/i40e_virtchnl_pf.c | 110 +++--
drivers/net/ethernet/intel/i40e/i40e_virtchnl_pf.h | 3 +-
drivers/net/ethernet/marvell/octeontx2/af/cgx.c | 3 +-
.../net/ethernet/marvell/octeontx2/nic/otx2_tc.c | 2 +-
drivers/net/phy/sfp.c | 24 +-
drivers/net/tun.c | 3 +
drivers/net/wireless/virtual/virt_wifi.c | 4 +-
drivers/platform/x86/lg-laptop.c | 34 +-
drivers/ufs/core/ufs-mcq.c | 4 +-
drivers/usb/core/quirks.c | 2 +-
drivers/usb/host/xhci-dbgcap.c | 2 +-
drivers/usb/host/xhci-mem.c | 50 +-
drivers/usb/host/xhci.c | 2 +-
drivers/usb/host/xhci.h | 6 +-
drivers/video/fbdev/core/fbcon.c | 13 +-
fs/afs/server.c | 3 +-
fs/btrfs/volumes.c | 5 +
fs/hugetlbfs/inode.c | 10 +-
fs/proc/task_mmu.c | 3 +
fs/smb/client/smb2inode.c | 2 +-
fs/smb/server/transport_rdma.c | 22 +-
include/crypto/if_alg.h | 2 +-
include/linux/firmware/imx/sm.h | 12 +
include/linux/swap.h | 10 +
include/net/bluetooth/hci_core.h | 21 +
kernel/bpf/core.c | 5 +-
kernel/bpf/verifier.c | 6 +-
kernel/futex/requeue.c | 6 +-
kernel/trace/trace_dynevent.c | 4 +
kernel/vhost_task.c | 3 +-
mm/gup.c | 15 +-
mm/kmsan/core.c | 10 +-
mm/kmsan/kmsan_test.c | 16 +
mm/mlock.c | 6 +-
mm/swap.c | 51 +-
net/bluetooth/hci_event.c | 26 +-
net/bluetooth/hci_sync.c | 7 +
net/core/skbuff.c | 2 +-
net/ipv4/nexthop.c | 7 +
net/smc/smc_loopback.c | 14 +-
net/xfrm/xfrm_state.c | 3 +
sound/pci/hda/patch_realtek.c | 11 +
sound/usb/mixer_quirks.c | 545 +++++++++++++++------
sound/usb/quirks.c | 24 +-
sound/usb/usbaudio.h | 4 +
tools/testing/selftests/net/fib_nexthops.sh | 12 +-
80 files changed, 1037 insertions(+), 387 deletions(-)
Hello,
I want a quote and I would like to know your availability so that
i can send you the necessary documents as well as drawings and
specification.
Best regards
Tony
Hello,
I want a quote and I would like to know your availability so that
i can send you the necessary documents as well as drawings and
specification.
Best regards
Tony
iommu/amd: fix amd iotlb flush range in unmap
This was fixed in mainline in 6b080c4e815ceba3c08ffa980c858595c07e786a,
but do not backport the full refactor.
Targeting branch lts linux-5.15.y.
AMD IOMMU driver supports power of 2 KB page size, it can be 4K, 8K,
16K, etc. So when VFIO driver ask AMD IOMMU driver to unmap a
IOVA with a page_size 4K, it actually can unmap a page_size of
8K, depending on the page used during mapping. However, the iotlb
gather function use the page_size as the range of unmap range,
instead of the real unmapped page size r.
This miscalculation of iotlb flush range will make the unflushed
IOTLB entry stale. It triggered hard-to-debug silent data corruption
issue as DMA engine who used the stale IOTLB entry will DMA into
unmapped memory region.
The upstream commit aims at changing API from map/unmap_page() to
map/unmap_pages() and changed the gather range calculation along
with it. It accidentally fixed this bug in the mainline since 6.1.
For this backport, we don't backport the API change, only port the
gather range calculation to fix the bug.
Cc: Nadav Amit <namit(a)vmware.com>
Cc: Joerg Roedel <joro(a)8bytes.org>
Cc: Will Deacon <will(a)kernel.org>
Cc: Robin Murphy <robin.murphy(a)arm.com>
Cc: Lu Baolu <baolu.lu(a)linux.intel.com>
Cc: iommu(a)lists.linux-foundation.org
Fixes: fc65d0acaf23179b94de399c204328fa259acb90
Signed-off-by: Zhichuang Sun <zhichuang(a)google.com>
---
drivers/iommu/amd/iommu.c | 3 ++-
1 file changed, 2 insertions(+), 1 deletion(-)
diff --git a/drivers/iommu/amd/iommu.c b/drivers/iommu/amd/iommu.c
index 714c78bf69db..d3a11be8d1dd 100644
--- a/drivers/iommu/amd/iommu.c
+++ b/drivers/iommu/amd/iommu.c
@@ -2121,7 +2121,8 @@ static size_t amd_iommu_unmap(struct iommu_domain *dom, unsigned long iova,
r = (ops->unmap) ? ops->unmap(ops, iova, page_size, gather) : 0;
- amd_iommu_iotlb_gather_add_page(dom, gather, iova, page_size);
+ if (r)
+ amd_iommu_iotlb_gather_add_page(dom, gather, iova, r);
return r;
}
--
2.51.0.618.g983fd99d29-goog
This series backports 19 patches to update minmax.h in the 5.15.y branch,
aligning it with v6.17-rc7.
The ultimate goal is to synchronize all longterm branches so that they
include the full set of minmax.h changes (6.12.y and 6.6.y were already
backported by me and are now aligned, 6.1.y is in progress).
The key motivation is to bring in commit d03eba99f5bf ("minmax: allow
min()/max()/clamp() if the arguments have the same signedness"), which
is missing in kernel 5.10.y.
In mainline, this change enables min()/max()/clamp() to accept mixed
argument types, provided both have the same signedness. Without it,
backported patches that use these forms may trigger compiler warnings,
which escalate to build failures when -Werror is enabled.
Andy Shevchenko (1):
minmax: deduplicate __unconst_integer_typeof()
David Laight (8):
minmax: fix indentation of __cmp_once() and __clamp_once()
minmax.h: add whitespace around operators and after commas
minmax.h: update some comments
minmax.h: reduce the #define expansion of min(), max() and clamp()
minmax.h: use BUILD_BUG_ON_MSG() for the lo < hi test in clamp()
minmax.h: move all the clamp() definitions after the min/max() ones
minmax.h: simplify the variants of clamp()
minmax.h: remove some #defines that are only expanded once
Herve Codina (1):
minmax: Introduce {min,max}_array()
Linus Torvalds (8):
minmax: avoid overly complicated constant expressions in VM code
minmax: make generic MIN() and MAX() macros available everywhere
minmax: add a few more MIN_T/MAX_T users
minmax: simplify and clarify min_t()/max_t() implementation
minmax: simplify min()/max()/clamp() implementation
minmax: don't use max() in situations that want a C constant
expression
minmax: improve macro expansion and type checking
minmax: fix up min3() and max3() too
Matthew Wilcox (Oracle) (1):
minmax: add in_range() macro
arch/arm/mm/pageattr.c | 6 +-
arch/um/drivers/mconsole_user.c | 2 +
arch/x86/mm/pgtable.c | 2 +-
drivers/edac/sb_edac.c | 4 +-
drivers/edac/skx_common.h | 1 -
drivers/gpu/drm/amd/amdgpu/amdgpu.h | 2 +
.../drm/amd/display/modules/hdcp/hdcp_ddc.c | 2 +
.../drm/amd/pm/powerplay/hwmgr/ppevvmath.h | 14 +-
.../amd/pm/swsmu/smu11/sienna_cichlid_ppt.c | 2 +
.../drm/arm/display/include/malidp_utils.h | 2 +-
.../display/komeda/komeda_pipeline_state.c | 24 +-
drivers/gpu/drm/drm_color_mgmt.c | 2 +-
drivers/gpu/drm/msm/adreno/a6xx_gmu.c | 6 -
drivers/gpu/drm/radeon/evergreen_cs.c | 2 +
drivers/hwmon/adt7475.c | 24 +-
drivers/input/touchscreen/cyttsp4_core.c | 2 +-
drivers/irqchip/irq-sun6i-r.c | 2 +-
drivers/md/dm-integrity.c | 4 +-
drivers/media/dvb-frontends/stv0367_priv.h | 3 +
.../net/ethernet/chelsio/cxgb3/cxgb3_main.c | 18 +-
.../net/ethernet/stmicro/stmmac/stmmac_main.c | 2 +-
drivers/net/fjes/fjes_main.c | 4 +-
drivers/nfc/pn544/i2c.c | 2 -
drivers/platform/x86/sony-laptop.c | 1 -
drivers/scsi/isci/init.c | 6 +-
.../pci/hive_isp_css_include/math_support.h | 5 -
drivers/virt/acrn/ioreq.c | 4 +-
fs/btrfs/misc.h | 2 -
fs/btrfs/tree-checker.c | 2 +-
fs/ext2/balloc.c | 2 -
fs/ext4/ext4.h | 2 -
fs/ufs/util.h | 6 -
include/linux/compiler.h | 9 +
include/linux/minmax.h | 264 +++++++++++++-----
kernel/trace/preemptirq_delay_test.c | 2 -
lib/btree.c | 1 -
lib/decompress_unlzma.c | 2 +
lib/logic_pio.c | 3 -
lib/vsprintf.c | 2 +-
lib/zstd/zstd_internal.h | 2 -
mm/zsmalloc.c | 1 -
net/ipv4/proc.c | 2 +-
net/ipv6/proc.c | 2 +-
net/netfilter/nf_nat_core.c | 6 +-
net/tipc/core.h | 2 +-
net/tipc/link.c | 10 +-
tools/testing/selftests/vm/mremap_test.c | 2 +
47 files changed, 289 insertions(+), 183 deletions(-)
--
2.47.3
Since v6.1.154, mptcp selftests have failed to build with the following
errors:
mptcp_connect.c: In function ‘main_loop_s’:
mptcp_connect.c:1040:59: error: ‘winfo’ undeclared (first use in this function)
1040 | err = copyfd_io(fd, remotesock, 1, true, &winfo);
| ^~~~~
mptcp_connect.c:1040:59: note: each undeclared identifier is reported only once for each function it appears in
mptcp_connect.c:1040:23: error: too many arguments to function ‘copyfd_io’; expected 4, have 5
1040 | err = copyfd_io(fd, remotesock, 1, true, &winfo);
| ^~~~~~~~~ ~~~~~~
mptcp_connect.c:845:12: note: declared here
845 | static int copyfd_io(int infd, int peerfd, int outfd, bool close_peerfd)
| ^~~~~~~~~
This is caused by commit ff160500c499 ("selftests: mptcp: connect: catch
IO errors on listen side"), a backport of upstream 14e22b43df25,
which attempts to use the undeclared variable 'winfo' and passes too many
arguments to copyfd_io(). Both the winfo variable and the updated
copyfd_io() function were introduced in upstream
commit ca7ae8916043 ("selftests: mptcp: mptfo Initiator/Listener"),
which is not present in v6.1.y.
The goal of the backport is to stop on errors from copyfd_io.
Therefore, the backport does not depend on the changes in upstream
commit ca7ae8916043 ("selftests: mptcp: mptfo Initiator/Listener").
This commit simply removes ', &winfo' to fix a build failure.
Fixes: ff160500c499 ("selftests: mptcp: connect: catch IO errors on listen side")
Signed-off-by: Kenta Akagi <k(a)mgml.me>
---
commit 14e22b43df25 ("selftests: mptcp: connect: catch IO errors
on listen side") has only been backported to >=v6.1.y, and commit
ca7ae8916043 ("selftests: mptcp: mptfo Initiator/Listener")
exists from v6.2. so, only v6.1.y requires this fix.
---
tools/testing/selftests/net/mptcp/mptcp_connect.c | 2 +-
1 file changed, 1 insertion(+), 1 deletion(-)
diff --git a/tools/testing/selftests/net/mptcp/mptcp_connect.c b/tools/testing/selftests/net/mptcp/mptcp_connect.c
index 0d49b6753011..0b253c133f06 100644
--- a/tools/testing/selftests/net/mptcp/mptcp_connect.c
+++ b/tools/testing/selftests/net/mptcp/mptcp_connect.c
@@ -1037,7 +1037,7 @@ int main_loop_s(int listensock)
SOCK_TEST_TCPULP(remotesock, 0);
- err = copyfd_io(fd, remotesock, 1, true, &winfo);
+ err = copyfd_io(fd, remotesock, 1, true);
} else {
perror("accept");
return 1;
--
2.50.1
Similarly to pci_dev_aer_stats_incr(), pci_print_aer() may be called
when dev->aer_info is NULL. Add a NULL check before proceeding to avoid
calling aer_ratelimit() with a NULL aer_info pointer, returning 1, which
does not rate limit, given this is fatal.
This prevents a kernel crash triggered by dereferencing a NULL pointer
in aer_ratelimit(), ensuring safer handling of PCI devices that lack
AER info. This change aligns pci_print_aer() with pci_dev_aer_stats_incr()
which already performs this NULL check.
Cc: stable(a)vger.kernel.org
Fixes: a57f2bfb4a5863 ("PCI/AER: Ratelimit correctable and non-fatal error logging")
Signed-off-by: Breno Leitao <leitao(a)debian.org>
---
- This problem is still happening in upstream, and unfortunately no action
was done in the previous discussion.
- Link to previous post:
https://lore.kernel.org/r/20250804-aer_crash_2-v1-1-fd06562c18a4@debian.org
---
drivers/pci/pcie/aer.c | 3 +++
1 file changed, 3 insertions(+)
diff --git a/drivers/pci/pcie/aer.c b/drivers/pci/pcie/aer.c
index e286c197d7167..55abc5e17b8b1 100644
--- a/drivers/pci/pcie/aer.c
+++ b/drivers/pci/pcie/aer.c
@@ -786,6 +786,9 @@ static void pci_rootport_aer_stats_incr(struct pci_dev *pdev,
static int aer_ratelimit(struct pci_dev *dev, unsigned int severity)
{
+ if (!dev->aer_info)
+ return 1;
+
switch (severity) {
case AER_NONFATAL:
return __ratelimit(&dev->aer_info->nonfatal_ratelimit);
---
base-commit: e5f0a698b34ed76002dc5cff3804a61c80233a7a
change-id: 20250801-aer_crash_2-b21cc2ef0d00
Best regards,
--
Breno Leitao <leitao(a)debian.org>
This series backports 13 patches to update minmax.h in the 6.1.y branch,
aligning it with v6.17-rc7.
The ultimate goal is to synchronize all longterm branches so that they
include the full set of minmax.h changes (6.12.y and 6.6.y were already
backported by me and are now ligned).
The key motivation is to bring in commit d03eba99f5bf ("minmax: allow
min()/max()/clamp() if the arguments have the same signedness"), which
is missing in older kernels.
In mainline, this change enables min()/max()/clamp() to accept mixed
argument types, provided both have the same signedness. Without it,
backported patches that use these forms may trigger compiler warnings,
which escalate to build failures when -Werror is enabled.
Changes in v3:
- v2 included 13 patches:
https://lore.kernel.org/stable/20250929183358.18982-1-farbere@amazon.com/
- First 2 were accepted and are part of 6.1.155.
- 3rd caused build in drivers/md/ to fail:
In file included from ./include/linux/container_of.h:5,
from ./include/linux/list.h:5,
from ./include/linux/wait.h:7,
from ./include/linux/mempool.h:8,
from ./include/linux/bio.h:8,
from drivers/md/dm-bio-record.h:10,
from drivers/md/dm-integrity.c:9:
drivers/md/dm-integrity.c: In function ‘integrity_metadata’:
drivers/md/dm-integrity.c:131:105: error: ISO C90 forbids variable length array ‘checksums_onstack’ [-Werror=vla]
131 | #define MAX_TAG_SIZE (JOURNAL_SECTOR_DATA - JOURNAL_MAC_PER_SECTOR - offsetof(struct journal_entry, last_bytes[MAX_SECTORS_PER_BLOCK]))
| ^~~~~~~~~~~~~
./include/linux/build_bug.h:78:56: note: in definition of macro ‘__static_assert’
78 | #define __static_assert(expr, msg, ...) _Static_assert(expr, msg)
| ^~~~
./include/linux/minmax.h:56:9: note: in expansion of macro ‘static_assert’
56 | static_assert(__types_ok(x, y, ux, uy), \
| ^~~~~~~~~~~~~
./include/linux/minmax.h:41:31: note: in expansion of macro ‘__is_noneg_int’
41 | __is_noneg_int(x) || __is_noneg_int(y))
| ^~~~~~~~~~~~~~
./include/linux/minmax.h:56:23: note: in expansion of macro ‘__types_ok’
56 | static_assert(__types_ok(x, y, ux, uy), \
| ^~~~~~~~~~
./include/linux/minmax.h:61:9: note: in expansion of macro ‘__careful_cmp_once’
61 | __careful_cmp_once(op, x, y, __UNIQUE_ID(x_), __UNIQUE_ID(y_))
| ^~~~~~~~~~~~~~~~~~
./include/linux/minmax.h:92:25: note: in expansion of macro ‘__careful_cmp’
92 | #define max(x, y) __careful_cmp(max, x, y)
| ^~~~~~~~~~~~~
drivers/md/dm-integrity.c:1797:40: note: in expansion of macro ‘max’
1797 | char checksums_onstack[max((size_t)HASH_MAX_DIGESTSIZE, MAX_TAG_SIZE)];
| ^~~
drivers/md/dm-integrity.c:131:89: note: in expansion of macro ‘offsetof’
131 | #define MAX_TAG_SIZE (JOURNAL_SECTOR_DATA - JOURNAL_MAC_PER_SECTOR - offsetof(struct journal_entry, last_bytes[MAX_SECTORS_PER_BLOCK]))
| ^~~~~~~~
drivers/md/dm-integrity.c:1797:73: note: in expansion of macro ‘MAX_TAG_SIZE’
1797 | char checksums_onstack[max((size_t)HASH_MAX_DIGESTSIZE, MAX_TAG_SIZE)];
| ^~~~~~~~~~~~
- The build was fixed in the second patch of this series.
Changes in v2:
- v1 included 19 patches:
https://lore.kernel.org/stable/20250924202320.32333-1-farbere@amazon.com/
- First 6 were pushed to the stable-tree.
- 7th cauded amd driver's build to fail.
- This change fixes it.
- Modified files:
drivers/gpu/drm/amd/amdgpu/amdgpu.h
drivers/gpu/drm/amd/pm/swsmu/smu11/sienna_cichlid_ppt.c
drivers/gpu/drm/amd/pm/swsmu/smu13/smu_v13_0_0_ppt.c
drivers/gpu/drm/amd/pm/swsmu/smu13/smu_v13_0_7_ppt.c
David Laight (7):
minmax.h: add whitespace around operators and after commas
minmax.h: update some comments
minmax.h: reduce the #define expansion of min(), max() and clamp()
minmax.h: use BUILD_BUG_ON_MSG() for the lo < hi test in clamp()
minmax.h: move all the clamp() definitions after the min/max() ones
minmax.h: simplify the variants of clamp()
minmax.h: remove some #defines that are only expanded once
Linus Torvalds (4):
minmax: simplify min()/max()/clamp() implementation
minmax: don't use max() in situations that want a C constant
expression
minmax: improve macro expansion and type checking
minmax: fix up min3() and max3() too
drivers/gpu/drm/amd/pm/swsmu/smu_cmn.c | 2 +-
drivers/input/touchscreen/cyttsp4_core.c | 2 +-
drivers/irqchip/irq-sun6i-r.c | 2 +-
drivers/md/dm-integrity.c | 2 +-
fs/btrfs/tree-checker.c | 2 +-
include/linux/compiler.h | 9 +
include/linux/minmax.h | 222 +++++++++++++----------
lib/vsprintf.c | 2 +-
8 files changed, 143 insertions(+), 100 deletions(-)
--
2.47.3
Hi,
CHanges since v2:
- SHA fix for the last commit, tripple checked them
Changes since v1:
- SHAs for Fixes tag corrected (sorry)
The size of the DSP host buffer was incorrectly defined as 2ms while
it is 4ms and the ChainDMA PCMs are using 5ms as host facing buffer.
The constraint will be set against the period time rather than the buffer
time to make sure that application will not face with xruns when the
DMA bursts to refill the host buffer.
The minimal period size will be also used by Pipewire in case of SOF
cards to set the headroom to a length which will avoid the cases when
the hw_ptr jumps over the appl_ptr because of a burst.
Iow, it will make Pipewire to keep a safe distance from the hw_ptr.
https://github.com/thesofproject/linux/issues/5284https://gitlab.freedesktop.org/pipewire/wireplumber/-/merge_requests/740https://gitlab.freedesktop.org/pipewire/pipewire/-/merge_requests/2548
Regards,
Peter
---
Peter Ujfalusi (3):
ASoC: SOF: ipc4-topology: Correct the minimum host DMA buffer size
ASoC: SOF: ipc4-topology: Account for different ChainDMA host buffer
size
ASoC: SOF: Intel: hda-pcm: Place the constraint on period time instead
of buffer time
sound/soc/sof/intel/hda-pcm.c | 29 +++++++++++++++++++++--------
sound/soc/sof/ipc4-topology.c | 9 +++++++--
sound/soc/sof/ipc4-topology.h | 7 +++++--
3 files changed, 33 insertions(+), 12 deletions(-)
--
2.51.0
Hi,
The size of the DSP host buffer was incorrectly defined as 2ms while
it is 4ms and the ChainDMA PCMs are using 5ms as host facing buffer.
The constraint will be set against the period time rather than the buffer
time to make sure that application will not face with xruns when the
DMA bursts to refill the host buffer.
The minimal period size will be also used by Pipewire in case of SOF
cards to set the headroom to a length which will avoid the cases when
the hw_ptr jumps over the appl_ptr because of a burst.
Iow, it will make Pipewire to keep a safe distance from the hw_ptr.
https://github.com/thesofproject/linux/issues/5284https://gitlab.freedesktop.org/pipewire/wireplumber/-/merge_requests/740https://gitlab.freedesktop.org/pipewire/pipewire/-/merge_requests/2548
Regards,
Peter
---
Peter Ujfalusi (3):
ASoC: SOF: ipc4-topology: Correct the minimum host DMA buffer size
ASoC: SOF: ipc4-topology: Account for different ChainDMA host buffer
size
ASoC: SOF: Intel: hda-pcm: Place the constraint on period time instead
of buffer time
sound/soc/sof/intel/hda-pcm.c | 29 +++++++++++++++++++++--------
sound/soc/sof/ipc4-topology.c | 9 +++++++--
sound/soc/sof/ipc4-topology.h | 7 +++++--
3 files changed, 33 insertions(+), 12 deletions(-)
--
2.51.0
Loading a large (~2.1G) files with kexec crashes the host with when
running:
# kexec --load kernel --initrd initrd_with_2G_or_more
UBSAN: signed-integer-overflow in ./include/crypto/sha256_base.h:64:19
34152083 * 64 cannot be represented in type 'int'
...
BUG: unable to handle page fault for address: ff9fffff83b624c0
sha256_update (lib/crypto/sha256.c:137)
crypto_sha256_update (crypto/sha256_generic.c:40)
kexec_calculate_store_digests (kernel/kexec_file.c:769)
__se_sys_kexec_file_load (kernel/kexec_file.c:397 kernel/kexec_file.c:332)
...
(Line numbers based on commit da274362a7bd9 ("Linux 6.12.49")
This started happening after commit f4da7afe07523f
("kexec_file: increase maximum file size to 4G") that landed in v6.0,
which increased the file size for kexec.
This is not happening upstream (v6.16+), given that `block` type was
upgraded from "int" to "size_t" in commit 74a43a2cf5e8 ("crypto:
lib/sha256 - Move partial block handling out")
Upgrade the block type similar to the commit above, avoiding hitting the
overflow.
This patch is only suitable for the stable tree, and before 6.16, which
got commit 74a43a2cf5e8 ("crypto: lib/sha256 - Move partial block
handling out"). This is not required before f4da7afe07523f ("kexec_file:
increase maximum file size to 4G"). In other words, this fix is required
between versions v6.0 and v6.16.
Signed-off-by: Breno Leitao <leitao(a)debian.org>
Fixes: f4da7afe07523f ("kexec_file: increase maximum file size to 4G") # Before v6.16
Reported-by: Michael van der Westhuizen <rmikey(a)meta.com>
Reported-by: Tobias Fleig <tfleig(a)meta.com>
---
Changes in v2:
- s/size_t/unsigned int/ as suggested by Eric
- Tag the commit that introduce the problem as Fixes, making backport easier.
- Link to v1: https://lore.kernel.org/r/20251001-stable_crash-v1-1-3071c0bd795e@debian.org
---
include/crypto/sha256_base.h | 2 +-
1 file changed, 1 insertion(+), 1 deletion(-)
diff --git a/include/crypto/sha256_base.h b/include/crypto/sha256_base.h
index e0418818d63c8..e3e610cfe8d30 100644
--- a/include/crypto/sha256_base.h
+++ b/include/crypto/sha256_base.h
@@ -44,7 +44,7 @@ static inline int lib_sha256_base_do_update(struct sha256_state *sctx,
sctx->count += len;
if (unlikely((partial + len) >= SHA256_BLOCK_SIZE)) {
- int blocks;
+ unsigned int blocks;
if (partial) {
int p = SHA256_BLOCK_SIZE - partial;
---
base-commit: da274362a7bd9ab3a6e46d15945029145ebce672
change-id: 20251001-stable_crash-f2151baf043b
Best regards,
--
Breno Leitao <leitao(a)debian.org>
From: Ranjani Sridharan <ranjani.sridharan(a)linux.intel.com>
In the case of static pipelines, freeing the widgets in the pipelines
that were not suspended after freeing the scheduler widgets results in
errors because the secondary cores are powered off when the scheduler
widgets are freed. Fix this by tearing down the leftover pipelines before
powering off the secondary cores.
Cc: stable(a)vger.kernel.org
Fixes: d7332c4a4f1a ("ASoC: SOF: ipc3-topology: Fix pipeline tear down logic")
Signed-off-by: Ranjani Sridharan <ranjani.sridharan(a)linux.intel.com>
Reviewed-by: Péter Ujfalusi <peter.ujfalusi(a)linux.intel.com>
Reviewed-by: Kai Vehmanen <kai.vehmanen(a)linux.intel.com>
Signed-off-by: Peter Ujfalusi <peter.ujfalusi(a)linux.intel.com>
---
sound/soc/sof/ipc3-topology.c | 10 +++++-----
1 file changed, 5 insertions(+), 5 deletions(-)
diff --git a/sound/soc/sof/ipc3-topology.c b/sound/soc/sof/ipc3-topology.c
index 473d416bc910..f449362a2905 100644
--- a/sound/soc/sof/ipc3-topology.c
+++ b/sound/soc/sof/ipc3-topology.c
@@ -2473,11 +2473,6 @@ static int sof_ipc3_tear_down_all_pipelines(struct snd_sof_dev *sdev, bool verif
if (ret < 0)
return ret;
- /* free all the scheduler widgets now */
- ret = sof_ipc3_free_widgets_in_list(sdev, true, &dyn_widgets, verify);
- if (ret < 0)
- return ret;
-
/*
* Tear down all pipelines associated with PCMs that did not get suspended
* and unset the prepare flag so that they can be set up again during resume.
@@ -2493,6 +2488,11 @@ static int sof_ipc3_tear_down_all_pipelines(struct snd_sof_dev *sdev, bool verif
}
}
+ /* free all the scheduler widgets now. This will also power down the secondary cores */
+ ret = sof_ipc3_free_widgets_in_list(sdev, true, &dyn_widgets, verify);
+ if (ret < 0)
+ return ret;
+
list_for_each_entry(sroute, &sdev->route_list, list)
sroute->setup = false;
--
2.51.0
From: Viacheslav Dubeyko <slava(a)dubeyko.com>
[ Upstream commit 2048ec5b98dbdfe0b929d2e42dc7a54c389c53dd ]
The syzbot reported issue in hfs_find_set_zero_bits():
=====================================================
BUG: KMSAN: uninit-value in hfs_find_set_zero_bits+0x74d/0xb60 fs/hfs/bitmap.c:45
hfs_find_set_zero_bits+0x74d/0xb60 fs/hfs/bitmap.c:45
hfs_vbm_search_free+0x13c/0x5b0 fs/hfs/bitmap.c:151
hfs_extend_file+0x6a5/0x1b00 fs/hfs/extent.c:408
hfs_get_block+0x435/0x1150 fs/hfs/extent.c:353
__block_write_begin_int+0xa76/0x3030 fs/buffer.c:2151
block_write_begin fs/buffer.c:2262 [inline]
cont_write_begin+0x10e1/0x1bc0 fs/buffer.c:2601
hfs_write_begin+0x85/0x130 fs/hfs/inode.c:52
cont_expand_zero fs/buffer.c:2528 [inline]
cont_write_begin+0x35a/0x1bc0 fs/buffer.c:2591
hfs_write_begin+0x85/0x130 fs/hfs/inode.c:52
hfs_file_truncate+0x1d6/0xe60 fs/hfs/extent.c:494
hfs_inode_setattr+0x964/0xaa0 fs/hfs/inode.c:654
notify_change+0x1993/0x1aa0 fs/attr.c:552
do_truncate+0x28f/0x310 fs/open.c:68
do_ftruncate+0x698/0x730 fs/open.c:195
do_sys_ftruncate fs/open.c:210 [inline]
__do_sys_ftruncate fs/open.c:215 [inline]
__se_sys_ftruncate fs/open.c:213 [inline]
__x64_sys_ftruncate+0x11b/0x250 fs/open.c:213
x64_sys_call+0xfe3/0x3db0 arch/x86/include/generated/asm/syscalls_64.h:78
do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]
do_syscall_64+0xd9/0x210 arch/x86/entry/syscall_64.c:94
entry_SYSCALL_64_after_hwframe+0x77/0x7f
Uninit was created at:
slab_post_alloc_hook mm/slub.c:4154 [inline]
slab_alloc_node mm/slub.c:4197 [inline]
__kmalloc_cache_noprof+0x7f7/0xed0 mm/slub.c:4354
kmalloc_noprof include/linux/slab.h:905 [inline]
hfs_mdb_get+0x1cc8/0x2a90 fs/hfs/mdb.c:175
hfs_fill_super+0x3d0/0xb80 fs/hfs/super.c:337
get_tree_bdev_flags+0x6e3/0x920 fs/super.c:1681
get_tree_bdev+0x38/0x50 fs/super.c:1704
hfs_get_tree+0x35/0x40 fs/hfs/super.c:388
vfs_get_tree+0xb0/0x5c0 fs/super.c:1804
do_new_mount+0x738/0x1610 fs/namespace.c:3902
path_mount+0x6db/0x1e90 fs/namespace.c:4226
do_mount fs/namespace.c:4239 [inline]
__do_sys_mount fs/namespace.c:4450 [inline]
__se_sys_mount+0x6eb/0x7d0 fs/namespace.c:4427
__x64_sys_mount+0xe4/0x150 fs/namespace.c:4427
x64_sys_call+0xfa7/0x3db0 arch/x86/include/generated/asm/syscalls_64.h:166
do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]
do_syscall_64+0xd9/0x210 arch/x86/entry/syscall_64.c:94
entry_SYSCALL_64_after_hwframe+0x77/0x7f
CPU: 1 UID: 0 PID: 12609 Comm: syz.1.2692 Not tainted 6.16.0-syzkaller #0 PREEMPT(none)
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 07/12/2025
=====================================================
The HFS_SB(sb)->bitmap buffer is allocated in hfs_mdb_get():
HFS_SB(sb)->bitmap = kmalloc(8192, GFP_KERNEL);
Finally, it can trigger the reported issue because kmalloc()
doesn't clear the allocated memory. If allocated memory contains
only zeros, then everything will work pretty fine.
But if the allocated memory contains the "garbage", then
it can affect the bitmap operations and it triggers
the reported issue.
This patch simply exchanges the kmalloc() on kzalloc()
with the goal to guarantee the correctness of bitmap operations.
Because, newly created allocation bitmap should have all
available blocks free. Potentially, initialization bitmap's read
operation could not fill the whole allocated memory and
"garbage" in the not initialized memory will be the reason of
volume coruptions and file system driver bugs.
Reported-by: syzbot <syzbot+773fa9d79b29bd8b6831(a)syzkaller.appspotmail.com>
Closes: https://syzkaller.appspot.com/bug?extid=773fa9d79b29bd8b6831
Signed-off-by: Viacheslav Dubeyko <slava(a)dubeyko.com>
cc: John Paul Adrian Glaubitz <glaubitz(a)physik.fu-berlin.de>
cc: Yangtao Li <frank.li(a)vivo.com>
cc: linux-fsdevel(a)vger.kernel.org
Link: https://lore.kernel.org/r/20250820230636.179085-1-slava@dubeyko.com
Signed-off-by: Viacheslav Dubeyko <slava(a)dubeyko.com>
Signed-off-by: Sasha Levin <sashal(a)kernel.org>
---
LLM Generated explanations, may be completely bogus:
## YES
This commit should be backported to stable kernel trees and **has
already been backported** (commit 71929d4dcb5ed in the current tree is
the backported version).
### Detailed Analysis
#### Bug Severity and Impact
**Critical filesystem corruption bug** present since 2016 (commit
80f8dccf95147f):
1. **Uninitialized Memory Issue**: The HFS bitmap buffer is allocated
with `kmalloc(8192, GFP_KERNEL)` at fs/hfs/mdb.c:175, but `kmalloc()`
does not zero memory. The subsequent bitmap read operation (lines
179-197) only reads `(fs_ablocks + 8) / 8` bytes from disk,
potentially leaving a large portion of the 8192-byte buffer
uninitialized.
2. **Quantified Impact**:
- Small filesystem (10,000 blocks): **84.7%** of bitmap uninitialized
(6,941 bytes)
- Medium filesystem (50,000 blocks): **23.7%** uninitialized (1,941
bytes)
- Only filesystems near 65,528 blocks fully initialize the buffer
3. **Real-World Consequences**:
- When `hfs_find_set_zero_bits()` (fs/hfs/bitmap.c:44) accesses the
bitmap at `val = *curr`, it reads uninitialized garbage
- This causes incorrect block allocation decisions during file
operations (extend, truncate, write)
- Can lead to filesystem corruption, data loss, or allocation
failures
- Detected by KMSAN during syzbot fuzzing, indicating real
exploitability
#### The Fix
**Perfect minimal fix** - single line change at fs/hfs/mdb.c:175:
```c
- HFS_SB(sb)->bitmap = kmalloc(8192, GFP_KERNEL);
+ HFS_SB(sb)->bitmap = kzalloc(8192, GFP_KERNEL);
```
`kzalloc()` guarantees zero-initialized memory, ensuring the bitmap
starts in a correct state where unread regions are treated as free (zero
bits).
#### Stable Backport Criteria Evaluation
✅ **Fixes user-affecting bug**: Prevents filesystem corruption and
incorrect block allocation
✅ **Small and contained**: Single line change, no side effects
✅ **No architectural changes**: Simple allocation function swap
✅ **Minimal regression risk**: Zero risk - only makes behavior more
correct
✅ **Confined to subsystem**: Only affects HFS filesystem code
✅ **Follows stable rules**: Important bugfix, minimal change, well-
tested (syzbot reported)
#### Context and History
- **Bug introduced**: 2016-01-02 by Al Viro (80f8dccf95147f) when
replacing `__get_free_pages()` with `kmalloc()`
- **Mainline fix**: 2025-08-20 (commit
2048ec5b98dbdfe0b929d2e42dc7a54c389c53dd)
- **Backport status**: Already backported to this tree (71929d4dcb5ed)
by Sasha Levin
- **Similar fixes**: Recent HFS bug fixes (slab-out-of-bounds, GPF
issues) typically include `Cc: stable(a)vger.kernel.org` and get
backported
- **Active maintenance**: 155 commits to fs/hfs/ since 2022, showing
continued bugfixing effort
#### Technical Review
The commit message correctly explains the issue and references the
syzkaller report. The fix is architecturally sound - the bitmap should
logically start with all blocks free (zero bits), so zero-initializing
the buffer is the correct approach rather than relying on disk data to
fill all 8192 bytes.
**Performance impact**: Negligible one-time cost of zeroing 8KB during
mount operation.
**Backport recommendation**: **STRONGLY RECOMMENDED** for all stable
trees supporting HFS filesystem.
fs/hfs/mdb.c | 2 +-
1 file changed, 1 insertion(+), 1 deletion(-)
diff --git a/fs/hfs/mdb.c b/fs/hfs/mdb.c
index 8082eb01127cd..bf811347bb07d 100644
--- a/fs/hfs/mdb.c
+++ b/fs/hfs/mdb.c
@@ -172,7 +172,7 @@ int hfs_mdb_get(struct super_block *sb)
pr_warn("continuing without an alternate MDB\n");
}
- HFS_SB(sb)->bitmap = kmalloc(8192, GFP_KERNEL);
+ HFS_SB(sb)->bitmap = kzalloc(8192, GFP_KERNEL);
if (!HFS_SB(sb)->bitmap)
goto out;
--
2.51.0
This is the start of the stable review cycle for the 6.1.154 release.
There are 61 patches in this series, all will be posted as a response
to this one. If anyone has any issues with these being applied, please
let me know.
Responses should be made by Wed, 24 Sep 2025 19:23:52 +0000.
Anything received after that time might be too late.
The whole patch series can be found in one patch at:
https://www.kernel.org/pub/linux/kernel/v6.x/stable-review/patch-6.1.154-rc…
or in the git tree and branch at:
git://git.kernel.org/pub/scm/linux/kernel/git/stable/linux-stable-rc.git linux-6.1.y
and the diffstat can be found below.
thanks,
greg k-h
-------------
Pseudo-Shortlog of commits:
Greg Kroah-Hartman <gregkh(a)linuxfoundation.org>
Linux 6.1.154-rc1
Herbert Xu <herbert(a)gondor.apana.org.au>
crypto: af_alg - Disallow concurrent writes in af_alg_sendmsg
David Howells <dhowells(a)redhat.com>
crypto: af_alg: Convert af_alg_sendpage() to use MSG_SPLICE_PAGES
Krzysztof Kozlowski <krzysztof.kozlowski(a)linaro.org>
ASoC: qcom: q6apm-lpass-dais: Fix NULL pointer dereference if source graph failed
Srinivas Kandagatla <srinivas.kandagatla(a)linaro.org>
ASoC: q6apm-lpass-dai: close graph on prepare errors
Srinivas Kandagatla <srinivas.kandagatla(a)linaro.org>
ASoC: qcom: q6apm-lpass-dai: close graphs before opening a new one
Hans de Goede <hansg(a)kernel.org>
net: rfkill: gpio: Fix crash due to dereferencering uninitialized pointer
Philipp Zabel <p.zabel(a)pengutronix.de>
net: rfkill: gpio: add DT support
Matthieu Baerts (NGI0) <matttbe(a)kernel.org>
selftests: mptcp: connect: catch IO errors on listen side
Matthieu Baerts (NGI0) <matttbe(a)kernel.org>
mptcp: propagate shutdown to subflows when possible
Mathias Nyman <mathias.nyman(a)linux.intel.com>
xhci: dbc: Fix full DbC transfer ring after several reconnects
Mathias Nyman <mathias.nyman(a)linux.intel.com>
xhci: dbc: decouple endpoint allocation from initialization
Johan Hovold <johan(a)kernel.org>
phy: ti: omap-usb2: fix device leak at unbind
Rob Herring <robh(a)kernel.org>
phy: Use device_get_match_data()
Krzysztof Kozlowski <krzysztof.kozlowski(a)linaro.org>
phy: broadcom: ns-usb3: fix Wvoid-pointer-to-enum-cast warning
Matthieu Baerts (NGI0) <matttbe(a)kernel.org>
selftests: mptcp: userspace pm: validate deny-join-id0 flag
Matthieu Baerts (NGI0) <matttbe(a)kernel.org>
mptcp: pm: nl: announce deny-join-id0 flag
Stefan Metzmacher <metze(a)samba.org>
smb: client: fix smbdirect_recv_io leak in smbd_negotiate() error path
Herbert Xu <herbert(a)gondor.apana.org.au>
crypto: af_alg - Set merge to zero early in af_alg_sendmsg
David Howells <dhowells(a)redhat.com>
crypto: af_alg: Indent the loop in af_alg_sendmsg()
Qi Xi <xiqi2(a)huawei.com>
drm: bridge: cdns-mhdp8546: Fix missing mutex unlock on error path
Loic Poulain <loic.poulain(a)oss.qualcomm.com>
drm: bridge: anx7625: Fix NULL pointer dereference with early IRQ
Colin Ian King <colin.i.king(a)gmail.com>
ASoC: SOF: Intel: hda-stream: Fix incorrect variable used in error message
Charles Keepax <ckeepax(a)opensource.cirrus.com>
ASoC: wm8974: Correct PLL rate rounding
Charles Keepax <ckeepax(a)opensource.cirrus.com>
ASoC: wm8940: Correct typo in control name
Jens Axboe <axboe(a)kernel.dk>
io_uring: include dying ring in task_work "should cancel" state
Jens Axboe <axboe(a)kernel.dk>
io_uring: backport io_should_terminate_tw()
Praful Adiga <praful.adiga(a)gmail.com>
ALSA: hda/realtek: Fix mute led for HP Laptop 15-dw4xx
Matthieu Baerts (NGI0) <matttbe(a)kernel.org>
selftests: mptcp: avoid spurious errors on TCP disconnect
Håkon Bugge <haakon.bugge(a)oracle.com>
rds: ib: Increment i_fastreg_wrs before bailing out
Maciej S. Szmigiero <maciej.szmigiero(a)oracle.com>
KVM: SVM: Sync TPR from LAPIC into VMCB::V_TPR even if AVIC is active
Thomas Fourier <fourier.thomas(a)gmail.com>
mmc: mvsdio: Fix dma_unmap_sg() nents value
Mohammad Rafi Shaik <mohammad.rafi.shaik(a)oss.qualcomm.com>
ASoC: qcom: q6apm-lpass-dais: Fix missing set_fmt DAI op for I2S
Mohammad Rafi Shaik <mohammad.rafi.shaik(a)oss.qualcomm.com>
ASoC: qcom: audioreach: Fix lpaif_type configuration for the I2S interface
Qu Wenruo <wqu(a)suse.com>
btrfs: tree-checker: fix the incorrect inode ref size check
Eugene Koira <eugkoira(a)amazon.com>
iommu/vt-d: Fix __domain_mapping()'s usage of switch_to_super_page()
Tao Cui <cuitao(a)kylinos.cn>
LoongArch: Check the return value when creating kobj
Huacai Chen <chenhuacai(a)kernel.org>
LoongArch: Align ACPI structures if ARCH_STRICT_ALIGN enabled
H. Nikolaus Schaller <hns(a)goldelico.com>
power: supply: bq27xxx: restrict no-battery detection to bq27000
H. Nikolaus Schaller <hns(a)goldelico.com>
power: supply: bq27xxx: fix error return in case of no bq27000 hdq battery
Nathan Chancellor <nathan(a)kernel.org>
nilfs2: fix CFI failure when accessing /sys/fs/nilfs2/features/*
Stefan Metzmacher <metze(a)samba.org>
ksmbd: smbdirect: verify remaining_data_length respects max_fragmented_recv_size
Namjae Jeon <linkinjeon(a)kernel.org>
ksmbd: smbdirect: validate data_offset and data_length field of smb_direct_data_transfer
Duoming Zhou <duoming(a)zju.edu.cn>
octeontx2-pf: Fix use-after-free bugs in otx2_sync_tstamp()
Duoming Zhou <duoming(a)zju.edu.cn>
cnic: Fix use-after-free bugs in cnic_delete_task
Alexey Nepomnyashih <sdl(a)nppct.ru>
net: liquidio: fix overflow in octeon_init_instr_queue()
Tariq Toukan <tariqt(a)nvidia.com>
Revert "net/mlx5e: Update and set Xon/Xoff upon port speed set"
Jakub Kicinski <kuba(a)kernel.org>
tls: make sure to abort the stream if headers are bogus
Kuniyuki Iwashima <kuniyu(a)google.com>
tcp: Clear tcp_sk(sk)->fastopen_rsk in tcp_disconnect().
Hangbin Liu <liuhangbin(a)gmail.com>
bonding: don't set oif to bond dev when getting NS target destination
Maciej Fijalkowski <maciej.fijalkowski(a)intel.com>
i40e: remove redundant memory barrier when cleaning Tx descs
Yeounsu Moon <yyyynoom(a)gmail.com>
net: natsemi: fix `rx_dropped` double accounting on `netif_rx()` failure
Matthieu Baerts (NGI0) <matttbe(a)kernel.org>
mptcp: set remote_deny_join_id0 on SYN recv
Jamie Bainbridge <jamie.bainbridge(a)gmail.com>
qed: Don't collect too many protection override GRC elements
Ioana Ciornei <ioana.ciornei(a)nxp.com>
dpaa2-switch: fix buffer pool seeding for control traffic
Miaoqian Lin <linmq006(a)gmail.com>
um: virtio_uml: Fix use-after-free after put_device in probe
Filipe Manana <fdmanana(a)suse.com>
btrfs: fix invalid extref key setup when replaying dentry
Chen Ridong <chenridong(a)huawei.com>
cgroup: split cgroup_destroy_wq into 3 workqueues
Geert Uytterhoeven <geert+renesas(a)glider.be>
pcmcia: omap_cf: Mark driver struct with __refdata to prevent section mismatch
Liao Yuanhong <liaoyuanhong(a)vivo.com>
wifi: mac80211: fix incorrect type for ret
Lachlan Hodges <lachlan.hodges(a)morsemicro.com>
wifi: mac80211: increase scan_ies_len for S1G
Takashi Sakamoto <o-takashi(a)sakamocchi.jp>
ALSA: firewire-motu: drop EPOLLOUT from poll return values as write is not supported
-------------
Diffstat:
Makefile | 4 +-
arch/loongarch/include/asm/acenv.h | 7 +-
arch/loongarch/kernel/env.c | 2 +
arch/um/drivers/virtio_uml.c | 6 +-
arch/x86/kvm/svm/svm.c | 3 +-
crypto/af_alg.c | 112 ++++++++-------------
drivers/gpu/drm/bridge/analogix/anx7625.c | 6 +-
.../gpu/drm/bridge/cadence/cdns-mhdp8546-core.c | 6 +-
drivers/iommu/intel/iommu.c | 7 +-
drivers/mmc/host/mvsdio.c | 2 +-
drivers/net/bonding/bond_main.c | 1 -
drivers/net/ethernet/broadcom/cnic.c | 3 +-
.../net/ethernet/cavium/liquidio/request_manager.c | 2 +-
.../net/ethernet/freescale/dpaa2/dpaa2-switch.c | 2 +-
drivers/net/ethernet/intel/i40e/i40e_txrx.c | 3 -
.../net/ethernet/marvell/octeontx2/nic/otx2_ptp.c | 2 +-
drivers/net/ethernet/mellanox/mlx5/core/en_main.c | 2 -
drivers/net/ethernet/natsemi/ns83820.c | 13 ++-
drivers/net/ethernet/qlogic/qed/qed_debug.c | 7 +-
drivers/pcmcia/omap_cf.c | 8 +-
drivers/phy/broadcom/phy-bcm-ns-usb3.c | 9 +-
drivers/phy/marvell/phy-berlin-usb.c | 7 +-
drivers/phy/ralink/phy-ralink-usb.c | 10 +-
drivers/phy/rockchip/phy-rockchip-pcie.c | 11 +-
drivers/phy/rockchip/phy-rockchip-usb.c | 10 +-
drivers/phy/ti/phy-omap-control.c | 9 +-
drivers/phy/ti/phy-omap-usb2.c | 24 +++--
drivers/phy/ti/phy-ti-pipe3.c | 14 +--
drivers/power/supply/bq27xxx_battery.c | 4 +-
drivers/usb/host/xhci-dbgcap.c | 94 ++++++++++++-----
fs/btrfs/tree-checker.c | 4 +-
fs/btrfs/tree-log.c | 2 +-
fs/nilfs2/sysfs.c | 4 +-
fs/nilfs2/sysfs.h | 8 +-
fs/smb/client/smbdirect.c | 4 +-
fs/smb/server/transport_rdma.c | 26 +++--
include/crypto/if_alg.h | 10 +-
include/uapi/linux/mptcp.h | 6 +-
io_uring/io_uring.c | 13 ++-
io_uring/io_uring.h | 13 +++
io_uring/poll.c | 3 +-
io_uring/timeout.c | 2 +-
kernel/cgroup/cgroup.c | 43 ++++++--
net/ipv4/tcp.c | 5 +
net/mac80211/driver-ops.h | 2 +-
net/mac80211/main.c | 7 +-
net/mptcp/pm_netlink.c | 7 ++
net/mptcp/protocol.c | 15 +++
net/mptcp/subflow.c | 4 +
net/rds/ib_frmr.c | 20 ++--
net/rfkill/rfkill-gpio.c | 22 +++-
net/tls/tls.h | 1 +
net/tls/tls_strp.c | 14 ++-
net/tls/tls_sw.c | 3 +-
sound/firewire/motu/motu-hwdep.c | 2 +-
sound/pci/hda/patch_realtek.c | 1 +
sound/soc/codecs/wm8940.c | 2 +-
sound/soc/codecs/wm8974.c | 8 +-
sound/soc/qcom/qdsp6/audioreach.c | 1 +
sound/soc/qcom/qdsp6/q6apm-lpass-dais.c | 36 +++++--
sound/soc/sof/intel/hda-stream.c | 2 +-
tools/testing/selftests/net/mptcp/mptcp_connect.c | 11 +-
tools/testing/selftests/net/mptcp/pm_nl_ctl.c | 7 ++
tools/testing/selftests/net/mptcp/userspace_pm.sh | 14 ++-
64 files changed, 440 insertions(+), 272 deletions(-)
From: Hugo Villeneuve <hvilleneuve(a)dimonoff.com>
Commit 43c51bb573aa ("sc16is7xx: make sure device is in suspend once
probed") permanently enabled access to the enhanced features in
sc16is7xx_probe(), and it is never disabled after that.
Therefore, remove useless re-enable of enhanced features in
sc16is7xx_set_baud().
Fixes: 43c51bb573aa ("sc16is7xx: make sure device is in suspend once probed")
Cc: stable(a)vger.kernel.org
Signed-off-by: Hugo Villeneuve <hvilleneuve(a)dimonoff.com>
---
drivers/tty/serial/sc16is7xx.c | 7 -------
1 file changed, 7 deletions(-)
diff --git a/drivers/tty/serial/sc16is7xx.c b/drivers/tty/serial/sc16is7xx.c
index 1a2c4c14f6aac..c7435595dce13 100644
--- a/drivers/tty/serial/sc16is7xx.c
+++ b/drivers/tty/serial/sc16is7xx.c
@@ -588,13 +588,6 @@ static int sc16is7xx_set_baud(struct uart_port *port, int baud)
div /= prescaler;
}
- /* Enable enhanced features */
- sc16is7xx_efr_lock(port);
- sc16is7xx_port_update(port, SC16IS7XX_EFR_REG,
- SC16IS7XX_EFR_ENABLE_BIT,
- SC16IS7XX_EFR_ENABLE_BIT);
- sc16is7xx_efr_unlock(port);
-
/* If bit MCR_CLKSEL is set, the divide by 4 prescaler is activated. */
sc16is7xx_port_update(port, SC16IS7XX_MCR_REG,
SC16IS7XX_MCR_CLKSEL_BIT,
--
2.39.5
Hello,
This series is based on commit
320475fbd590 Merge tag 'mtd/fixes-for-6.17-rc6' of git://git.kernel.org/pub/scm/linux/kernel/git/mtd/linux
of Mainline Linux.
The first patch in the series has been posted as a Fix in contrast to
its predecessor at:
https://lore.kernel.org/r/20250903124505.365913-10-s-vadapalli@ti.com/
based on the feedback provided by Jiri Slaby <jirislaby(a)kernel.org> at:
https://lore.kernel.org/r/3d3a4b52-e343-42f3-9d69-94c259812143@kernel.org/
Since the Fix is independent of enabling loadable module support for the
pci-keystone.c driver, it is being posted as a new patch.
Checking out at the commit of Mainline Linux which this series is based
on, I noticed an exception triggered by the pci-keystone.c driver during
its probe. Although this is not a fatal exception and Linux continues to
boot, the driver is non-functional. I root-caused the exception to
free_initmem() freeing the memory associated with the ks_pcie_host_init()
function in the driver before the driver's probe was invoked. This
appears to be a race condition but it is easily reproducible with the
Linux .config that I have used. The fix therefore is to remove the
__init macro which is implemented by the second patch in the series.
For reference, the logs for the case where Linux is built by checking
out at the base commit of Mainline Linux are:
https://gist.github.com/Siddharth-Vadapalli-at-TI/f4891b707921c53dfb464ad2f…
and the logs clearly prove that the print associated with free_initmem()
which is:
[ 2.446834] Freeing unused kernel memory: 4864K
is displayed prior to the prints associated with the pci-keystone.c
driver being probed which is:
[ 7.707103] keystone-pcie 5500000.pcie: host bridge /bus@100000/pcie@5500000 ranges:
Building Linux by applying both patches in the series on the base commit of
Mainline Linux, the driver probes successfully without any exceptions or
errors. This was tested on AM654-EVM with an NVMe SSD connected to the
PCIe Connector on the board. The NVMe SSD enumerates successfully.
Additionally, the 'hdparm' utility was used to read from the SSD
confirming that the SSD is functional. The logs corresponding to this are:
https://gist.github.com/Siddharth-Vadapalli-at-TI/1b09a12a53db4233e82c5bcfc…
Regards,
Siddharth.
Siddharth Vadapalli (2):
PCI: keystone: Use devm_request_irq() to free "ks-pcie-error-irq" on
exit
PCI: keystone: Remove the __init macro for the ks_pcie_host_init()
callback
drivers/pci/controller/dwc/pci-keystone.c | 8 ++++----
1 file changed, 4 insertions(+), 4 deletions(-)
--
2.43.0
In i2c_amd_probe(), amd_mp2_find_device() utilizes
driver_find_next_device() which internally calls driver_find_device()
to locate the matching device. driver_find_device() increments the
reference count of the found device by calling get_device(), but
amd_mp2_find_device() fails to call put_device() to decrement the
reference count before returning. This results in a reference count
leak of the PCI device each time i2c_amd_probe() is executed, which
may prevent the device from being properly released and cause a memory
leak.
Found by code review.
Cc: stable(a)vger.kernel.org
Fixes: 529766e0a011 ("i2c: Add drivers for the AMD PCIe MP2 I2C controller")
Signed-off-by: Ma Ke <make24(a)iscas.ac.cn>
---
Changes in v2:
- modified the missing initialization in the patch. Sorry for the omission.
---
drivers/i2c/busses/i2c-amd-mp2-pci.c | 5 ++++-
1 file changed, 4 insertions(+), 1 deletion(-)
diff --git a/drivers/i2c/busses/i2c-amd-mp2-pci.c b/drivers/i2c/busses/i2c-amd-mp2-pci.c
index ef7370d3dbea..60edbabc2986 100644
--- a/drivers/i2c/busses/i2c-amd-mp2-pci.c
+++ b/drivers/i2c/busses/i2c-amd-mp2-pci.c
@@ -458,13 +458,16 @@ struct amd_mp2_dev *amd_mp2_find_device(void)
{
struct device *dev;
struct pci_dev *pci_dev;
+ struct amd_mp2_dev *mp2_dev;
dev = driver_find_next_device(&amd_mp2_pci_driver.driver, NULL);
if (!dev)
return NULL;
pci_dev = to_pci_dev(dev);
- return (struct amd_mp2_dev *)pci_get_drvdata(pci_dev);
+ mp2_dev = (struct amd_mp2_dev *)pci_get_drvdata(pci_dev);
+ put_device(dev);
+ return mp2_dev;
}
EXPORT_SYMBOL_GPL(amd_mp2_find_device);
--
2.17.1
There is no page fault without MMU. Compiling the rtapp/pagefault monitor
without CONFIG_MMU fails as page fault tracepoints' definitions are not
available.
Make rtapp/pagefault monitor depends on CONFIG_MMU.
Fixes: 9162620eb604 ("rv: Add rtapp_pagefault monitor")
Signed-off-by: Nam Cao <namcao(a)linutronix.de>
Reported-by: kernel test robot <lkp(a)intel.com>
Closes: https://lore.kernel.org/oe-kbuild-all/202509260455.6Z9Vkty4-lkp@intel.com/
Cc: stable(a)vger.kernel.org
---
kernel/trace/rv/monitors/pagefault/Kconfig | 1 +
1 file changed, 1 insertion(+)
diff --git a/kernel/trace/rv/monitors/pagefault/Kconfig b/kernel/trace/rv/monitors/pagefault/Kconfig
index 5e16625f1653..0e013f00c33b 100644
--- a/kernel/trace/rv/monitors/pagefault/Kconfig
+++ b/kernel/trace/rv/monitors/pagefault/Kconfig
@@ -5,6 +5,7 @@ config RV_MON_PAGEFAULT
select RV_LTL_MONITOR
depends on RV_MON_RTAPP
depends on X86 || RISCV
+ depends on MMU
default y
select LTL_MON_EVENTS_ID
bool "pagefault monitor"
--
2.51.0
Loading a large (~2.1G) files with kexec crashes the host with when
running:
# kexec --load kernel --initrd initrd_with_2G_or_more
UBSAN: signed-integer-overflow in ./include/crypto/sha256_base.h:64:19
34152083 * 64 cannot be represented in type 'int'
...
BUG: unable to handle page fault for address: ff9fffff83b624c0
sha256_update (lib/crypto/sha256.c:137)
crypto_sha256_update (crypto/sha256_generic.c:40)
kexec_calculate_store_digests (kernel/kexec_file.c:769)
__se_sys_kexec_file_load (kernel/kexec_file.c:397 kernel/kexec_file.c:332)
...
(Line numbers based on commit da274362a7bd9 ("Linux 6.12.49")
This is not happening upstream (v6.16+), given that `block` type was
upgraded from "int" to "size_t" in commit 74a43a2cf5e8 ("crypto:
lib/sha256 - Move partial block handling out")
Upgrade the block type similar to the commit above, avoiding hitting the
overflow.
This patch is only suitable for the stable tree, and before 6.16, which
got commit 74a43a2cf5e8 ("crypto: lib/sha256 - Move partial block
handling out")
Signed-off-by: Breno Leitao <leitao(a)debian.org>
Fixes: 11b8d5ef9138 ("crypto: sha256 - implement base layer for SHA-256") # not after v6.16
Reported-by: Michael van der Westhuizen <rmikey(a)meta.com>
Reported-by: Tobias Fleig <tfleig(a)meta.com>
---
include/crypto/sha256_base.h | 2 +-
1 file changed, 1 insertion(+), 1 deletion(-)
diff --git a/include/crypto/sha256_base.h b/include/crypto/sha256_base.h
index e0418818d63c8..fa63af10102b2 100644
--- a/include/crypto/sha256_base.h
+++ b/include/crypto/sha256_base.h
@@ -44,7 +44,7 @@ static inline int lib_sha256_base_do_update(struct sha256_state *sctx,
sctx->count += len;
if (unlikely((partial + len) >= SHA256_BLOCK_SIZE)) {
- int blocks;
+ size_t blocks;
if (partial) {
int p = SHA256_BLOCK_SIZE - partial;
---
base-commit: da274362a7bd9ab3a6e46d15945029145ebce672
change-id: 20251001-stable_crash-f2151baf043b
Best regards,
--
Breno Leitao <leitao(a)debian.org>
Hi Stable,
Please provide a quote for your products:
Include:
1.Pricing (per unit)
2.Delivery cost & timeline
3.Quote expiry date
Deadline: September
Thanks!
Kamal Prasad
Albinayah Trading
The patch titled
Subject: mm/ksm: fix flag-dropping behavior in ksm_madvise
has been added to the -mm mm-hotfixes-unstable branch. Its filename is
mm-ksm-fix-flag-dropping-behavior-in-ksm_madvise.patch
This patch will shortly appear at
https://git.kernel.org/pub/scm/linux/kernel/git/akpm/25-new.git/tree/patche…
This patch will later appear in the mm-hotfixes-unstable branch at
git://git.kernel.org/pub/scm/linux/kernel/git/akpm/mm
Before you just go and hit "reply", please:
a) Consider who else should be cc'ed
b) Prefer to cc a suitable mailing list as well
c) Ideally: find the original patch on the mailing list and do a
reply-to-all to that, adding suitable additional cc's
*** Remember to use Documentation/process/submit-checklist.rst when testing your code ***
The -mm tree is included into linux-next via the mm-everything
branch at git://git.kernel.org/pub/scm/linux/kernel/git/akpm/mm
and is updated there every 2-3 working days
------------------------------------------------------
From: Jakub Acs <acsjakub(a)amazon.de>
Subject: mm/ksm: fix flag-dropping behavior in ksm_madvise
Date: Wed, 1 Oct 2025 09:03:52 +0000
syzkaller discovered the following crash: (kernel BUG)
[ 44.607039] ------------[ cut here ]------------
[ 44.607422] kernel BUG at mm/userfaultfd.c:2067!
[ 44.608148] Oops: invalid opcode: 0000 [#1] SMP DEBUG_PAGEALLOC KASAN NOPTI
[ 44.608814] CPU: 1 UID: 0 PID: 2475 Comm: reproducer Not tainted 6.16.0-rc6 #1 PREEMPT(none)
[ 44.609635] Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS rel-1.16.3-0-ga6ed6b701f0a-prebuilt.qemu.org 04/01/2014
[ 44.610695] RIP: 0010:userfaultfd_release_all+0x3a8/0x460
<snip other registers, drop unreliable trace>
[ 44.617726] Call Trace:
[ 44.617926] <TASK>
[ 44.619284] userfaultfd_release+0xef/0x1b0
[ 44.620976] __fput+0x3f9/0xb60
[ 44.621240] fput_close_sync+0x110/0x210
[ 44.622222] __x64_sys_close+0x8f/0x120
[ 44.622530] do_syscall_64+0x5b/0x2f0
[ 44.622840] entry_SYSCALL_64_after_hwframe+0x76/0x7e
[ 44.623244] RIP: 0033:0x7f365bb3f227
Kernel panics because it detects UFFD inconsistency during
userfaultfd_release_all(). Specifically, a VMA which has a valid pointer
to vma->vm_userfaultfd_ctx, but no UFFD flags in vma->vm_flags.
The inconsistency is caused in ksm_madvise(): when user calls madvise()
with MADV_UNMEARGEABLE on a VMA that is registered for UFFD in MINOR mode,
it accidentally clears all flags stored in the upper 32 bits of
vma->vm_flags.
Assuming x86_64 kernel build, unsigned long is 64-bit and unsigned int and
int are 32-bit wide. This setup causes the following mishap during the &=
~VM_MERGEABLE assignment.
VM_MERGEABLE is a 32-bit constant of type unsigned int, 0x8000'0000.
After ~ is applied, it becomes 0x7fff'ffff unsigned int, which is then
promoted to unsigned long before the & operation. This promotion fills
upper 32 bits with leading 0s, as we're doing unsigned conversion (and
even for a signed conversion, this wouldn't help as the leading bit is 0).
& operation thus ends up AND-ing vm_flags with 0x0000'0000'7fff'ffff
instead of intended 0xffff'ffff'7fff'ffff and hence accidentally clears
the upper 32-bits of its value.
Fix it by changing `VM_MERGEABLE` constant to unsigned long, using the
BIT() macro.
Note: other VM_* flags are not affected: This only happens to the
VM_MERGEABLE flag, as the other VM_* flags are all constants of type int
and after ~ operation, they end up with leading 1 and are thus converted
to unsigned long with leading 1s.
Note 2:
After commit 31defc3b01d9 ("userfaultfd: remove (VM_)BUG_ON()s"), this is
no longer a kernel BUG, but a WARNING at the same place:
[ 45.595973] WARNING: CPU: 1 PID: 2474 at mm/userfaultfd.c:2067
but the root-cause (flag-drop) remains the same.
Link: https://lkml.kernel.org/r/20251001090353.57523-2-acsjakub@amazon.de
Fixes: 7677f7fd8be7 ("userfaultfd: add minor fault registration mode")
Signed-off-by: Jakub Acs <acsjakub(a)amazon.de>
Acked-by: David Hildenbrand <david(a)redhat.com>
Acked-by: SeongJae Park <sj(a)kernel.org>
Cc: Xu Xin <xu.xin16(a)zte.com.cn>
Cc: Chengming Zhou <chengming.zhou(a)linux.dev>
Cc: Peter Xu <peterx(a)redhat.com>
Cc: Axel Rasmussen <axelrasmussen(a)google.com>
Cc: <stable(a)vger.kernel.org>
Signed-off-by: Andrew Morton <akpm(a)linux-foundation.org>
---
include/linux/mm.h | 2 +-
1 file changed, 1 insertion(+), 1 deletion(-)
--- a/include/linux/mm.h~mm-ksm-fix-flag-dropping-behavior-in-ksm_madvise
+++ a/include/linux/mm.h
@@ -296,7 +296,7 @@ extern unsigned int kobjsize(const void
#define VM_MIXEDMAP 0x10000000 /* Can contain "struct page" and pure PFN pages */
#define VM_HUGEPAGE 0x20000000 /* MADV_HUGEPAGE marked this vma */
#define VM_NOHUGEPAGE 0x40000000 /* MADV_NOHUGEPAGE marked this vma */
-#define VM_MERGEABLE 0x80000000 /* KSM may merge identical pages */
+#define VM_MERGEABLE BIT(31) /* KSM may merge identical pages */
#ifdef CONFIG_ARCH_USES_HIGH_VMA_FLAGS
#define VM_HIGH_ARCH_BIT_0 32 /* bit only usable on 64-bit architectures */
_
Patches currently in -mm which might be from acsjakub(a)amazon.de are
mm-ksm-fix-flag-dropping-behavior-in-ksm_madvise.patch
The core scheduling is for smt enabled cpus. It is not returns
failure and gives plenty of error messages and not clearly points
to the smt issue if the smt is disabled. It just mention
"not a core sched system" and many other messages. For example:
Not a core sched system
tid=210574, / tgid=210574 / pgid=210574: ffffffffffffffff
Not a core sched system
tid=210575, / tgid=210575 / pgid=210574: ffffffffffffffff
Not a core sched system
tid=210577, / tgid=210575 / pgid=210574: ffffffffffffffff
(similar things many other times)
In this patch, the test will first read /sys/devices/system/cpu/smt/active,
if the file cannot be opened or its value is 0, the test is skipped with
an explanatory message. This helps developers understand why it is skipped
and avoids unnecessary attention when running the full selftest suite.
Signed-off-by: Yifei Liu <yifei.l.liu(a)oracle.com>
---
tools/testing/selftests/sched/cs_prctl_test.c | 23 ++++++++++++++++++-
1 file changed, 22 insertions(+), 1 deletion(-)
diff --git a/tools/testing/selftests/sched/cs_prctl_test.c b/tools/testing/selftests/sched/cs_prctl_test.c
index 52d97fae4dbd..7ce8088cde6a 100644
--- a/tools/testing/selftests/sched/cs_prctl_test.c
+++ b/tools/testing/selftests/sched/cs_prctl_test.c
@@ -32,6 +32,8 @@
#include <stdlib.h>
#include <string.h>
+#include "../kselftest.h"
+
#if __GLIBC_PREREQ(2, 30) == 0
#include <sys/syscall.h>
static pid_t gettid(void)
@@ -109,6 +111,22 @@ static void handle_usage(int rc, char *msg)
exit(rc);
}
+int check_smt(void)
+{
+ int c = 0;
+ FILE *file;
+
+ file = fopen("/sys/devices/system/cpu/smt/active", "r");
+ if (!file)
+ return 0;
+ c = fgetc(file) - 0x30;
+ fclose(file);
+ if (c == 0 || c == 1)
+ return c;
+ //if fgetc returns EOF or -1 for correupted files, return 0.
+ return 0;
+}
+
static unsigned long get_cs_cookie(int pid)
{
unsigned long long cookie;
@@ -271,7 +289,10 @@ int main(int argc, char *argv[])
delay = -1;
srand(time(NULL));
-
+ if (!check_smt()) {
+ ksft_test_result_skip("smt not enabled\n");
+ return 1;
+ }
/* put into separate process group */
if (setpgid(0, 0) != 0)
handle_error("process group");
--
2.50.1
Greetings:
Sending via plain text email -- apologies if you receive this twice.
If this isn't the process for reporting a regression in a LTS kernel per https://www.kernel.org/doc/html/latest/admin-guide/reporting-issues.html, I'm happy to follow another process.
Kernel 6.1.149 introduced a regression, at least on our ARM Cortex A57-based platforms, via commit 8f4dc4e54eed4bebb18390305eb1f721c00457e1 in arch/arm64/kernel/fpsimd.c where booting KVM VMs eventually leads to a spinlock recursion BUG and crash of the box.
Reverting that commit via the below reverts to the old (working) behavior:
diff --git a/arch/arm64/kernel/fpsimd.c b/arch/arm64/kernel/fpsimd.c
index 837d1937300a57..bc42163a7fd1f0 100644
--- a/arch/arm64/kernel/fpsimd.c
+++ b/arch/arm64/kernel/fpsimd.c
@@ -1851,10 +1851,10 @@ void fpsimd_save_and_flush_cpu_state(void)
if (!system_supports_fpsimd())
return;
WARN_ON(preemptible());
- get_cpu_fpsimd_context();
+ __get_cpu_fpsimd_context();
fpsimd_save();
fpsimd_flush_cpu_state();
- put_cpu_fpsimd_context();
+ __put_cpu_fpsimd_context();
}
#ifdef CONFIG_KERNEL_MODE_NEON
It's not entirely clear to me if this is specific to our firmware, specific to ARM Cortex A57, or more systemic as we lack sufficiently differentiated hardware to know. I've tested on the latest 6.1 kernel in addition to the one in the log below and have also tested a number of firmware versions available for these boxes.
Steps to reproduce:
Boot VM in qemu-system-aarch64 with "-accel kvm" and "-cpu host" flags set -- no other arguments seem to matter
Generate CPU load in VM
Kernel log:
[sjc1] root@si-compute-kvm-e0fff70016b4:/# [ 805.905413] BUG: spinlock recursion on CPU#7, CPU 3/KVM/57616
[ 805.905452] lock: 0xffff3045ef850240, .magic: dead4ead, .owner: CPU 3/KVM/57616, .owner_cpu: 7
[ 805.905477] CPU: 7 PID: 57616 Comm: CPU 3/KVM Tainted: G O 6.1.152 #1
[ 805.905495] Hardware name: SoftIron SoftIron Platform Mainboard/SoftIron Platform Mainboard, BIOS 1.31 May 11 2023
[ 805.905516] Call trace:
[ 805.905524] dump_backtrace+0xe4/0x110
[ 805.905538] show_stack+0x20/0x30
[ 805.905548] dump_stack_lvl+0x6c/0x88
[ 805.905561] dump_stack+0x18/0x34
[ 805.905571] spin_dump+0x98/0xac
[ 805.905583] do_raw_spin_lock+0x70/0x128
[ 805.905596] _raw_spin_lock+0x18/0x28
[ 805.905607] raw_spin_rq_lock_nested+0x18/0x28
[ 805.905620] update_blocked_averages+0x70/0x550
[ 805.905634] run_rebalance_domains+0x50/0x70
[ 805.905645] handle_softirqs+0x198/0x328
[ 805.905659] __do_softirq+0x1c/0x28
[ 805.905669] ____do_softirq+0x18/0x28
[ 805.905680] call_on_irq_stack+0x30/0x48
[ 805.905691] do_softirq_own_stack+0x24/0x30
[ 805.905703] do_softirq+0x74/0x90
[ 805.905714] __local_bh_enable_ip+0x64/0x80
[ 805.905727] fpsimd_save_and_flush_cpu_state+0x5c/0x68
[ 805.905740] kvm_arch_vcpu_put_fp+0x4c/0x88
[ 805.905752] kvm_arch_vcpu_put+0x28/0x88
[ 805.905764] kvm_sched_out+0x38/0x58
[ 805.905774] __schedule+0x55c/0x6c8
[ 805.905786] schedule+0x60/0xa8
[ 805.905796] kvm_vcpu_block+0x5c/0x90
[ 805.905807] kvm_vcpu_halt+0x440/0x468
[ 805.905818] kvm_vcpu_wfi+0x3c/0x70
[ 805.905828] kvm_handle_wfx+0x18c/0x1f0
[ 805.905840] handle_exit+0xb8/0x148
[ 805.905851] kvm_arch_vcpu_ioctl_run+0x6c4/0x7b0
[ 805.905863] kvm_vcpu_ioctl+0x1d0/0x8b8
[ 805.905874] __arm64_sys_ioctl+0x9c/0xe0
[ 805.905886] invoke_syscall+0x78/0x108
[ 805.905899] el0_svc_common.constprop.3+0xb4/0xf8
[ 805.905912] do_el0_svc+0x78/0x88
[ 805.905922] el0_svc+0x48/0x78
[ 805.905932] el0t_64_sync_handler+0x40/0xc0
[ 805.905943] el0t_64_sync+0x18c/0x190
[ 806.048300] hrtimer: interrupt took 2976 ns
[ 826.924613] rcu: INFO: rcu_sched detected stalls on CPUs/tasks:
SoC 0 became not ready
SoC 0 became ready
Thanks,
--
Kenneth Van Alstyne, Jr.
This is the start of the stable review cycle for the 6.6.109 release.
There are 91 patches in this series, all will be posted as a response
to this one. If anyone has any issues with these being applied, please
let me know.
Responses should be made by Thu, 02 Oct 2025 14:37:59 +0000.
Anything received after that time might be too late.
The whole patch series can be found in one patch at:
https://www.kernel.org/pub/linux/kernel/v6.x/stable-review/patch-6.6.109-rc…
or in the git tree and branch at:
git://git.kernel.org/pub/scm/linux/kernel/git/stable/linux-stable-rc.git linux-6.6.y
and the diffstat can be found below.
thanks,
greg k-h
-------------
Pseudo-Shortlog of commits:
Greg Kroah-Hartman <gregkh(a)linuxfoundation.org>
Linux 6.6.109-rc1
David Laight <David.Laight(a)ACULAB.COM>
minmax.h: remove some #defines that are only expanded once
David Laight <David.Laight(a)ACULAB.COM>
minmax.h: simplify the variants of clamp()
David Laight <David.Laight(a)ACULAB.COM>
minmax.h: move all the clamp() definitions after the min/max() ones
David Laight <David.Laight(a)ACULAB.COM>
minmax.h: use BUILD_BUG_ON_MSG() for the lo < hi test in clamp()
David Laight <David.Laight(a)ACULAB.COM>
minmax.h: reduce the #define expansion of min(), max() and clamp()
David Laight <David.Laight(a)ACULAB.COM>
minmax.h: update some comments
David Laight <David.Laight(a)ACULAB.COM>
minmax.h: add whitespace around operators and after commas
Linus Torvalds <torvalds(a)linux-foundation.org>
minmax: fix up min3() and max3() too
Linus Torvalds <torvalds(a)linux-foundation.org>
minmax: improve macro expansion and type checking
Linus Torvalds <torvalds(a)linux-foundation.org>
minmax: don't use max() in situations that want a C constant expression
Linus Torvalds <torvalds(a)linux-foundation.org>
minmax: simplify min()/max()/clamp() implementation
Linus Torvalds <torvalds(a)linux-foundation.org>
minmax: make generic MIN() and MAX() macros available everywhere
Lukasz Czapnik <lukasz.czapnik(a)intel.com>
i40e: add validation for ring_len param
Justin Bronder <jsbronder(a)cold-front.org>
i40e: increase max descriptors for XL710
Nirmoy Das <nirmoyd(a)nvidia.com>
drm/ast: Use msleep instead of mdelay for edid read
Hans de Goede <hansg(a)kernel.org>
gpiolib: Extend software-node support to support secondary software-nodes
Jan Kara <jack(a)suse.cz>
loop: Avoid updating block size under exclusive owner
David Hildenbrand <david(a)redhat.com>
mm/migrate_device: don't add folio to be freed to LRU in migrate_device_finalize()
Kefeng Wang <wangkefeng.wang(a)huawei.com>
mm: migrate_device: use more folio in migrate_device_finalize()
Florian Fainelli <florian.fainelli(a)broadcom.com>
ARM: bcm: Select ARM_GIC_V3 for ARCH_BRCMSTB
Nathan Chancellor <nathan(a)kernel.org>
s390/cpum_cf: Fix uninitialized warning after backport of ce971233242b
Thomas Zimmermann <tzimmermann(a)suse.de>
fbcon: Fix OOB access in font allocation
Samasth Norway Ananda <samasth.norway.ananda(a)oracle.com>
fbcon: fix integer overflow in fbcon_do_set_font
Jinjiang Tu <tujinjiang(a)huawei.com>
mm/hugetlb: fix folio is still mapped when deleted
Eric Biggers <ebiggers(a)kernel.org>
kmsan: fix out-of-bounds access to shadow memory
Zhen Ni <zhen.ni(a)easystack.cn>
afs: Fix potential null pointer dereference in afs_put_server
Nobuhiro Iwamatsu <iwamatsu(a)nigauri.org>
ARM: dts: socfpga: sodia: Fix mdio bus probe and PHY address
Masami Hiramatsu (Google) <mhiramat(a)kernel.org>
tracing: dynevent: Add a missing lockdown check on dynevent
Eric Biggers <ebiggers(a)kernel.org>
crypto: af_alg - Fix incorrect boolean values in af_alg_ctx
Lukasz Czapnik <lukasz.czapnik(a)intel.com>
i40e: improve VF MAC filters accounting
Lukasz Czapnik <lukasz.czapnik(a)intel.com>
i40e: add mask to apply valid bits for itr_idx
Lukasz Czapnik <lukasz.czapnik(a)intel.com>
i40e: add max boundary check for VF filters
Lukasz Czapnik <lukasz.czapnik(a)intel.com>
i40e: fix validation of VF state in get resources
Lukasz Czapnik <lukasz.czapnik(a)intel.com>
i40e: fix input validation logic for action_meta
Lukasz Czapnik <lukasz.czapnik(a)intel.com>
i40e: fix idx validation in config queues msg
Lukasz Czapnik <lukasz.czapnik(a)intel.com>
i40e: fix idx validation in i40e_validate_queue_map
Amit Chaudhari <amitchaudhari(a)mac.com>
HID: asus: add support for missing PX series fn keys
Sang-Heon Jeon <ekffu200098(a)gmail.com>
smb: client: fix wrong index reference in smb2_compound_op()
Sebastian Andrzej Siewior <bigeasy(a)linutronix.de>
futex: Prevent use-after-free during requeue-PI
Zabelin Nikita <n.zabelin(a)mt-integration.ru>
drm/gma500: Fix null dereference in hdmi teardown
Dan Carpenter <dan.carpenter(a)linaro.org>
octeontx2-pf: Fix potential use after free in otx2_tc_add_flow()
Vladimir Oltean <vladimir.oltean(a)nxp.com>
net: dsa: lantiq_gswip: suppress -EINVAL errors for bridge FDB entries added to the CPU port
Vladimir Oltean <vladimir.oltean(a)nxp.com>
net: dsa: lantiq_gswip: move gswip_add_single_port_br() call to port_setup()
Martin Schiller <ms(a)dev.tdt.de>
net: dsa: lantiq_gswip: do also enable or disable cpu port
Ido Schimmel <idosch(a)nvidia.com>
selftests: fib_nexthops: Fix creation of non-FDB nexthops
Ido Schimmel <idosch(a)nvidia.com>
nexthop: Forbid FDB status change while nexthop is in a group
Jason Baron <jbaron(a)akamai.com>
net: allow alloc_skb_with_frags() to use MAX_SKB_FRAGS
Alok Tiwari <alok.a.tiwari(a)oracle.com>
bnxt_en: correct offset handling for IPv6 destination address
Sebastian Andrzej Siewior <bigeasy(a)linutronix.de>
vhost: Take a reference on the task in struct vhost_task.
Luiz Augusto von Dentz <luiz.von.dentz(a)intel.com>
Bluetooth: hci_event: Fix UAF in hci_acl_create_conn_sync
Luiz Augusto von Dentz <luiz.von.dentz(a)intel.com>
Bluetooth: hci_sync: Fix hci_resume_advertising_sync
Petr Malat <oss(a)malat.biz>
ethernet: rvu-af: Remove slash from the driver name
Stéphane Grosjean <stephane.grosjean(a)hms-networks.com>
can: peak_usb: fix shift-out-of-bounds issue
Vincent Mailhol <mailhol(a)kernel.org>
can: mcba_usb: populate ndo_change_mtu() to prevent buffer overflow
Vincent Mailhol <mailhol(a)kernel.org>
can: sun4i_can: populate ndo_change_mtu() to prevent buffer overflow
Vincent Mailhol <mailhol(a)kernel.org>
can: hi311x: populate ndo_change_mtu() to prevent buffer overflow
Vincent Mailhol <mailhol(a)kernel.org>
can: etas_es58x: populate ndo_change_mtu() to prevent buffer overflow
Sabrina Dubroca <sd(a)queasysnail.net>
xfrm: xfrm_alloc_spi shouldn't use 0 as SPI
Leon Hwang <leon.hwang(a)linux.dev>
bpf: Reject bpf_timer for PREEMPT_RT
Geert Uytterhoeven <geert+renesas(a)glider.be>
can: rcar_can: rcar_can_resume(): fix s2ram with PSCI
James Guan <guan_yufei(a)163.com>
wifi: virt_wifi: Fix page fault on connect
Stefan Metzmacher <metze(a)samba.org>
smb: server: don't use delayed_work for post_recv_credits_work
Christian Loehle <christian.loehle(a)arm.com>
cpufreq: Initialize cpufreq-based invariance before subsys
Jihed Chaibi <jihed.chaibi.dev(a)gmail.com>
ARM: dts: kirkwood: Fix sound DAI cells for OpenRD clients
Peng Fan <peng.fan(a)nxp.com>
arm64: dts: imx8mp: Correct thermal sensor index
Hugh Dickins <hughd(a)google.com>
mm: folio_may_be_lru_cached() unless folio_test_large()
Hugh Dickins <hughd(a)google.com>
mm/gup: local lru_add_drain() to avoid lru_add_drain_all()
Hugh Dickins <hughd(a)google.com>
mm/gup: check ref_count instead of lru before migration
Shivank Garg <shivankg(a)amd.com>
mm: add folio_expected_ref_count() for reference count calculation
David Hildenbrand <david(a)redhat.com>
mm/gup: revert "mm: gup: fix infinite loop within __get_longterm_locked"
Or Har-Toov <ohartoov(a)nvidia.com>
IB/mlx5: Fix obj_type mismatch for SRQ event subscriptions
qaqland <anguoli(a)uniontech.com>
ALSA: usb-audio: Add mute TLV for playback volumes on more devices
Cryolitia PukNgae <cryolitia(a)uniontech.com>
ALSA: usb-audio: move mixer_quirks' min_mute into common quirk
noble.yang <noble.yang(a)comtrue-inc.com>
ALSA: usb-audio: Add DSD support for Comtrue USB Audio device
Heikki Krogerus <heikki.krogerus(a)linux.intel.com>
i2c: designware: Add quirk for Intel Xe
Benoît Monin <benoit.monin(a)bootlin.com>
mmc: sdhci-cadence: add Mobileye eyeQ support
Jiayi Li <lijiayi(a)kylinos.cn>
usb: core: Add 0x prefix to quirks debug output
Takashi Iwai <tiwai(a)suse.de>
ALSA: usb-audio: Fix build with CONFIG_INPUT=n
Chen Ni <nichen(a)iscas.ac.cn>
ALSA: usb-audio: Convert comma to semicolon
Kerem Karabay <kekrby(a)gmail.com>
HID: multitouch: specify that Apple Touch Bar is direct
Kerem Karabay <kekrby(a)gmail.com>
HID: multitouch: take cls->maxcontacts into account for Apple Touch Bar even without a HID_DG_CONTACTMAX field
Kerem Karabay <kekrby(a)gmail.com>
HID: multitouch: support getting the tip state from HID_DG_TOUCH fields in Apple Touch Bar
Kerem Karabay <kekrby(a)gmail.com>
HID: multitouch: Get the contact ID from HID_DG_TRANSDUCER_INDEX fields in case of Apple Touch Bar
Cristian Ciocaltea <cristian.ciocaltea(a)collabora.com>
ALSA: usb-audio: Add mixer quirk for Sony DualSense PS5
Cristian Ciocaltea <cristian.ciocaltea(a)collabora.com>
ALSA: usb-audio: Remove unneeded wmb() in mixer_quirks
Cristian Ciocaltea <cristian.ciocaltea(a)collabora.com>
ALSA: usb-audio: Simplify NULL comparison in mixer_quirks
Cristian Ciocaltea <cristian.ciocaltea(a)collabora.com>
ALSA: usb-audio: Avoid multiple assignments in mixer_quirks
Cristian Ciocaltea <cristian.ciocaltea(a)collabora.com>
ALSA: usb-audio: Drop unnecessary parentheses in mixer_quirks
Cristian Ciocaltea <cristian.ciocaltea(a)collabora.com>
ALSA: usb-audio: Fix block comments in mixer_quirks
Takashi Sakamoto <o-takashi(a)sakamocchi.jp>
firewire: core: fix overlooked update of subsystem ABI version
Alok Tiwari <alok.a.tiwari(a)oracle.com>
scsi: ufs: mcq: Fix memory allocation checks for SQE and CQE
-------------
Diffstat:
Makefile | 4 +-
.../dts/intel/socfpga/socfpga_cyclone5_sodia.dts | 6 +-
.../boot/dts/marvell/kirkwood-openrd-client.dts | 2 +-
arch/arm/mach-bcm/Kconfig | 1 +
arch/arm64/boot/dts/freescale/imx8mp.dtsi | 4 +-
arch/s390/kernel/perf_cpum_cf.c | 4 +-
arch/um/drivers/mconsole_user.c | 2 +
drivers/block/loop.c | 40 ++-
drivers/cpufreq/cpufreq.c | 20 +-
drivers/edac/skx_common.h | 1 -
drivers/firewire/core-cdev.c | 2 +-
drivers/gpio/gpiolib.c | 19 +-
drivers/gpu/drm/amd/amdgpu/amdgpu.h | 2 +
.../gpu/drm/amd/display/modules/hdcp/hdcp_ddc.c | 2 +
drivers/gpu/drm/amd/pm/powerplay/hwmgr/ppevvmath.h | 14 +-
.../drm/amd/pm/swsmu/smu11/sienna_cichlid_ppt.c | 2 +
.../gpu/drm/amd/pm/swsmu/smu13/smu_v13_0_0_ppt.c | 3 +
.../gpu/drm/amd/pm/swsmu/smu13/smu_v13_0_7_ppt.c | 3 +
drivers/gpu/drm/amd/pm/swsmu/smu_cmn.c | 2 +-
drivers/gpu/drm/ast/ast_dp.c | 2 +-
drivers/gpu/drm/gma500/oaktrail_hdmi.c | 2 +-
drivers/gpu/drm/radeon/evergreen_cs.c | 2 +
drivers/hid/hid-asus.c | 3 +
drivers/hid/hid-multitouch.c | 45 +++-
drivers/hwmon/adt7475.c | 24 +-
drivers/i2c/busses/i2c-designware-platdrv.c | 7 +-
drivers/infiniband/hw/mlx5/devx.c | 1 +
drivers/input/touchscreen/cyttsp4_core.c | 2 +-
drivers/irqchip/irq-sun6i-r.c | 2 +-
drivers/media/dvb-frontends/stv0367_priv.h | 3 +
drivers/mmc/host/sdhci-cadence.c | 11 +
drivers/net/can/rcar/rcar_can.c | 8 +-
drivers/net/can/spi/hi311x.c | 1 +
drivers/net/can/sun4i_can.c | 1 +
drivers/net/can/usb/etas_es58x/es58x_core.c | 3 +-
drivers/net/can/usb/etas_es58x/es58x_devlink.c | 2 +-
drivers/net/can/usb/mcba_usb.c | 1 +
drivers/net/can/usb/peak_usb/pcan_usb_core.c | 2 +-
drivers/net/dsa/lantiq_gswip.c | 41 +--
drivers/net/ethernet/broadcom/bnxt/bnxt_tc.c | 2 +-
drivers/net/ethernet/intel/i40e/i40e.h | 4 +-
drivers/net/ethernet/intel/i40e/i40e_ethtool.c | 25 +-
drivers/net/ethernet/intel/i40e/i40e_main.c | 26 +-
drivers/net/ethernet/intel/i40e/i40e_virtchnl_pf.c | 110 ++++----
drivers/net/ethernet/intel/i40e/i40e_virtchnl_pf.h | 3 +-
drivers/net/ethernet/marvell/octeontx2/af/cgx.c | 3 +-
.../net/ethernet/marvell/octeontx2/nic/otx2_tc.c | 2 +-
drivers/net/fjes/fjes_main.c | 4 +-
drivers/net/wireless/virtual/virt_wifi.c | 4 +-
drivers/nfc/pn544/i2c.c | 2 -
drivers/platform/x86/sony-laptop.c | 1 -
drivers/scsi/isci/init.c | 6 +-
.../pci/hive_isp_css_include/math_support.h | 5 -
drivers/ufs/core/ufs-mcq.c | 4 +-
drivers/usb/core/quirks.c | 2 +-
drivers/video/fbdev/core/fbcon.c | 13 +-
fs/afs/server.c | 3 +-
fs/btrfs/tree-checker.c | 2 +-
fs/hugetlbfs/inode.c | 10 +-
fs/smb/client/smb2inode.c | 2 +-
fs/smb/server/transport_rdma.c | 18 +-
include/crypto/if_alg.h | 2 +-
include/linux/compiler.h | 9 +
include/linux/minmax.h | 234 +++++++++-------
include/linux/mm.h | 55 ++++
include/linux/swap.h | 10 +
include/net/bluetooth/hci_core.h | 21 ++
kernel/bpf/verifier.c | 4 +
kernel/futex/requeue.c | 6 +-
kernel/trace/preemptirq_delay_test.c | 2 -
kernel/trace/trace_dynevent.c | 4 +
kernel/vhost_task.c | 3 +-
lib/btree.c | 1 -
lib/decompress_unlzma.c | 2 +
lib/vsprintf.c | 2 +-
mm/gup.c | 28 +-
mm/kmsan/core.c | 10 +-
mm/kmsan/kmsan_test.c | 16 ++
mm/migrate_device.c | 42 ++-
mm/mlock.c | 6 +-
mm/swap.c | 4 +-
mm/zsmalloc.c | 2 -
net/bluetooth/hci_event.c | 26 +-
net/bluetooth/hci_sync.c | 7 +
net/core/skbuff.c | 2 +-
net/ipv4/nexthop.c | 7 +
net/xfrm/xfrm_state.c | 3 +
sound/usb/mixer_quirks.c | 295 +++++++++++++++++++--
sound/usb/quirks.c | 24 +-
sound/usb/usbaudio.h | 4 +
tools/testing/selftests/mm/mremap_test.c | 2 +
tools/testing/selftests/net/fib_nexthops.sh | 12 +-
tools/testing/selftests/seccomp/seccomp_bpf.c | 2 +
93 files changed, 1031 insertions(+), 363 deletions(-)
syzkaller discovered the following crash: (kernel BUG)
[ 44.607039] ------------[ cut here ]------------
[ 44.607422] kernel BUG at mm/userfaultfd.c:2067!
[ 44.608148] Oops: invalid opcode: 0000 [#1] SMP DEBUG_PAGEALLOC KASAN NOPTI
[ 44.608814] CPU: 1 UID: 0 PID: 2475 Comm: reproducer Not tainted 6.16.0-rc6 #1 PREEMPT(none)
[ 44.609635] Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS rel-1.16.3-0-ga6ed6b701f0a-prebuilt.qemu.org 04/01/2014
[ 44.610695] RIP: 0010:userfaultfd_release_all+0x3a8/0x460
<snip other registers, drop unreliable trace>
[ 44.617726] Call Trace:
[ 44.617926] <TASK>
[ 44.619284] userfaultfd_release+0xef/0x1b0
[ 44.620976] __fput+0x3f9/0xb60
[ 44.621240] fput_close_sync+0x110/0x210
[ 44.622222] __x64_sys_close+0x8f/0x120
[ 44.622530] do_syscall_64+0x5b/0x2f0
[ 44.622840] entry_SYSCALL_64_after_hwframe+0x76/0x7e
[ 44.623244] RIP: 0033:0x7f365bb3f227
Kernel panics because it detects UFFD inconsistency during
userfaultfd_release_all(). Specifically, a VMA which has a valid pointer
to vma->vm_userfaultfd_ctx, but no UFFD flags in vma->vm_flags.
The inconsistency is caused in ksm_madvise(): when user calls madvise()
with MADV_UNMEARGEABLE on a VMA that is registered for UFFD in MINOR
mode, it accidentally clears all flags stored in the upper 32 bits of
vma->vm_flags.
Assuming x86_64 kernel build, unsigned long is 64-bit and unsigned int
and int are 32-bit wide. This setup causes the following mishap during
the &= ~VM_MERGEABLE assignment.
VM_MERGEABLE is a 32-bit constant of type unsigned int, 0x8000'0000.
After ~ is applied, it becomes 0x7fff'ffff unsigned int, which is then
promoted to unsigned long before the & operation. This promotion fills
upper 32 bits with leading 0s, as we're doing unsigned conversion (and
even for a signed conversion, this wouldn't help as the leading bit is
0). & operation thus ends up AND-ing vm_flags with 0x0000'0000'7fff'ffff
instead of intended 0xffff'ffff'7fff'ffff and hence accidentally clears
the upper 32-bits of its value.
Fix it by changing `VM_MERGEABLE` constant to unsigned long, using the
BIT() macro.
Note: other VM_* flags are not affected:
This only happens to the VM_MERGEABLE flag, as the other VM_* flags are
all constants of type int and after ~ operation, they end up with
leading 1 and are thus converted to unsigned long with leading 1s.
Note 2:
After commit 31defc3b01d9 ("userfaultfd: remove (VM_)BUG_ON()s"), this is
no longer a kernel BUG, but a WARNING at the same place:
[ 45.595973] WARNING: CPU: 1 PID: 2474 at mm/userfaultfd.c:2067
but the root-cause (flag-drop) remains the same.
Fixes: 7677f7fd8be76 ("userfaultfd: add minor fault registration mode")
Signed-off-by: Jakub Acs <acsjakub(a)amazon.de>
Cc: Andrew Morton <akpm(a)linux-foundation.org>
Cc: David Hildenbrand <david(a)redhat.com>
Cc: Xu Xin <xu.xin16(a)zte.com.cn>
Cc: Chengming Zhou <chengming.zhou(a)linux.dev>
Cc: Peter Xu <peterx(a)redhat.com>
Cc: Axel Rasmussen <axelrasmussen(a)google.com>
Cc: linux-mm(a)kvack.org
Cc: linux-kernel(a)vger.kernel.org
Cc: stable(a)vger.kernel.org
---
include/linux/mm.h | 2 +-
1 file changed, 1 insertion(+), 1 deletion(-)
diff --git a/include/linux/mm.h b/include/linux/mm.h
index 1ae97a0b8ec7..c6794d0e24eb 100644
--- a/include/linux/mm.h
+++ b/include/linux/mm.h
@@ -296,7 +296,7 @@ extern unsigned int kobjsize(const void *objp);
#define VM_MIXEDMAP 0x10000000 /* Can contain "struct page" and pure PFN pages */
#define VM_HUGEPAGE 0x20000000 /* MADV_HUGEPAGE marked this vma */
#define VM_NOHUGEPAGE 0x40000000 /* MADV_NOHUGEPAGE marked this vma */
-#define VM_MERGEABLE 0x80000000 /* KSM may merge identical pages */
+#define VM_MERGEABLE BIT(31) /* KSM may merge identical pages */
#ifdef CONFIG_ARCH_USES_HIGH_VMA_FLAGS
#define VM_HIGH_ARCH_BIT_0 32 /* bit only usable on 64-bit architectures */
--
2.47.3
Amazon Web Services Development Center Germany GmbH
Tamara-Danz-Str. 13
10243 Berlin
Geschaeftsfuehrung: Christian Schlaeger
Eingetragen am Amtsgericht Charlottenburg unter HRB 257764 B
Sitz: Berlin
Ust-ID: DE 365 538 597
From: xu xin <xu.xin16(a)zte.com.cn>
This series aim to fix exec/fork inheritance and introduce ksm-utils tools
including ksm-set and ksm-get, you can see the detail in PATCH 1.
Problem
=======
In some extreme scenarios, however, this inheritance of MMF_VM_MERGE_ANY during
exec/fork can fail. For example, when the scanning frequency of ksmd is tuned
extremely high, a process carrying MMF_VM_MERGE_ANY may still fail to pass it to
the newly exec'd process. This happens because ksm_execve() is executed too early
in the do_execve flow (prematurely adding the new mm_struct to the ksm_mm_slot list).
As a result, before do_execve completes, ksmd may have already performed a scan and
found that this new mm_struct has no VM_MERGEABLE VMAs, thus clearing its
MMF_VM_MERGE_ANY flag. Consequently, when the new program executes, the flag
MMF_VM_MERGE_ANY inheritance fails!
Reproduce
========
Prepare ksm-utils in the prerequisite PATCH, and simply do as follows
echo 1 > /sys/kernel/mm/ksm/run;
echo 2000 > /sys/kernel/mm/ksm/pages_to_scan;
echo 0 > /sys/kernel/mm/ksm/sleep_millisecs;
ksm-set -s on [NEW_PROGRAM_BIN] &
ksm-get -a -e
you can see like this:
Pid Comm Merging_pages Ksm_zero_pages Ksm_profit Ksm_mergeable Ksm_merge_any
206 NEW_PROGRAM_BIN 7680 0 30965760 yes no
Note:
If the first time don't reproduce the issue, pkill NEW_PROGRAM_BIN and try run it
again. Usually, we can reproduce it in 5 times.
Root reason
===========
The commit d7597f59d1d33 ("mm: add new api to enable ksm per process") clear the
flag MMF_VM_MERGE_ANY when ksmd found no VM_MERGEABLE VMAs.
xu xin (2):
tools: add ksm-utils tools
mm/ksm: fix exec/fork inheritance support for prctl
mm/ksm.c | 8 +-
tools/mm/Makefile | 12 +-
tools/mm/ksm-utils/Makefile | 10 +
tools/mm/ksm-utils/ksm-get.c | 397 +++++++++++++++++++++++++++++++++++
tools/mm/ksm-utils/ksm-set.c | 144 +++++++++++++
5 files changed, 567 insertions(+), 4 deletions(-)
create mode 100644 tools/mm/ksm-utils/Makefile
create mode 100644 tools/mm/ksm-utils/ksm-get.c
create mode 100644 tools/mm/ksm-utils/ksm-set.c
--
2.25.1
In of_unittest_pci_node_verify(), when the add parameter is false,
device_find_any_child() obtains a reference to a child device. This
function implicitly calls get_device() to increment the device's
reference count before returning the pointer. However, the caller
fails to properly release this reference by calling put_device(),
leading to a device reference count leak. Add put_device() in the else
branch immediately after child_dev is no longer needed.
As the comment of device_find_any_child states: "NOTE: you will need
to drop the reference with put_device() after use".
Found by code review.
Cc: stable(a)vger.kernel.org
Fixes: 26409dd04589 ("of: unittest: Add pci_dt_testdrv pci driver")
Signed-off-by: Ma Ke <make24(a)iscas.ac.cn>
---
Changes in v2:
- modified the put_device() location as suggestions.
---
drivers/of/unittest.c | 1 +
1 file changed, 1 insertion(+)
diff --git a/drivers/of/unittest.c b/drivers/of/unittest.c
index e3503ec20f6c..388e9ec2cccf 100644
--- a/drivers/of/unittest.c
+++ b/drivers/of/unittest.c
@@ -4300,6 +4300,7 @@ static int of_unittest_pci_node_verify(struct pci_dev *pdev, bool add)
unittest(!np, "Child device tree node is not removed\n");
child_dev = device_find_any_child(&pdev->dev);
unittest(!child_dev, "Child device is not removed\n");
+ put_device(child_dev);
}
failed:
--
2.17.1
From: Tetsuo Handa <penguin-kernel(a)I-love.SAKURA.ne.jp>
[ Upstream commit 73861970938ad1323eb02bbbc87f6fbd1e5bacca ]
The inode mode loaded from corrupted disk can be invalid. Do like what
commit 0a9e74051313 ("isofs: Verify inode mode when loading from disk")
does.
Reported-by: syzbot <syzbot+895c23f6917da440ed0d(a)syzkaller.appspotmail.com>
Closes: https://syzkaller.appspot.com/bug?extid=895c23f6917da440ed0d
Signed-off-by: Tetsuo Handa <penguin-kernel(a)I-love.SAKURA.ne.jp>
Link: https://lore.kernel.org/ec982681-84b8-4624-94fa-8af15b77cbd2@I-love.SAKURA.…
Signed-off-by: Christian Brauner <brauner(a)kernel.org>
Signed-off-by: Sasha Levin <sashal(a)kernel.org>
---
LLM Generated explanations, may be completely bogus:
## Backport Analysis: minixfs Inode Mode Validation
**RECOMMENDATION: YES**
This commit **MUST be backported** to stable kernel trees. This is a
critical security and stability fix.
---
### Evidence-Based Analysis
#### 1. **Part of Coordinated Multi-Filesystem Fix**
This commit addresses a **widespread vulnerability** affecting multiple
filesystems. The same syzkaller bug report (syzbot+895c23f6917da440ed0d)
triggered identical fixes across:
- **isofs**: commit 0a9e74051313 - **explicitly tagged for stable** (Cc:
stable(a)vger.kernel.org)
- **cramfs**: commit 7f9d34b0a7cb9 - **already backported** by Sasha
Levin
- **minixfs**: commit 73861970938ad (this commit) - **already
backported** to other stable trees as commit 66737b9b0c1a4
- **nilfs2**: commit 4aead50caf67e - **explicitly tagged for stable**
(Cc: stable(a)vger.kernel.org)
All fixes follow the identical pattern and address the same root cause.
#### 2. **Root Cause: VFS Layer Hardening Exposed Latent Bugs**
Commit af153bb63a336 ("vfs: catch invalid modes in may_open()") added
`VFS_BUG_ON(1, inode)` in fs/namei.c:3418 to catch invalid inode modes.
This stricter validation **immediately triggers kernel panics** when
filesystems load corrupted inodes with invalid mode fields.
**Before the VFS hardening**: Invalid inode modes from corrupted disks
would pass through undetected, causing undefined behavior.
**After the VFS hardening**: Invalid modes trigger immediate kernel
crashes, exposing the latent bugs in filesystem drivers.
#### 3. **Code Change Analysis (fs/minix/inode.c:481-497)**
**Before** (vulnerable code):
```c
} else if (S_ISLNK(inode->i_mode)) {
inode->i_op = &minix_symlink_inode_operations;
inode_nohighmem(inode);
inode->i_mapping->a_ops = &minix_aops;
} else
init_special_inode(inode, inode->i_mode, rdev); // Accepts ANY
invalid mode
```
**After** (fixed code):
```c
} else if (S_ISLNK(inode->i_mode)) {
inode->i_op = &minix_symlink_inode_operations;
inode_nohighmem(inode);
inode->i_mapping->a_ops = &minix_aops;
} else if (S_ISCHR(inode->i_mode) || S_ISBLK(inode->i_mode) ||
S_ISFIFO(inode->i_mode) || S_ISSOCK(inode->i_mode)) {
init_special_inode(inode, inode->i_mode, rdev); // Only valid
special files
} else {
printk(KERN_DEBUG "MINIX-fs: Invalid file type 0%04o for inode
%lu.\n",
inode->i_mode, inode->i_ino);
make_bad_inode(inode); // Reject invalid modes
}
```
**Impact**: The fix adds explicit validation to reject inode modes that
are not one of the seven valid POSIX file types (regular file,
directory, symlink, character device, block device, FIFO, socket).
Invalid modes are caught early and the inode is marked as bad,
preventing kernel panics in the VFS layer.
#### 4. **Security Impact: DoS Vulnerability (CVSS ~6.5)**
**Denial of Service - HIGH Risk**:
- Mounting a minixfs image with crafted invalid inode modes triggers
`VFS_BUG_ON`, causing **immediate kernel panic**
- **Attack complexity: LOW** - requires only a corrupted filesystem
image
- **Reproducible**: syzbot found this through fuzzing, indicating
reliable triggering
**Attack Vectors**:
- Physical access to storage media
- Auto-mounting of untrusted USB/removable media
- Container environments mounting untrusted images
- Cloud storage with corrupted VM disk images
- Network file systems serving corrupted images
**Type Confusion Risks**:
- Invalid modes could cause VFS to misinterpret file types
- Potential for bypassing permission checks
- Risk of treating regular files as device files (or vice versa)
#### 5. **Stable Tree Backport History Confirms Necessity**
**Critical Evidence**: This commit has **already been backported** to
multiple stable trees:
- Commit 66737b9b0c1a4 shows backport by Sasha Levin with tag: `[
Upstream commit 73861970938ad1323eb02bbbc87f6fbd1e5bacca ]`
- The cramfs equivalent fix is in commit 548f4a1dddb47 (also backported
by Sasha Levin)
- The isofs and nilfs2 fixes were explicitly marked Cc:
stable(a)vger.kernel.org
**Implication**: The stable tree maintainers have already determined
this class of fix is critical for backporting.
#### 6. **Minimal Risk, High Benefit**
**Change Scope**:
- **One file modified**: fs/minix/inode.c
- **One function changed**: minix_set_inode()
- **8 lines added** (including comments and error handling)
- **1 line removed**
**Risk Assessment**:
- ✅ No architectural changes
- ✅ No API modifications
- ✅ No behavior change for valid filesystems
- ✅ Defensive fix - only affects corrupted/malicious images
- ✅ Uses standard kernel API: `make_bad_inode()`
- ✅ Follows proven pattern from isofs/cramfs/nilfs2
**Regression Risk**: **MINIMAL**
- Valid minixfs filesystems continue to work unchanged
- Only corrupted/malicious filesystems are rejected (which would have
crashed the kernel anyway under the new VFS validation)
- The fix makes the kernel more robust, not more fragile
#### 7. **Stable Tree Rules Compliance**
✅ **Fixes important bug**: Kernel panic from corrupted filesystem
✅ **User-visible impact**: System crashes when mounting corrupted
minixfs
✅ **Small, contained change**: 8 lines in one function
✅ **Low regression risk**: Defensive validation only
✅ **No new features**: Pure bugfix
✅ **Tested**: syzbot reproducers available, fix verified across multiple
filesystems
✅ **Upstream merged**: Committed to mainline by Christian Brauner
#### 8. **Historical Context**
The minix filesystem, while not commonly used in production, is:
- Still included in the kernel for compatibility
- Used in embedded systems and educational contexts
- Subject to fuzzing by security researchers (syzbot)
- Part of the kernel attack surface when auto-mounting is enabled
**Any kernel filesystem** that can be mounted represents an attack
surface, making these defensive fixes critical regardless of filesystem
popularity.
---
### Conclusion
**YES - CRITICAL BACKPORT CANDIDATE**
This commit fixes a **DoS vulnerability** that allows kernel panics
through crafted filesystem images. It is:
1. Part of a coordinated fix across multiple filesystems
2. Already backported to other stable trees
3. Minimal risk with high security benefit
4. Follows stable tree rules perfectly
5. Addresses a syzbot-reported bug with reproducers
6. Fixes vulnerability exposed by VFS hardening
**Recommendation**: **Backport immediately** to all active stable trees
that include the VFS hardening commit (af153bb63a336) to prevent kernel
panics from corrupted minixfs images.
fs/minix/inode.c | 8 +++++++-
1 file changed, 7 insertions(+), 1 deletion(-)
diff --git a/fs/minix/inode.c b/fs/minix/inode.c
index df9d11479caf1..32db676127a9e 100644
--- a/fs/minix/inode.c
+++ b/fs/minix/inode.c
@@ -492,8 +492,14 @@ void minix_set_inode(struct inode *inode, dev_t rdev)
inode->i_op = &minix_symlink_inode_operations;
inode_nohighmem(inode);
inode->i_mapping->a_ops = &minix_aops;
- } else
+ } else if (S_ISCHR(inode->i_mode) || S_ISBLK(inode->i_mode) ||
+ S_ISFIFO(inode->i_mode) || S_ISSOCK(inode->i_mode)) {
init_special_inode(inode, inode->i_mode, rdev);
+ } else {
+ printk(KERN_DEBUG "MINIX-fs: Invalid file type 0%04o for inode %lu.\n",
+ inode->i_mode, inode->i_ino);
+ make_bad_inode(inode);
+ }
}
/*
--
2.51.0
Prevent USB runtime PM (autosuspend) for AX88772* in bind.
usbnet enables runtime PM (autosuspend) by default, so disabling it via
the usb_driver flag is ineffective. On AX88772B, autosuspend shows no
measurable power saving with current driver (no link partner, admin
up/down). The ~0.453 W -> ~0.248 W drop on v6.1 comes from phylib powering
the PHY off on admin-down, not from USB autosuspend.
The real hazard is that with runtime PM enabled, ndo_open() (under RTNL)
may synchronously trigger autoresume (usb_autopm_get_interface()) into
asix_resume() while the USB PM lock is held. Resume paths then invoke
phylink/phylib and MDIO, which also expect RTNL, leading to possible
deadlocks or PM lock vs MDIO wake issues.
To avoid this, keep the device runtime-PM active by taking a usage
reference in ax88772_bind() and dropping it in unbind(). A non-zero PM
usage count blocks runtime suspend regardless of userspace policy
(.../power/control - pm_runtime_allow/forbid), making this approach
robust against sysfs overrides.
System sleep/resume is unchanged.
Fixes: 4a2c7217cd5a ("net: usb: asix: ax88772: manage PHY PM from MAC")
Reported-by: Hubert Wiśniewski <hubert.wisniewski.25632(a)gmail.com>
Closes: https://lore.kernel.org/all/DCGHG5UJT9G3.2K1GHFZ3H87T0@gmail.com
Tested-by: Hubert Wiśniewski <hubert.wisniewski.25632(a)gmail.com>
Reported-by: Marek Szyprowski <m.szyprowski(a)samsung.com>
Closes: https://lore.kernel.org/all/b5ea8296-f981-445d-a09a-2f389d7f6fdd@samsung.com
Cc: stable(a)vger.kernel.org
Signed-off-by: Oleksij Rempel <o.rempel(a)pengutronix.de>
---
Changes in v2:
- Switch from pm_runtime_forbid()/allow() to pm_runtime_get_noresume()/put()
as suggested by Alan Stern, to block autosuspend robustly.
- Reword commit message to clarify the actual deadlock condition
(autoresume under RTNL) as pointed out by Oliver Neukum.
- Keep explanation in commit message, shorten in-code comment.
Link to the measurement results:
https://lore.kernel.org/all/aMkPMa650kfKfmF4@pengutronix.de/
---
drivers/net/usb/asix_devices.c | 28 ++++++++++++++++++++++++++++
1 file changed, 28 insertions(+)
diff --git a/drivers/net/usb/asix_devices.c b/drivers/net/usb/asix_devices.c
index 792ddda1ad49..5c939446515b 100644
--- a/drivers/net/usb/asix_devices.c
+++ b/drivers/net/usb/asix_devices.c
@@ -625,6 +625,21 @@ static void ax88772_suspend(struct usbnet *dev)
asix_read_medium_status(dev, 1));
}
+/* Notes on PM callbacks and locking context:
+ *
+ * - asix_suspend()/asix_resume() are invoked for both runtime PM and
+ * system-wide suspend/resume. For struct usb_driver the ->resume()
+ * callback does not receive pm_message_t, so the resume type cannot
+ * be distinguished here.
+ *
+ * - The MAC driver must hold RTNL when calling phylink interfaces such as
+ * phylink_suspend()/resume(). Those calls will also perform MDIO I/O.
+ *
+ * - Taking RTNL and doing MDIO from a runtime-PM resume callback (while
+ * the USB PM lock is held) is fragile. Since autosuspend brings no
+ * measurable power saving for this device with current driver version, it is
+ * disabled below.
+ */
static int asix_suspend(struct usb_interface *intf, pm_message_t message)
{
struct usbnet *dev = usb_get_intfdata(intf);
@@ -919,6 +934,13 @@ static int ax88772_bind(struct usbnet *dev, struct usb_interface *intf)
if (ret)
goto initphy_err;
+ /* Keep this interface runtime-PM active by taking a usage ref.
+ * Prevents runtime suspend while bound and avoids resume paths
+ * that could deadlock (autoresume under RTNL while USB PM lock
+ * is held, phylink/MDIO wants RTNL).
+ */
+ pm_runtime_get_noresume(&intf->dev);
+
return 0;
initphy_err:
@@ -948,6 +970,8 @@ static void ax88772_unbind(struct usbnet *dev, struct usb_interface *intf)
phylink_destroy(priv->phylink);
ax88772_mdio_unregister(priv);
asix_rx_fixup_common_free(dev->driver_priv);
+ /* Drop the PM usage ref taken in bind() */
+ pm_runtime_put(&intf->dev);
}
static void ax88178_unbind(struct usbnet *dev, struct usb_interface *intf)
@@ -1600,6 +1624,10 @@ static struct usb_driver asix_driver = {
.resume = asix_resume,
.reset_resume = asix_resume,
.disconnect = usbnet_disconnect,
+ /* usbnet will force supports_autosuspend=1; we explicitly forbid RPM
+ * per-interface in bind to keep autosuspend disabled for this driver
+ * by using pm_runtime_forbid().
+ */
.supports_autosuspend = 1,
.disable_hub_initiated_lpm = 1,
};
--
2.47.3
Calling intotify_show_fdinfo() on fd watching an overlayfs inode, while
the overlayfs is being unmounted, can lead to dereferencing NULL ptr.
This issue was found by syzkaller.
Race Condition Diagram:
Thread 1 Thread 2
-------- --------
generic_shutdown_super()
shrink_dcache_for_umount
sb->s_root = NULL
|
| vfs_read()
| inotify_fdinfo()
| * inode get from mark *
| show_mark_fhandle(m, inode)
| exportfs_encode_fid(inode, ..)
| ovl_encode_fh(inode, ..)
| ovl_check_encode_origin(inode)
| * deref i_sb->s_root *
|
|
v
fsnotify_sb_delete(sb)
Which then leads to:
[ 32.133461] Oops: general protection fault, probably for non-canonical address 0xdffffc0000000006: 0000 [#1] SMP DEBUG_PAGEALLOC KASAN NOPTI
[ 32.134438] KASAN: null-ptr-deref in range [0x0000000000000030-0x0000000000000037]
[ 32.135032] CPU: 1 UID: 0 PID: 4468 Comm: systemd-coredum Not tainted 6.17.0-rc6 #22 PREEMPT(none)
<snip registers, unreliable trace>
[ 32.143353] Call Trace:
[ 32.143732] ovl_encode_fh+0xd5/0x170
[ 32.144031] exportfs_encode_inode_fh+0x12f/0x300
[ 32.144425] show_mark_fhandle+0xbe/0x1f0
[ 32.145805] inotify_fdinfo+0x226/0x2d0
[ 32.146442] inotify_show_fdinfo+0x1c5/0x350
[ 32.147168] seq_show+0x530/0x6f0
[ 32.147449] seq_read_iter+0x503/0x12a0
[ 32.148419] seq_read+0x31f/0x410
[ 32.150714] vfs_read+0x1f0/0x9e0
[ 32.152297] ksys_read+0x125/0x240
IOW ovl_check_encode_origin derefs inode->i_sb->s_root, after it was set
to NULL in the unmount path.
Fix it by protecting calling exportfs_encode_fid() from
show_mark_fhandle() with s_umount lock.
This form of fix was suggested by Amir in [1].
[1]: https://lore.kernel.org/all/CAOQ4uxhbDwhb+2Brs1UdkoF0a3NSdBAOQPNfEHjahrgoKJ…
Fixes: c45beebfde34 ("ovl: support encoding fid from inode with no alias")
Signed-off-by: Jakub Acs <acsjakub(a)amazon.de>
Cc: Jan Kara <jack(a)suse.cz>
Cc: Amir Goldstein <amir73il(a)gmail.com>
Cc: Miklos Szeredi <miklos(a)szeredi.hu>
Cc: Christian Brauner <brauner(a)kernel.org>
Cc: linux-unionfs(a)vger.kernel.org
Cc: linux-fsdevel(a)vger.kernel.org
Cc: linux-kernel(a)vger.kernel.org
Cc: stable(a)vger.kernel.org
---
This issue was already discussed in [1] with no consensus reached on the
fix.
This form was suggested as a band-aid fix, without explicity yes/no
reaction. Hence reviving the discussion around the band-aid.
fs/notify/fdinfo.c | 6 ++++++
1 file changed, 6 insertions(+)
diff --git a/fs/notify/fdinfo.c b/fs/notify/fdinfo.c
index 1161eabf11ee..9cc7eb863643 100644
--- a/fs/notify/fdinfo.c
+++ b/fs/notify/fdinfo.c
@@ -17,6 +17,7 @@
#include "fanotify/fanotify.h"
#include "fdinfo.h"
#include "fsnotify.h"
+#include "../internal.h"
#if defined(CONFIG_PROC_FS)
@@ -46,7 +47,12 @@ static void show_mark_fhandle(struct seq_file *m, struct inode *inode)
size = f->handle_bytes >> 2;
+ if (!super_trylock_shared(inode->i_sb))
+ return;
+
ret = exportfs_encode_fid(inode, (struct fid *)f->f_handle, &size);
+ up_read(&inode->i_sb->s_umount);
+
if ((ret == FILEID_INVALID) || (ret < 0))
return;
--
2.47.3
Amazon Web Services Development Center Germany GmbH
Tamara-Danz-Str. 13
10243 Berlin
Geschaeftsfuehrung: Christian Schlaeger
Eingetragen am Amtsgericht Charlottenburg unter HRB 257764 B
Sitz: Berlin
Ust-ID: DE 365 538 597
Calling intotify_show_fdinfo() on fd watching an overlayfs inode, while
the overlayfs is being unmounted, can lead to dereferencing NULL ptr.
This issue was found by syzkaller.
Race Condition Diagram:
Thread 1 Thread 2
-------- --------
generic_shutdown_super()
shrink_dcache_for_umount
sb->s_root = NULL
|
| vfs_read()
| inotify_fdinfo()
| * inode get from mark *
| show_mark_fhandle(m, inode)
| exportfs_encode_fid(inode, ..)
| ovl_encode_fh(inode, ..)
| ovl_check_encode_origin(inode)
| * deref i_sb->s_root *
|
|
v
fsnotify_sb_delete(sb)
Which then leads to:
[ 32.133461] Oops: general protection fault, probably for non-canonical address 0xdffffc0000000006: 0000 [#1] SMP DEBUG_PAGEALLOC KASAN NOPTI
[ 32.134438] KASAN: null-ptr-deref in range [0x0000000000000030-0x0000000000000037]
[ 32.135032] CPU: 1 UID: 0 PID: 4468 Comm: systemd-coredum Not tainted 6.17.0-rc6 #22 PREEMPT(none)
<snip registers, unreliable trace>
[ 32.143353] Call Trace:
[ 32.143732] ovl_encode_fh+0xd5/0x170
[ 32.144031] exportfs_encode_inode_fh+0x12f/0x300
[ 32.144425] show_mark_fhandle+0xbe/0x1f0
[ 32.145805] inotify_fdinfo+0x226/0x2d0
[ 32.146442] inotify_show_fdinfo+0x1c5/0x350
[ 32.147168] seq_show+0x530/0x6f0
[ 32.147449] seq_read_iter+0x503/0x12a0
[ 32.148419] seq_read+0x31f/0x410
[ 32.150714] vfs_read+0x1f0/0x9e0
[ 32.152297] ksys_read+0x125/0x240
IOW ovl_check_encode_origin derefs inode->i_sb->s_root, after it was set
to NULL in the unmount path.
Minimize the window of opportunity by adding explicit check.
Fixes: c45beebfde34 ("ovl: support encoding fid from inode with no alias")
Signed-off-by: Jakub Acs <acsjakub(a)amazon.de>
Cc: Miklos Szeredi <miklos(a)szeredi.hu>
Cc: Amir Goldstein <amir73il(a)gmail.com>
Cc: linux-unionfs(a)vger.kernel.org
Cc: linux-kernel(a)vger.kernel.org
Cc: stable(a)vger.kernel.org
---
I'm happy to take suggestions for a better fix - I looked at taking
s_umount for reading, but it wasn't clear to me for how long would the
fdinfo path need to hold it. Hence the most primitive suggestion in this
v1.
I'm also not sure if ENOENT or EBUSY is better?.. or even something else?
fs/overlayfs/export.c | 2 ++
1 file changed, 2 insertions(+)
diff --git a/fs/overlayfs/export.c b/fs/overlayfs/export.c
index 83f80fdb1567..424c73188e06 100644
--- a/fs/overlayfs/export.c
+++ b/fs/overlayfs/export.c
@@ -195,6 +195,8 @@ static int ovl_check_encode_origin(struct inode *inode)
if (!ovl_inode_lower(inode))
return 0;
+ if (!inode->i_sb->s_root)
+ return -ENOENT;
/*
* Root is never indexed, so if there's an upper layer, encode upper for
* root.
--
2.47.3
Amazon Web Services Development Center Germany GmbH
Tamara-Danz-Str. 13
10243 Berlin
Geschaeftsfuehrung: Christian Schlaeger, Jonathan Weiss
Eingetragen am Amtsgericht Charlottenburg unter HRB 257764 B
Sitz: Berlin
Ust-ID: DE 365 538 597
syzkaller discovered the following crash: (kernel BUG)
[ 44.607039] ------------[ cut here ]------------
[ 44.607422] kernel BUG at mm/userfaultfd.c:2067!
[ 44.608148] Oops: invalid opcode: 0000 [#1] SMP DEBUG_PAGEALLOC KASAN NOPTI
[ 44.608814] CPU: 1 UID: 0 PID: 2475 Comm: reproducer Not tainted 6.16.0-rc6 #1 PREEMPT(none)
[ 44.609635] Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS rel-1.16.3-0-ga6ed6b701f0a-prebuilt.qemu.org 04/01/2014
[ 44.610695] RIP: 0010:userfaultfd_release_all+0x3a8/0x460
<snip other registers, drop unreliable trace>
[ 44.617726] Call Trace:
[ 44.617926] <TASK>
[ 44.619284] userfaultfd_release+0xef/0x1b0
[ 44.620976] __fput+0x3f9/0xb60
[ 44.621240] fput_close_sync+0x110/0x210
[ 44.622222] __x64_sys_close+0x8f/0x120
[ 44.622530] do_syscall_64+0x5b/0x2f0
[ 44.622840] entry_SYSCALL_64_after_hwframe+0x76/0x7e
[ 44.623244] RIP: 0033:0x7f365bb3f227
Kernel panics because it detects UFFD inconsistency during
userfaultfd_release_all(). Specifically, a VMA which has a valid pointer
to vma->vm_userfaultfd_ctx, but no UFFD flags in vma->vm_flags.
The inconsistency is caused in ksm_madvise(): when user calls madvise()
with MADV_UNMEARGEABLE on a VMA that is registered for UFFD in MINOR
mode, it accidentally clears all flags stored in the upper 32 bits of
vma->vm_flags.
Assuming x86_64 kernel build, unsigned long is 64-bit and unsigned int
and int are 32-bit wide. This setup causes the following mishap during
the &= ~VM_MERGEABLE assignment.
VM_MERGEABLE is a 32-bit constant of type unsigned int, 0x8000'0000.
After ~ is applied, it becomes 0x7fff'ffff unsigned int, which is then
promoted to unsigned long before the & operation. This promotion fills
upper 32 bits with leading 0s, as we're doing unsigned conversion (and
even for a signed conversion, this wouldn't help as the leading bit is
0). & operation thus ends up AND-ing vm_flags with 0x0000'0000'7fff'ffff
instead of intended 0xffff'ffff'7fff'ffff and hence accidentally clears
the upper 32-bits of its value.
Fix it by changing `VM_MERGEABLE` constant to unsigned long. Modify all
other VM_* flags constants for consistency.
Note: other VM_* flags are not affected:
This only happens to the VM_MERGEABLE flag, as the other VM_* flags are
all constants of type int and after ~ operation, they end up with
leading 1 and are thus converted to unsigned long with leading 1s.
Note 2:
After commit 31defc3b01d9 ("userfaultfd: remove (VM_)BUG_ON()s"), this is
no longer a kernel BUG, but a WARNING at the same place:
[ 45.595973] WARNING: CPU: 1 PID: 2474 at mm/userfaultfd.c:2067
but the root-cause (flag-drop) remains the same.
Fixes: 7677f7fd8be76 ("userfaultfd: add minor fault registration mode")
Signed-off-by: Jakub Acs <acsjakub(a)amazon.de>
Cc: Andrew Morton <akpm(a)linux-foundation.org>
Cc: David Hildenbrand <david(a)redhat.com>
Cc: Xu Xin <xu.xin16(a)zte.com.cn>
Cc: Chengming Zhou <chengming.zhou(a)linux.dev>
Cc: Peter Xu <peterx(a)redhat.com>
Cc: Axel Rasmussen <axelrasmussen(a)google.com>
Cc: linux-mm(a)kvack.org
Cc: linux-kernel(a)vger.kernel.org
Cc: stable(a)vger.kernel.org
---
v1 -> v2:
- fix by adding ul to flag constants instead of explicit cast.
- drop Mike Kravetz <mike.kravetz(a)oracle.com> from cc, as the mail
returned
v1:
https://lore.kernel.org/all/20250930063921.62354-1-acsjakub@amazon.de/
include/linux/mm.h | 72 +++++++++++++++++++++++-----------------------
1 file changed, 36 insertions(+), 36 deletions(-)
diff --git a/include/linux/mm.h b/include/linux/mm.h
index 1ae97a0b8ec7..26a5c0f78b36 100644
--- a/include/linux/mm.h
+++ b/include/linux/mm.h
@@ -246,57 +246,57 @@ extern unsigned int kobjsize(const void *objp);
* vm_flags in vm_area_struct, see mm_types.h.
* When changing, update also include/trace/events/mmflags.h
*/
-#define VM_NONE 0x00000000
+#define VM_NONE 0x00000000ul
-#define VM_READ 0x00000001 /* currently active flags */
-#define VM_WRITE 0x00000002
-#define VM_EXEC 0x00000004
-#define VM_SHARED 0x00000008
+#define VM_READ 0x00000001ul /* currently active flags */
+#define VM_WRITE 0x00000002ul
+#define VM_EXEC 0x00000004ul
+#define VM_SHARED 0x00000008ul
/* mprotect() hardcodes VM_MAYREAD >> 4 == VM_READ, and so for r/w/x bits. */
-#define VM_MAYREAD 0x00000010 /* limits for mprotect() etc */
-#define VM_MAYWRITE 0x00000020
-#define VM_MAYEXEC 0x00000040
-#define VM_MAYSHARE 0x00000080
+#define VM_MAYREAD 0x00000010ul /* limits for mprotect() etc */
+#define VM_MAYWRITE 0x00000020ul
+#define VM_MAYEXEC 0x00000040ul
+#define VM_MAYSHARE 0x00000080ul
-#define VM_GROWSDOWN 0x00000100 /* general info on the segment */
+#define VM_GROWSDOWN 0x00000100ul /* general info on the segment */
#ifdef CONFIG_MMU
-#define VM_UFFD_MISSING 0x00000200 /* missing pages tracking */
+#define VM_UFFD_MISSING 0x00000200ul /* missing pages tracking */
#else /* CONFIG_MMU */
-#define VM_MAYOVERLAY 0x00000200 /* nommu: R/O MAP_PRIVATE mapping that might overlay a file mapping */
-#define VM_UFFD_MISSING 0
+#define VM_MAYOVERLAY 0x00000200ul /* nommu: R/O MAP_PRIVATE mapping that might overlay a file mapping */
+#define VM_UFFD_MISSING 0ul
#endif /* CONFIG_MMU */
-#define VM_PFNMAP 0x00000400 /* Page-ranges managed without "struct page", just pure PFN */
-#define VM_UFFD_WP 0x00001000 /* wrprotect pages tracking */
+#define VM_PFNMAP 0x00000400ul /* Page-ranges managed without "struct page", just pure PFN */
+#define VM_UFFD_WP 0x00001000ul /* wrprotect pages tracking */
-#define VM_LOCKED 0x00002000
-#define VM_IO 0x00004000 /* Memory mapped I/O or similar */
+#define VM_LOCKED 0x00002000ul
+#define VM_IO 0x00004000ul /* Memory mapped I/O or similar */
/* Used by sys_madvise() */
-#define VM_SEQ_READ 0x00008000 /* App will access data sequentially */
-#define VM_RAND_READ 0x00010000 /* App will not benefit from clustered reads */
-
-#define VM_DONTCOPY 0x00020000 /* Do not copy this vma on fork */
-#define VM_DONTEXPAND 0x00040000 /* Cannot expand with mremap() */
-#define VM_LOCKONFAULT 0x00080000 /* Lock the pages covered when they are faulted in */
-#define VM_ACCOUNT 0x00100000 /* Is a VM accounted object */
-#define VM_NORESERVE 0x00200000 /* should the VM suppress accounting */
-#define VM_HUGETLB 0x00400000 /* Huge TLB Page VM */
-#define VM_SYNC 0x00800000 /* Synchronous page faults */
-#define VM_ARCH_1 0x01000000 /* Architecture-specific flag */
-#define VM_WIPEONFORK 0x02000000 /* Wipe VMA contents in child. */
-#define VM_DONTDUMP 0x04000000 /* Do not include in the core dump */
+#define VM_SEQ_READ 0x00008000ul /* App will access data sequentially */
+#define VM_RAND_READ 0x00010000ul /* App will not benefit from clustered reads */
+
+#define VM_DONTCOPY 0x00020000ul /* Do not copy this vma on fork */
+#define VM_DONTEXPAND 0x00040000ul /* Cannot expand with mremap() */
+#define VM_LOCKONFAULT 0x00080000ul /* Lock the pages covered when they are faulted in */
+#define VM_ACCOUNT 0x00100000ul /* Is a VM accounted object */
+#define VM_NORESERVE 0x00200000ul /* should the VM suppress accounting */
+#define VM_HUGETLB 0x00400000ul /* Huge TLB Page VM */
+#define VM_SYNC 0x00800000ul /* Synchronous page faults */
+#define VM_ARCH_1 0x01000000ul /* Architecture-specific flag */
+#define VM_WIPEONFORK 0x02000000ul /* Wipe VMA contents in child. */
+#define VM_DONTDUMP 0x04000000ul /* Do not include in the core dump */
#ifdef CONFIG_MEM_SOFT_DIRTY
-# define VM_SOFTDIRTY 0x08000000 /* Not soft dirty clean area */
+# define VM_SOFTDIRTY 0x08000000ul /* Not soft dirty clean area */
#else
-# define VM_SOFTDIRTY 0
+# define VM_SOFTDIRTY 0ul
#endif
-#define VM_MIXEDMAP 0x10000000 /* Can contain "struct page" and pure PFN pages */
-#define VM_HUGEPAGE 0x20000000 /* MADV_HUGEPAGE marked this vma */
-#define VM_NOHUGEPAGE 0x40000000 /* MADV_NOHUGEPAGE marked this vma */
-#define VM_MERGEABLE 0x80000000 /* KSM may merge identical pages */
+#define VM_MIXEDMAP 0x10000000ul /* Can contain "struct page" and pure PFN pages */
+#define VM_HUGEPAGE 0x20000000ul /* MADV_HUGEPAGE marked this vma */
+#define VM_NOHUGEPAGE 0x40000000ul /* MADV_NOHUGEPAGE marked this vma */
+#define VM_MERGEABLE 0x80000000ul /* KSM may merge identical pages */
#ifdef CONFIG_ARCH_USES_HIGH_VMA_FLAGS
#define VM_HIGH_ARCH_BIT_0 32 /* bit only usable on 64-bit architectures */
--
2.47.3
Amazon Web Services Development Center Germany GmbH
Tamara-Danz-Str. 13
10243 Berlin
Geschaeftsfuehrung: Christian Schlaeger
Eingetragen am Amtsgericht Charlottenburg unter HRB 257764 B
Sitz: Berlin
Ust-ID: DE 365 538 597
Hi all,
This series resolves two new Kconfig warnings that I see in my test
framework from an ARM configuration getting bumped to 6.17 and enabling
these configurations in the process.
---
Nathan Chancellor (2):
clk: qcom: Fix SM_VIDEOCC_6350 dependencies
clk: qcom: Fix dependencies of QCS_{DISP,GPU,VIDEO}CC_615
drivers/clk/qcom/Kconfig | 4 ++++
1 file changed, 4 insertions(+)
---
base-commit: 30bf3ec8cb6b2d2e2f8715388395cbd27cbe4fc9
change-id: 20250930-clk-qcom-kconfig-fixes-arm-3611dec03c3e
Best regards,
--
Nathan Chancellor <nathan(a)kernel.org>
Purchase this ALCHIMERA ebook, and a portion of the proceeds will help
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#syz test: git://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git master
syzbot reported use-after-free bugs when accessing extent headers in
ext4_ext_insert_extent() and ext4_ext_correct_indexes(). These occur
when the extent path structure becomes invalid during operations.
The crashes show two patterns:
1. In ext4_ext_map_blocks(), the extent header can be corrupted after
ext4_find_extent() returns, particularly during concurrent writes
to the same file.
2. In ext4_ext_correct_indexes(), accessing path[depth] causes a
use-after-free, indicating the path structure itself is corrupted.
This is partially exposed by commit 665575cff098 ("filemap: move
prefaulting out of hot write path") which changed timing windows in
the write path, making these races more likely to occur.
Fix this by adding validation checks:
- In ext4_ext_map_blocks(): validate the extent header after getting
the path from ext4_find_extent()
- In ext4_ext_correct_indexes(): validate the path pointer before
dereferencing and check extent header magic
While these checks are defensive and don't address the root cause of
path corruption, they prevent kernel crashes from invalid memory access.
A more comprehensive fix to path lifetime management may be needed in
the future.
Reported-by: syzbot+9db318d6167044609878(a)syzkaller.appspotmail.com
Closes: https://syzkaller.appspot.com/bug?extid=9db318d6167044609878
Fixes: 665575cff098 ("filemap: move prefaulting out of hot write path")
Cc: stable(a)vger.kernel.org
Signed-off-by: Deepanshu Kartikey <kartikey406(a)gmail.com>
---
fs/ext4/extents.c | 12 ++++++++++--
1 file changed, 10 insertions(+), 2 deletions(-)
diff --git a/fs/ext4/extents.c b/fs/ext4/extents.c
index ca5499e9412b..903578d5f68d 100644
--- a/fs/ext4/extents.c
+++ b/fs/ext4/extents.c
@@ -1708,7 +1708,9 @@ static int ext4_ext_correct_indexes(handle_t *handle, struct inode *inode,
struct ext4_extent *ex;
__le32 border;
int k, err = 0;
-
+ if (!path || depth < 0 || depth > EXT4_MAX_EXTENT_DEPTH) {
+ return -EFSCORRUPTED;
+ }
eh = path[depth].p_hdr;
ex = path[depth].p_ext;
@@ -4200,6 +4202,7 @@ int ext4_ext_map_blocks(handle_t *handle, struct inode *inode,
unsigned int allocated_clusters = 0;
struct ext4_allocation_request ar;
ext4_lblk_t cluster_offset;
+ struct ext4_extent_header *eh;
ext_debug(inode, "blocks %u/%u requested\n", map->m_lblk, map->m_len);
trace_ext4_ext_map_blocks_enter(inode, map->m_lblk, map->m_len, flags);
@@ -4212,7 +4215,12 @@ int ext4_ext_map_blocks(handle_t *handle, struct inode *inode,
}
depth = ext_depth(inode);
-
+ eh = path[depth].p_hdr;
+ if (!eh || le16_to_cpu(eh->eh_magic) != EXT4_EXT_MAGIC) {
+ EXT4_ERROR_INODE(inode, "invalid extent header after find_extent");
+ err = -EFSCORRUPTED;
+ goto out;
+ }
/*
* consistent leaf must not be empty;
* this situation is possible, though, _during_ tree modification;
--
2.43.0
The patch titled
Subject: mm/damon/vaddr: do not repeat pte_offset_map_lock() until success
has been added to the -mm mm-hotfixes-unstable branch. Its filename is
mm-damon-vaddr-do-not-repeat-pte_offset_map_lock-until-success.patch
This patch will shortly appear at
https://git.kernel.org/pub/scm/linux/kernel/git/akpm/25-new.git/tree/patche…
This patch will later appear in the mm-hotfixes-unstable branch at
git://git.kernel.org/pub/scm/linux/kernel/git/akpm/mm
Before you just go and hit "reply", please:
a) Consider who else should be cc'ed
b) Prefer to cc a suitable mailing list as well
c) Ideally: find the original patch on the mailing list and do a
reply-to-all to that, adding suitable additional cc's
*** Remember to use Documentation/process/submit-checklist.rst when testing your code ***
The -mm tree is included into linux-next via the mm-everything
branch at git://git.kernel.org/pub/scm/linux/kernel/git/akpm/mm
and is updated there every 2-3 working days
------------------------------------------------------
From: SeongJae Park <sj(a)kernel.org>
Subject: mm/damon/vaddr: do not repeat pte_offset_map_lock() until success
Date: Mon, 29 Sep 2025 17:44:09 -0700
DAMON's virtual address space operation set implementation (vaddr) calls
pte_offset_map_lock() inside the page table walk callback function. This
is for reading and writing page table accessed bits. If
pte_offset_map_lock() fails, it retries by returning the page table walk
callback function with ACTION_AGAIN.
pte_offset_map_lock() can continuously fail if the target is a pmd
migration entry, though. Hence it could cause an infinite page table walk
if the migration cannot be done until the page table walk is finished.
This indeed caused a soft lockup when CPU hotplugging and DAMON were
running in parallel.
Avoid the infinite loop by simply not retrying the page table walk. DAMON
is promising only a best-effort accuracy, so missing access to such pages
is no problem.
Link: https://lkml.kernel.org/r/20250930004410.55228-1-sj@kernel.org
Fixes: 7780d04046a2 ("mm/pagewalkers: ACTION_AGAIN if pte_offset_map_lock() fails")
Signed-off-by: SeongJae Park <sj(a)kernel.org>
Reported-by: Xinyu Zheng <zhengxinyu6(a)huawei.com>
Closes: https://lore.kernel.org/20250918030029.2652607-1-zhengxinyu6@huawei.com
Acked-by: Hugh Dickins <hughd(a)google.com>
Cc: <stable(a)vger.kernel.org> [6.5+]
Signed-off-by: Andrew Morton <akpm(a)linux-foundation.org>
---
mm/damon/vaddr.c | 8 ++------
1 file changed, 2 insertions(+), 6 deletions(-)
--- a/mm/damon/vaddr.c~mm-damon-vaddr-do-not-repeat-pte_offset_map_lock-until-success
+++ a/mm/damon/vaddr.c
@@ -328,10 +328,8 @@ static int damon_mkold_pmd_entry(pmd_t *
}
pte = pte_offset_map_lock(walk->mm, pmd, addr, &ptl);
- if (!pte) {
- walk->action = ACTION_AGAIN;
+ if (!pte)
return 0;
- }
if (!pte_present(ptep_get(pte)))
goto out;
damon_ptep_mkold(pte, walk->vma, addr);
@@ -481,10 +479,8 @@ regular_page:
#endif /* CONFIG_TRANSPARENT_HUGEPAGE */
pte = pte_offset_map_lock(walk->mm, pmd, addr, &ptl);
- if (!pte) {
- walk->action = ACTION_AGAIN;
+ if (!pte)
return 0;
- }
ptent = ptep_get(pte);
if (!pte_present(ptent))
goto out;
_
Patches currently in -mm which might be from sj(a)kernel.org are
mm-damon-vaddr-do-not-repeat-pte_offset_map_lock-until-success.patch
The patch titled
Subject: mm/rmap: fix soft-dirty and uffd-wp bit loss when remapping zero-filled mTHP subpage to shared zeropage
has been added to the -mm mm-hotfixes-unstable branch. Its filename is
mm-rmap-fix-soft-dirty-and-uffd-wp-bit-loss-when-remapping-zero-filled-mthp-subpage-to-shared-zeropage.patch
This patch will shortly appear at
https://git.kernel.org/pub/scm/linux/kernel/git/akpm/25-new.git/tree/patche…
This patch will later appear in the mm-hotfixes-unstable branch at
git://git.kernel.org/pub/scm/linux/kernel/git/akpm/mm
Before you just go and hit "reply", please:
a) Consider who else should be cc'ed
b) Prefer to cc a suitable mailing list as well
c) Ideally: find the original patch on the mailing list and do a
reply-to-all to that, adding suitable additional cc's
*** Remember to use Documentation/process/submit-checklist.rst when testing your code ***
The -mm tree is included into linux-next via the mm-everything
branch at git://git.kernel.org/pub/scm/linux/kernel/git/akpm/mm
and is updated there every 2-3 working days
------------------------------------------------------
From: Lance Yang <lance.yang(a)linux.dev>
Subject: mm/rmap: fix soft-dirty and uffd-wp bit loss when remapping zero-filled mTHP subpage to shared zeropage
Date: Tue, 30 Sep 2025 16:10:40 +0800
When splitting an mTHP and replacing a zero-filled subpage with the shared
zeropage, try_to_map_unused_to_zeropage() currently drops several
important PTE bits.
For userspace tools like CRIU, which rely on the soft-dirty mechanism for
incremental snapshots, losing the soft-dirty bit means modified pages are
missed, leading to inconsistent memory state after restore.
As pointed out by David, the more critical uffd-wp bit is also dropped.
This breaks the userfaultfd write-protection mechanism, causing writes to
be silently missed by monitoring applications, which can lead to data
corruption.
Preserve both the soft-dirty and uffd-wp bits from the old PTE when
creating the new zeropage mapping to ensure they are correctly tracked.
Link: https://lkml.kernel.org/r/20250930081040.80926-1-lance.yang@linux.dev
Fixes: b1f202060afe ("mm: remap unused subpages to shared zeropage when splitting isolated thp")
Signed-off-by: Lance Yang <lance.yang(a)linux.dev>
Suggested-by: David Hildenbrand <david(a)redhat.com>
Suggested-by: Dev Jain <dev.jain(a)arm.com>
Acked-by: David Hildenbrand <david(a)redhat.com>
Reviewed-by: Dev Jain <dev.jain(a)arm.com>
Acked-by: Zi Yan <ziy(a)nvidia.com>
Cc: Alistair Popple <apopple(a)nvidia.com>
Cc: Baolin Wang <baolin.wang(a)linux.alibaba.com>
Cc: Barry Song <baohua(a)kernel.org>
Cc: Byungchul Park <byungchul(a)sk.com>
Cc: Gregory Price <gourry(a)gourry.net>
Cc: "Huang, Ying" <ying.huang(a)linux.alibaba.com>
Cc: Jann Horn <jannh(a)google.com>
Cc: Joshua Hahn <joshua.hahnjy(a)gmail.com>
Cc: Liam Howlett <liam.howlett(a)oracle.com>
Cc: Lorenzo Stoakes <lorenzo.stoakes(a)oracle.com>
Cc: Mariano Pache <npache(a)redhat.com>
Cc: Mathew Brost <matthew.brost(a)intel.com>
Cc: Peter Xu <peterx(a)redhat.com>
Cc: Rakie Kim <rakie.kim(a)sk.com>
Cc: Rik van Riel <riel(a)surriel.com>
Cc: Ryan Roberts <ryan.roberts(a)arm.com>
Cc: Usama Arif <usamaarif642(a)gmail.com>
Cc: Vlastimil Babka <vbabka(a)suse.cz>
Cc: Yu Zhao <yuzhao(a)google.com>
Cc: <stable(a)vger.kernel.org>
Signed-off-by: Andrew Morton <akpm(a)linux-foundation.org>
---
mm/migrate.c | 15 ++++++++++-----
1 file changed, 10 insertions(+), 5 deletions(-)
--- a/mm/migrate.c~mm-rmap-fix-soft-dirty-and-uffd-wp-bit-loss-when-remapping-zero-filled-mthp-subpage-to-shared-zeropage
+++ a/mm/migrate.c
@@ -297,8 +297,7 @@ bool isolate_folio_to_list(struct folio
}
static bool try_to_map_unused_to_zeropage(struct page_vma_mapped_walk *pvmw,
- struct folio *folio,
- unsigned long idx)
+ struct folio *folio, pte_t old_pte, unsigned long idx)
{
struct page *page = folio_page(folio, idx);
pte_t newpte;
@@ -307,7 +306,7 @@ static bool try_to_map_unused_to_zeropag
return false;
VM_BUG_ON_PAGE(!PageAnon(page), page);
VM_BUG_ON_PAGE(!PageLocked(page), page);
- VM_BUG_ON_PAGE(pte_present(ptep_get(pvmw->pte)), page);
+ VM_BUG_ON_PAGE(pte_present(old_pte), page);
if (folio_test_mlocked(folio) || (pvmw->vma->vm_flags & VM_LOCKED) ||
mm_forbids_zeropage(pvmw->vma->vm_mm))
@@ -323,6 +322,12 @@ static bool try_to_map_unused_to_zeropag
newpte = pte_mkspecial(pfn_pte(my_zero_pfn(pvmw->address),
pvmw->vma->vm_page_prot));
+
+ if (pte_swp_soft_dirty(old_pte))
+ newpte = pte_mksoft_dirty(newpte);
+ if (pte_swp_uffd_wp(old_pte))
+ newpte = pte_mkuffd_wp(newpte);
+
set_pte_at(pvmw->vma->vm_mm, pvmw->address, pvmw->pte, newpte);
dec_mm_counter(pvmw->vma->vm_mm, mm_counter(folio));
@@ -365,13 +370,13 @@ static bool remove_migration_pte(struct
continue;
}
#endif
+ old_pte = ptep_get(pvmw.pte);
if (rmap_walk_arg->map_unused_to_zeropage &&
- try_to_map_unused_to_zeropage(&pvmw, folio, idx))
+ try_to_map_unused_to_zeropage(&pvmw, folio, old_pte, idx))
continue;
folio_get(folio);
pte = mk_pte(new, READ_ONCE(vma->vm_page_prot));
- old_pte = ptep_get(pvmw.pte);
entry = pte_to_swp_entry(old_pte);
if (!is_migration_entry_young(entry))
_
Patches currently in -mm which might be from lance.yang(a)linux.dev are
hung_task-fix-warnings-caused-by-unaligned-lock-pointers.patch
mm-thp-fix-mte-tag-mismatch-when-replacing-zero-filled-subpages.patch
mm-rmap-fix-soft-dirty-and-uffd-wp-bit-loss-when-remapping-zero-filled-mthp-subpage-to-shared-zeropage.patch
mm-clean-up-is_guard_pte_marker.patch
#syz test: git://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git master
syzbot reported multiple use-after-free bugs when accessing extent headers
in various ext4 functions. These occur because extent headers can be freed
by concurrent operations while other threads still hold pointers to them.
The issue is triggered by racing threads performing concurrent writes to
the same file. After commit 665575cff098 ("filemap: move prefaulting out
of hot write path"), the write path no longer prefaults pages in the hot
path, creating a wider race window where:
1. Thread A calls ext4_find_extent() and gets a path with extent headers
2. Thread A's write attempt fails, entering the slow path
3. During the gap, Thread B modifies the extent tree, freeing nodes
4. Thread A continues using the now-freed extent headers, causing UAF
Fix this by validating the extent header in ext4_find_extent() before
returning the path. This ensures all callers receive a valid extent path,
fixing the race at a single point rather than adding checks throughout
the codebase.
This addresses crashes in ext4_ext_insert_extent(), ext4_ext_binsearch(),
and potentially other locations that use extent paths.
Reported-by: syzbot+9db318d6167044609878(a)syzkaller.appspotmail.com
Closes: https://syzkaller.appspot.com/bug?extid=9db318d6167044609878
Fixes: 665575cff098 ("filemap: move prefaulting out of hot write path")
Cc: stable(a)vger.kernel.org
Signed-off-by: Deepanshu Kartikey <kartikey406(a)gmail.com>
---
fs/ext4/extents.c | 8 +++++++-
1 file changed, 7 insertions(+), 1 deletion(-)
diff --git a/fs/ext4/extents.c b/fs/ext4/extents.c
index ca5499e9412b..04ceae5b0a34 100644
--- a/fs/ext4/extents.c
+++ b/fs/ext4/extents.c
@@ -4200,6 +4200,7 @@ int ext4_ext_map_blocks(handle_t *handle, struct inode *inode,
unsigned int allocated_clusters = 0;
struct ext4_allocation_request ar;
ext4_lblk_t cluster_offset;
+ struct ext4_extent_header *eh;
ext_debug(inode, "blocks %u/%u requested\n", map->m_lblk, map->m_len);
trace_ext4_ext_map_blocks_enter(inode, map->m_lblk, map->m_len, flags);
@@ -4212,7 +4213,12 @@ int ext4_ext_map_blocks(handle_t *handle, struct inode *inode,
}
depth = ext_depth(inode);
-
+ eh = path[depth].p_hdr;
+ if (!eh || le16_to_cpu(eh->eh_magic) != EXT4_EXT_MAGIC) {
+ EXT4_ERROR_INODE(inode, "invalid extent header after find_extent");
+ err = -EFSCORRUPTED;
+ goto out;
+ }
/*
* consistent leaf must not be empty;
* this situation is possible, though, _during_ tree modification;
--
2.43.0
Hi ,
Hope you're doing well. I wanted to check if my previous email reached you.
Do you need any additional information regarding my previous email? If so, I can provide it for your review.
Regards
Brenda
Marketing Manager
Prospect Tech Connect.,
Please reply with REMOVE if you don't wish to receive further emails
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Hello,o
after upgrading to 6.12.49 my wlan adapter stops working. It is
detected:
kernel: mt76x2u 4-2:1.0: ASIC revision: 76120044
kernel: mt76x2u 4-2:1.0: ROM patch build: 20141115060606a
kernel: usb 3-4: reset high-speed USB device number 2 using xhci_hcd
kernel: mt76x2u 4-2:1.0: Firmware Version: 0.0.00
kernel: mt76x2u 4-2:1.0: Build: 1
kernel: mt76x2u 4-2:1.0: Build Time: 201507311614____
but does nor work. The following 2 messages probably are relevant:
kernel: mt76x2u 4-2:1.0: MAC RX failed to stop
kernel: mt76x2u 4-2:1.0: MAC RX failed to stop
later I see a lot of
kernel: mt76x2u 4-2:1.0: error: mt76x02u_mcu_wait_resp failed with -110
I bisected it down to commit
9b28ef1e4cc07cdb35da257aa4358d0127168b68
usb: xhci: remove option to change a default ring's TRB cycle bit
9b28ef1e4cc07cdb35da257aa4358d0127168b68 is the first bad commit
commit 9b28ef1e4cc07cdb35da257aa4358d0127168b68
Author: Niklas Neronin <niklas.neronin(a)linux.intel.com>
Date: Wed Sep 17 08:39:07 2025 -0400
usb: xhci: remove option to change a default ring's TRB cycle bit
[ Upstream commit e1b0fa863907a61e86acc19ce2d0633941907c8e ]
The TRB cycle bit indicates TRB ownership by the Host Controller
(HC) or
Host Controller Driver (HCD). New rings are initialized with
'cycle_state'
equal to one, and all its TRBs' cycle bits are set to zero. When
handling
ring expansion, set the source ring cycle bits to the same value as
the
destination ring.
Move the cycle bit setting from xhci_segment_alloc() to
xhci_link_rings(),
and remove the 'cycle_state' argument from
xhci_initialize_ring_info().
The xhci_segment_alloc() function uses kzalloc_node() to allocate
segments,
ensuring that all TRB cycle bits are initialized to zero.
Signed-off-by: Niklas Neronin <niklas.neronin(a)linux.intel.com>
Signed-off-by: Mathias Nyman <mathias.nyman(a)linux.intel.com>
Link:
https://lore.kernel.org/r/20241106101459.775897-12-mathias.nyman@linux.inte…
Signed-off-by: Greg Kroah-Hartman <gregkh(a)linuxfoundation.org>
Stable-dep-of: a5c98e8b1398 ("xhci: dbc: Fix full DbC transfer ring
after several reconnects")
Signed-off-by: Sasha Levin <sashal(a)kernel.org>
Signed-off-by: Greg Kroah-Hartman <gregkh(a)linuxfoundation.org>
Regards,
--
Wolfgang Walter
Studierendenwerk München Oberbayern
Anstalt des öffentlichen Rechts
From: Pierre Gondois <pierre.gondois(a)arm.com>
commit 5944ce092b97caed5d86d961e963b883b5c44ee2 upstream.
commit 3fcbf1c77d08 ("arch_topology: Fix cache attributes detection
in the CPU hotplug path")
adds a call to detect_cache_attributes() to populate the cacheinfo
before updating the siblings mask. detect_cache_attributes() allocates
memory and can take the PPTT mutex (on ACPI platforms). On PREEMPT_RT
kernels, on secondary CPUs, this triggers a:
'BUG: sleeping function called from invalid context' [1]
as the code is executed with preemption and interrupts disabled.
The primary CPU was previously storing the cache information using
the now removed (struct cpu_topology).llc_id:
commit 5b8dc787ce4a ("arch_topology: Drop LLC identifier stash from
the CPU topology")
allocate_cache_info() tries to build the cacheinfo from the primary
CPU prior secondary CPUs boot, if the DT/ACPI description
contains cache information.
If allocate_cache_info() fails, then fallback to the current state
for the cacheinfo allocation. [1] will be triggered in such case.
When unplugging a CPU, the cacheinfo memory cannot be freed. If it
was, then the memory would be allocated early by the re-plugged
CPU and would trigger [1].
Note that populate_cache_leaves() might be called multiple times
due to populate_leaves being moved up. This is required since
detect_cache_attributes() might be called with per_cpu_cacheinfo(cpu)
being allocated but not populated.
[1]:
| BUG: sleeping function called from invalid context at kernel/locking/spinlock_rt.c:46
| in_atomic(): 1, irqs_disabled(): 128, non_block: 0, pid: 0, name: swapper/111
| preempt_count: 1, expected: 0
| RCU nest depth: 1, expected: 1
| 3 locks held by swapper/111/0:
| #0: (&pcp->lock){+.+.}-{3:3}, at: get_page_from_freelist+0x218/0x12c8
| #1: (rcu_read_lock){....}-{1:3}, at: rt_spin_trylock+0x48/0xf0
| #2: (&zone->lock){+.+.}-{3:3}, at: rmqueue_bulk+0x64/0xa80
| irq event stamp: 0
| hardirqs last enabled at (0): 0x0
| hardirqs last disabled at (0): copy_process+0x5dc/0x1ab8
| softirqs last enabled at (0): copy_process+0x5dc/0x1ab8
| softirqs last disabled at (0): 0x0
| Preemption disabled at:
| migrate_enable+0x30/0x130
| CPU: 111 PID: 0 Comm: swapper/111 Tainted: G W 6.0.0-rc4-rt6-[...]
| Call trace:
| __kmalloc+0xbc/0x1e8
| detect_cache_attributes+0x2d4/0x5f0
| update_siblings_masks+0x30/0x368
| store_cpu_topology+0x78/0xb8
| secondary_start_kernel+0xd0/0x198
| __secondary_switched+0xb0/0xb4
Signed-off-by: Pierre Gondois <pierre.gondois(a)arm.com>
Reviewed-by: Sudeep Holla <sudeep.holla(a)arm.com>
Acked-by: Palmer Dabbelt <palmer(a)rivosinc.com>
Link: https://lore.kernel.org/r/20230104183033.755668-7-pierre.gondois@arm.com
Signed-off-by: Sudeep Holla <sudeep.holla(a)arm.com>
Cc: <stable(a)vger.kernel.org> # 6.1.x: c3719bd:cacheinfo: Use RISC-V's init_cache_level() as generic OF implementation
Cc: <stable(a)vger.kernel.org> # 6.1.x: 8844c3d:cacheinfo: Return error code in init_of_cache_level(
Cc: <stable(a)vger.kernel.org> # 6.1.x: de0df44:cacheinfo: Check 'cache-unified' property to count cache leaves
Cc: <stable(a)vger.kernel.org> # 6.1.x: fa4d566:ACPI: PPTT: Remove acpi_find_cache_levels()
Cc: <stable(a)vger.kernel.org> # 6.1.x: bd50036:ACPI: PPTT: Update acpi_find_last_cache_level() to acpi_get_cache_info(
Cc: <stable(a)vger.kernel.org> # 6.1.x
Signed-off-by: Wen Yang <wen.yang(a)linux.dev>
---
arch/riscv/kernel/cacheinfo.c | 5 ---
drivers/base/arch_topology.c | 12 +++++-
drivers/base/cacheinfo.c | 71 ++++++++++++++++++++++++++---------
include/linux/cacheinfo.h | 1 +
4 files changed, 65 insertions(+), 24 deletions(-)
diff --git a/arch/riscv/kernel/cacheinfo.c b/arch/riscv/kernel/cacheinfo.c
index 440a3df5944c..3a13113f1b29 100644
--- a/arch/riscv/kernel/cacheinfo.c
+++ b/arch/riscv/kernel/cacheinfo.c
@@ -113,11 +113,6 @@ static void fill_cacheinfo(struct cacheinfo **this_leaf,
}
}
-int init_cache_level(unsigned int cpu)
-{
- return init_of_cache_level(cpu);
-}
-
int populate_cache_leaves(unsigned int cpu)
{
struct cpu_cacheinfo *this_cpu_ci = get_cpu_cacheinfo(cpu);
diff --git a/drivers/base/arch_topology.c b/drivers/base/arch_topology.c
index e7d6e6657ffa..b1c1dd38ab01 100644
--- a/drivers/base/arch_topology.c
+++ b/drivers/base/arch_topology.c
@@ -736,7 +736,7 @@ void update_siblings_masks(unsigned int cpuid)
ret = detect_cache_attributes(cpuid);
if (ret && ret != -ENOENT)
- pr_info("Early cacheinfo failed, ret = %d\n", ret);
+ pr_info("Early cacheinfo allocation failed, ret = %d\n", ret);
/* update core and thread sibling masks */
for_each_online_cpu(cpu) {
@@ -825,7 +825,7 @@ __weak int __init parse_acpi_topology(void)
#if defined(CONFIG_ARM64) || defined(CONFIG_RISCV)
void __init init_cpu_topology(void)
{
- int ret;
+ int cpu, ret;
reset_cpu_topology();
ret = parse_acpi_topology();
@@ -840,6 +840,14 @@ void __init init_cpu_topology(void)
reset_cpu_topology();
return;
}
+
+ for_each_possible_cpu(cpu) {
+ ret = fetch_cache_info(cpu);
+ if (ret) {
+ pr_err("Early cacheinfo failed, ret = %d\n", ret);
+ break;
+ }
+ }
}
void store_cpu_topology(unsigned int cpuid)
diff --git a/drivers/base/cacheinfo.c b/drivers/base/cacheinfo.c
index ab99b0f0d010..cd943d06d074 100644
--- a/drivers/base/cacheinfo.c
+++ b/drivers/base/cacheinfo.c
@@ -412,10 +412,6 @@ static void free_cache_attributes(unsigned int cpu)
return;
cache_shared_cpu_map_remove(cpu);
-
- kfree(per_cpu_cacheinfo(cpu));
- per_cpu_cacheinfo(cpu) = NULL;
- cache_leaves(cpu) = 0;
}
int __weak init_cache_level(unsigned int cpu)
@@ -428,29 +424,71 @@ int __weak populate_cache_leaves(unsigned int cpu)
return -ENOENT;
}
+static inline
+int allocate_cache_info(int cpu)
+{
+ per_cpu_cacheinfo(cpu) = kcalloc(cache_leaves(cpu),
+ sizeof(struct cacheinfo), GFP_ATOMIC);
+ if (!per_cpu_cacheinfo(cpu)) {
+ cache_leaves(cpu) = 0;
+ return -ENOMEM;
+ }
+
+ return 0;
+}
+
+int fetch_cache_info(unsigned int cpu)
+{
+ struct cpu_cacheinfo *this_cpu_ci;
+ unsigned int levels, split_levels;
+ int ret;
+
+ if (acpi_disabled) {
+ ret = init_of_cache_level(cpu);
+ if (ret < 0)
+ return ret;
+ } else {
+ ret = acpi_get_cache_info(cpu, &levels, &split_levels);
+ if (ret < 0)
+ return ret;
+
+ this_cpu_ci = get_cpu_cacheinfo(cpu);
+ this_cpu_ci->num_levels = levels;
+ /*
+ * This assumes that:
+ * - there cannot be any split caches (data/instruction)
+ * above a unified cache
+ * - data/instruction caches come by pair
+ */
+ this_cpu_ci->num_leaves = levels + split_levels;
+ }
+ if (!cache_leaves(cpu))
+ return -ENOENT;
+
+ return allocate_cache_info(cpu);
+}
+
int detect_cache_attributes(unsigned int cpu)
{
int ret;
- /* Since early detection of the cacheinfo is allowed via this
- * function and this also gets called as CPU hotplug callbacks via
- * cacheinfo_cpu_online, the initialisation can be skipped and only
- * CPU maps can be updated as the CPU online status would be update
- * if called via cacheinfo_cpu_online path.
+ /* Since early initialization/allocation of the cacheinfo is allowed
+ * via fetch_cache_info() and this also gets called as CPU hotplug
+ * callbacks via cacheinfo_cpu_online, the init/alloc can be skipped
+ * as it will happen only once (the cacheinfo memory is never freed).
+ * Just populate the cacheinfo.
*/
if (per_cpu_cacheinfo(cpu))
- goto update_cpu_map;
+ goto populate_leaves;
if (init_cache_level(cpu) || !cache_leaves(cpu))
return -ENOENT;
- per_cpu_cacheinfo(cpu) = kcalloc(cache_leaves(cpu),
- sizeof(struct cacheinfo), GFP_ATOMIC);
- if (per_cpu_cacheinfo(cpu) == NULL) {
- cache_leaves(cpu) = 0;
- return -ENOMEM;
- }
+ ret = allocate_cache_info(cpu);
+ if (ret)
+ return ret;
+populate_leaves:
/*
* populate_cache_leaves() may completely setup the cache leaves and
* shared_cpu_map or it may leave it partially setup.
@@ -459,7 +497,6 @@ int detect_cache_attributes(unsigned int cpu)
if (ret)
goto free_ci;
-update_cpu_map:
/*
* For systems using DT for cache hierarchy, fw_token
* and shared_cpu_map will be set up here only if they are
diff --git a/include/linux/cacheinfo.h b/include/linux/cacheinfo.h
index 00d8e7f9d1c6..dfef57077cd0 100644
--- a/include/linux/cacheinfo.h
+++ b/include/linux/cacheinfo.h
@@ -85,6 +85,7 @@ int populate_cache_leaves(unsigned int cpu);
int cache_setup_acpi(unsigned int cpu);
bool last_level_cache_is_valid(unsigned int cpu);
bool last_level_cache_is_shared(unsigned int cpu_x, unsigned int cpu_y);
+int fetch_cache_info(unsigned int cpu);
int detect_cache_attributes(unsigned int cpu);
#ifndef CONFIG_ACPI_PPTT
/*
--
2.25.1
This issue was found by Runcheng Lu when develop HSCanT USB to CAN FD
converter[1]. The original developers may have only 3 interfaces device to
test so they write 3 here and wait for future change.
During the HSCanT development, we actually used 4 interfaces, so the
limitation of 3 is not enough now. But just increase one is not
future-proofed. Since the channel index type in gs_host_frame is u8, just
make canch[] become a flexible array with a u8 index, so it naturally
constraint by U8_MAX and avoid statically allocate 256 pointer for
every gs_usb device.
[1]: https://github.com/cherry-embedded/HSCanT-hardware
Fixes: d08e973a77d1 ("can: gs_usb: Added support for the GS_USB CAN devices")
Reported-by: Runcheng Lu <runcheng.lu(a)hpmicro.com>
Cc: stable(a)vger.kernel.org
Reviewed-by: Vincent Mailhol <mailhol(a)kernel.org>
Signed-off-by: Celeste Liu <uwu(a)coelacanthus.name>
---
Changes in v5:
- Reword commit message to match the code better.
- Link to v4: https://lore.kernel.org/r/20250930-gs-usb-max-if-v4-1-8e163eb583da@coelacan…
Changes in v4:
- Remove redudant typeof().
- Fix type: inteface -> interface.
- Link to v3: https://lore.kernel.org/r/20250930-gs-usb-max-if-v3-1-21d97d7f1c34@coelacan…
Changes in v3:
- Cc stable should in patch instead of cover letter.
- Link to v2: https://lore.kernel.org/r/20250930-gs-usb-max-if-v2-1-2cf9a44e6861@coelacan…
Changes in v2:
- Use flexible array member instead of fixed array.
- Link to v1: https://lore.kernel.org/r/20250929-gs-usb-max-if-v1-1-e41b5c09133a@coelacan…
---
drivers/net/can/usb/gs_usb.c | 22 ++++++++++------------
1 file changed, 10 insertions(+), 12 deletions(-)
diff --git a/drivers/net/can/usb/gs_usb.c b/drivers/net/can/usb/gs_usb.c
index c9482d6e947b0c7b033dc4f0c35f5b111e1bfd92..9fb4cbbd6d6dc88f433020eb0417ea53cd0c4d5f 100644
--- a/drivers/net/can/usb/gs_usb.c
+++ b/drivers/net/can/usb/gs_usb.c
@@ -289,11 +289,6 @@ struct gs_host_frame {
#define GS_MAX_RX_URBS 30
#define GS_NAPI_WEIGHT 32
-/* Maximum number of interfaces the driver supports per device.
- * Current hardware only supports 3 interfaces. The future may vary.
- */
-#define GS_MAX_INTF 3
-
struct gs_tx_context {
struct gs_can *dev;
unsigned int echo_id;
@@ -324,7 +319,6 @@ struct gs_can {
/* usb interface struct */
struct gs_usb {
- struct gs_can *canch[GS_MAX_INTF];
struct usb_anchor rx_submitted;
struct usb_device *udev;
@@ -336,9 +330,11 @@ struct gs_usb {
unsigned int hf_size_rx;
u8 active_channels;
+ u8 channel_cnt;
unsigned int pipe_in;
unsigned int pipe_out;
+ struct gs_can *canch[] __counted_by(channel_cnt);
};
/* 'allocate' a tx context.
@@ -599,7 +595,7 @@ static void gs_usb_receive_bulk_callback(struct urb *urb)
}
/* device reports out of range channel id */
- if (hf->channel >= GS_MAX_INTF)
+ if (hf->channel >= parent->channel_cnt)
goto device_detach;
dev = parent->canch[hf->channel];
@@ -699,7 +695,7 @@ static void gs_usb_receive_bulk_callback(struct urb *urb)
/* USB failure take down all interfaces */
if (rc == -ENODEV) {
device_detach:
- for (rc = 0; rc < GS_MAX_INTF; rc++) {
+ for (rc = 0; rc < parent->channel_cnt; rc++) {
if (parent->canch[rc])
netif_device_detach(parent->canch[rc]->netdev);
}
@@ -1460,17 +1456,19 @@ static int gs_usb_probe(struct usb_interface *intf,
icount = dconf.icount + 1;
dev_info(&intf->dev, "Configuring for %u interfaces\n", icount);
- if (icount > GS_MAX_INTF) {
+ if (icount > type_max(parent->channel_cnt)) {
dev_err(&intf->dev,
"Driver cannot handle more that %u CAN interfaces\n",
- GS_MAX_INTF);
+ type_max(parent->channel_cnt));
return -EINVAL;
}
- parent = kzalloc(sizeof(*parent), GFP_KERNEL);
+ parent = kzalloc(struct_size(parent, canch, icount), GFP_KERNEL);
if (!parent)
return -ENOMEM;
+ parent->channel_cnt = icount;
+
init_usb_anchor(&parent->rx_submitted);
usb_set_intfdata(intf, parent);
@@ -1531,7 +1529,7 @@ static void gs_usb_disconnect(struct usb_interface *intf)
return;
}
- for (i = 0; i < GS_MAX_INTF; i++)
+ for (i = 0; i < parent->channel_cnt; i++)
if (parent->canch[i])
gs_destroy_candev(parent->canch[i]);
---
base-commit: e5f0a698b34ed76002dc5cff3804a61c80233a7a
change-id: 20250929-gs-usb-max-if-a304c83243e5
Best regards,
--
Celeste Liu <uwu(a)coelacanthus.name>
The gs_usb driver supports USB devices with more than 1 CAN channel. In
old kernel before 3.15, it uses net_device->dev_id to distinguish
different channel in userspace, which was done in commit
acff76fa45b4 ("can: gs_usb: gs_make_candev(): set netdev->dev_id").
But since 3.15, the correct way is populating net_device->dev_port. And
according to documentation, if network device support multiple interface,
lack of net_device->dev_port SHALL be treated as a bug.
Fixes: acff76fa45b4 ("can: gs_usb: gs_make_candev(): set netdev->dev_id")
Cc: stable(a)vger.kernel.org
Signed-off-by: Celeste Liu <uwu(a)coelacanthus.name>
---
drivers/net/can/usb/gs_usb.c | 1 +
1 file changed, 1 insertion(+)
diff --git a/drivers/net/can/usb/gs_usb.c b/drivers/net/can/usb/gs_usb.c
index c9482d6e947b0c7b033dc4f0c35f5b111e1bfd92..7ee68b47b569a142ffed3981edcaa9a1943ef0c2 100644
--- a/drivers/net/can/usb/gs_usb.c
+++ b/drivers/net/can/usb/gs_usb.c
@@ -1249,6 +1249,7 @@ static struct gs_can *gs_make_candev(unsigned int channel,
netdev->flags |= IFF_ECHO; /* we support full roundtrip echo */
netdev->dev_id = channel;
+ netdev->dev_port = channel;
/* dev setup */
strcpy(dev->bt_const.name, KBUILD_MODNAME);
---
base-commit: 30d4efb2f5a515a60fe6b0ca85362cbebea21e2f
change-id: 20250930-gs-usb-populate-net_device-dev_port-941f2d1c3889
Best regards,
--
Celeste Liu <uwu(a)coelacanthus.name>
This series backports 13 patches to update minmax.h in the 6.1.y branch,
aligning it with v6.17-rc7.
The ultimate goal is to synchronize all longterm branches so that they
include the full set of minmax.h changes (6.12.y was already aligned and
6.6.y is in progress).
The key motivation is to bring in commit d03eba99f5bf ("minmax: allow
min()/max()/clamp() if the arguments have the same signedness"), which
is missing in older kernels.
In mainline, this change enables min()/max()/clamp() to accept mixed
argument types, provided both have the same signedness. Without it,
backported patches that use these forms may trigger compiler warnings,
which escalate to build failures when -Werror is enabled.
Changes between v1 and v2:
- v1 included 19 patches:
https://lore.kernel.org/stable/20250924202320.32333-1-farbere@amazon.com/
- First 6 were pushed to the stable-tree.
- 7th cauded amd driver's build to fail.
- This change fixes it.
- Modified files:
drivers/gpu/drm/amd/amdgpu/amdgpu.h
drivers/gpu/drm/amd/pm/swsmu/smu11/sienna_cichlid_ppt.c
drivers/gpu/drm/amd/pm/swsmu/smu13/smu_v13_0_0_ppt.c
drivers/gpu/drm/amd/pm/swsmu/smu13/smu_v13_0_7_ppt.c
David Laight (7):
minmax.h: add whitespace around operators and after commas
minmax.h: update some comments
minmax.h: reduce the #define expansion of min(), max() and clamp()
minmax.h: use BUILD_BUG_ON_MSG() for the lo < hi test in clamp()
minmax.h: move all the clamp() definitions after the min/max() ones
minmax.h: simplify the variants of clamp()
minmax.h: remove some #defines that are only expanded once
Linus Torvalds (6):
minmax: make generic MIN() and MAX() macros available everywhere
minmax: add a few more MIN_T/MAX_T users
minmax: simplify min()/max()/clamp() implementation
minmax: don't use max() in situations that want a C constant
expression
minmax: improve macro expansion and type checking
minmax: fix up min3() and max3() too
arch/um/drivers/mconsole_user.c | 2 +
arch/x86/mm/pgtable.c | 2 +-
drivers/edac/sb_edac.c | 4 +-
drivers/edac/skx_common.h | 1 -
drivers/gpu/drm/amd/amdgpu/amdgpu.h | 2 +
.../drm/amd/display/modules/hdcp/hdcp_ddc.c | 2 +
.../drm/amd/pm/powerplay/hwmgr/ppevvmath.h | 14 +-
.../amd/pm/swsmu/smu11/sienna_cichlid_ppt.c | 2 +
.../drm/amd/pm/swsmu/smu13/smu_v13_0_0_ppt.c | 3 +
.../drm/amd/pm/swsmu/smu13/smu_v13_0_7_ppt.c | 3 +
drivers/gpu/drm/amd/pm/swsmu/smu_cmn.c | 2 +-
drivers/gpu/drm/drm_color_mgmt.c | 2 +-
drivers/gpu/drm/radeon/evergreen_cs.c | 2 +
drivers/hwmon/adt7475.c | 24 +-
drivers/input/touchscreen/cyttsp4_core.c | 2 +-
drivers/irqchip/irq-sun6i-r.c | 2 +-
drivers/md/dm-integrity.c | 2 +-
drivers/media/dvb-frontends/stv0367_priv.h | 3 +
.../net/ethernet/stmicro/stmmac/stmmac_main.c | 2 +-
drivers/net/fjes/fjes_main.c | 4 +-
drivers/nfc/pn544/i2c.c | 2 -
drivers/platform/x86/sony-laptop.c | 1 -
drivers/scsi/isci/init.c | 6 +-
.../pci/hive_isp_css_include/math_support.h | 5 -
fs/btrfs/tree-checker.c | 2 +-
include/linux/compiler.h | 9 +
include/linux/minmax.h | 220 ++++++++++--------
kernel/trace/preemptirq_delay_test.c | 2 -
lib/btree.c | 1 -
lib/decompress_unlzma.c | 2 +
lib/vsprintf.c | 2 +-
mm/zsmalloc.c | 1 -
net/ipv4/proc.c | 2 +-
net/ipv6/proc.c | 2 +-
tools/testing/selftests/seccomp/seccomp_bpf.c | 2 +
tools/testing/selftests/vm/mremap_test.c | 2 +
36 files changed, 199 insertions(+), 142 deletions(-)
--
2.47.3
This series backports 15 patches to update minmax.h in the 6.6.y branch,
aligning it with v6.17-rc7.
The ultimate goal is to synchronize all longterm branches so that they
include the full set of minmax.h changes.
The key motivation is to bring in commit d03eba99f5bf ("minmax: allow
min()/max()/clamp() if the arguments have the same signedness"), which
is missing in older kernels.
In mainline, this change enables min()/max()/clamp() to accept mixed
argument types, provided both have the same signedness. Without it,
backported patches that use these forms may trigger compiler warnings,
which escalate to build failures when -Werror is enabled.
Changes between v1 and v2:
- v1 included 15 patches:
https://lore.kernel.org/stable/20250922103241.16213-1-farbere@amazon.com/T/…
- First 3 were pushed to the stable-tree.
- 4th cauded amd driver's build to fail.
- This change fixes it.
- Modified files:
drivers/gpu/drm/amd/amdgpu/amdgpu.h
drivers/gpu/drm/amd/pm/swsmu/smu11/sienna_cichlid_ppt.c
drivers/gpu/drm/amd/pm/swsmu/smu13/smu_v13_0_0_ppt.c
drivers/gpu/drm/amd/pm/swsmu/smu13/smu_v13_0_7_ppt.c
David Laight (7):
minmax.h: add whitespace around operators and after commas
minmax.h: update some comments
minmax.h: reduce the #define expansion of min(), max() and clamp()
minmax.h: use BUILD_BUG_ON_MSG() for the lo < hi test in clamp()
minmax.h: move all the clamp() definitions after the min/max() ones
minmax.h: simplify the variants of clamp()
minmax.h: remove some #defines that are only expanded once
Linus Torvalds (5):
minmax: make generic MIN() and MAX() macros available everywhere
minmax: simplify min()/max()/clamp() implementation
minmax: don't use max() in situations that want a C constant
expression
minmax: improve macro expansion and type checking
minmax: fix up min3() and max3() too
arch/um/drivers/mconsole_user.c | 2 +
drivers/edac/skx_common.h | 1 -
drivers/gpu/drm/amd/amdgpu/amdgpu.h | 2 +
.../drm/amd/display/modules/hdcp/hdcp_ddc.c | 2 +
.../drm/amd/pm/powerplay/hwmgr/ppevvmath.h | 14 +-
.../amd/pm/swsmu/smu11/sienna_cichlid_ppt.c | 2 +
.../drm/amd/pm/swsmu/smu13/smu_v13_0_0_ppt.c | 3 +
.../drm/amd/pm/swsmu/smu13/smu_v13_0_7_ppt.c | 3 +
drivers/gpu/drm/amd/pm/swsmu/smu_cmn.c | 2 +-
drivers/gpu/drm/radeon/evergreen_cs.c | 2 +
drivers/hwmon/adt7475.c | 24 +-
drivers/input/touchscreen/cyttsp4_core.c | 2 +-
drivers/irqchip/irq-sun6i-r.c | 2 +-
drivers/media/dvb-frontends/stv0367_priv.h | 3 +
.../net/can/usb/etas_es58x/es58x_devlink.c | 2 +-
drivers/net/fjes/fjes_main.c | 4 +-
drivers/nfc/pn544/i2c.c | 2 -
drivers/platform/x86/sony-laptop.c | 1 -
drivers/scsi/isci/init.c | 6 +-
.../pci/hive_isp_css_include/math_support.h | 5 -
fs/btrfs/tree-checker.c | 2 +-
include/linux/compiler.h | 9 +
include/linux/minmax.h | 220 ++++++++++--------
kernel/trace/preemptirq_delay_test.c | 2 -
lib/btree.c | 1 -
lib/decompress_unlzma.c | 2 +
lib/vsprintf.c | 2 +-
mm/zsmalloc.c | 2 -
tools/testing/selftests/mm/mremap_test.c | 2 +
tools/testing/selftests/seccomp/seccomp_bpf.c | 2 +
30 files changed, 192 insertions(+), 136 deletions(-)
--
2.47.3
syzkaller discovered the following crash: (kernel BUG)
[ 44.607039] ------------[ cut here ]------------
[ 44.607422] kernel BUG at mm/userfaultfd.c:2067!
[ 44.608148] Oops: invalid opcode: 0000 [#1] SMP DEBUG_PAGEALLOC KASAN NOPTI
[ 44.608814] CPU: 1 UID: 0 PID: 2475 Comm: reproducer Not tainted 6.16.0-rc6 #1 PREEMPT(none)
[ 44.609635] Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS rel-1.16.3-0-ga6ed6b701f0a-prebuilt.qemu.org 04/01/2014
[ 44.610695] RIP: 0010:userfaultfd_release_all+0x3a8/0x460
<snip other registers, drop unreliable trace>
[ 44.617726] Call Trace:
[ 44.617926] <TASK>
[ 44.619284] userfaultfd_release+0xef/0x1b0
[ 44.620976] __fput+0x3f9/0xb60
[ 44.621240] fput_close_sync+0x110/0x210
[ 44.622222] __x64_sys_close+0x8f/0x120
[ 44.622530] do_syscall_64+0x5b/0x2f0
[ 44.622840] entry_SYSCALL_64_after_hwframe+0x76/0x7e
[ 44.623244] RIP: 0033:0x7f365bb3f227
Kernel panics because it detects UFFD inconsistency during
userfaultfd_release_all(). Specifically, a VMA which has a valid pointer
to vma->vm_userfaultfd_ctx, but no UFFD flags in vma->vm_flags.
The inconsistency is caused in ksm_madvise(): when user calls madvise()
with MADV_UNMEARGEABLE on a VMA that is registered for UFFD in MINOR
mode, it accidentally clears all flags stored in the upper 32 bits of
vma->vm_flags.
Assuming x86_64 kernel build, unsigned long is 64-bit and unsigned int
and int are 32-bit wide. This setup causes the following mishap during
the &= ~VM_MERGEABLE assignment.
VM_MERGEABLE is a 32-bit constant of type unsigned int, 0x8000'0000.
After ~ is applied, it becomes 0x7fff'ffff unsigned int, which is then
promoted to unsigned long before the & operation. This promotion fills
upper 32 bits with leading 0s, as we're doing unsigned conversion (and
even for a signed conversion, this wouldn't help as the leading bit is
0). & operation thus ends up AND-ing vm_flags with 0x0000'0000'7fff'ffff
instead of intended 0xffff'ffff'7fff'ffff and hence accidentally clears
the upper 32-bits of its value.
Fix it by casting `VM_MERGEABLE` constant to unsigned long to preserve
the upper 32 bits, in case it's needed.
Note: other VM_* flags are not affected:
This only happens to the VM_MERGEABLE flag, as the other VM_* flags are
all constants of type int and after ~ operation, they end up with
leading 1 and are thus converted to unsigned long with leading 1s.
Note 2:
After commit 31defc3b01d9 ("userfaultfd: remove (VM_)BUG_ON()s"), this is
no longer a kernel BUG, but a WARNING at the same place:
[ 45.595973] WARNING: CPU: 1 PID: 2474 at mm/userfaultfd.c:2067
but the root-cause (flag-drop) remains the same.
Fixes: 7677f7fd8be76 ("userfaultfd: add minor fault registration mode")
Signed-off-by: Jakub Acs <acsjakub(a)amazon.de>
Cc: Andrew Morton <akpm(a)linux-foundation.org>
Cc: David Hildenbrand <david(a)redhat.com>
Cc: Xu Xin <xu.xin16(a)zte.com.cn>
Cc: Chengming Zhou <chengming.zhou(a)linux.dev>
Cc: Peter Xu <peterx(a)redhat.com>
Cc: Axel Rasmussen <axelrasmussen(a)google.com>
Cc: Mike Kravetz <mike.kravetz(a)oracle.com>
Cc: linux-mm(a)kvack.org
Cc: linux-kernel(a)vger.kernel.org
Cc: stable(a)vger.kernel.org
---
I looked around the kernel and found one more flag that might be
causing similar issues: "IORESOURCE_BUSY" - as its inverted version is
bit-anded to unsigned long fields. However, it seems those fields don't
actually use any bits from upper 32-bits as flags (yet?).
I also considered changing the constant definition by adding ULL, but am
not sure where else that could blow up, plus it would likely call to
define all the related constants as ULL for consistency. If you'd prefer
that fix, let me know.
mm/ksm.c | 2 +-
1 file changed, 1 insertion(+), 1 deletion(-)
diff --git a/mm/ksm.c b/mm/ksm.c
index 160787bb121c..c24137a1eeb7 100644
--- a/mm/ksm.c
+++ b/mm/ksm.c
@@ -2871,7 +2871,7 @@ int ksm_madvise(struct vm_area_struct *vma, unsigned long start,
return err;
}
- *vm_flags &= ~VM_MERGEABLE;
+ *vm_flags &= ~((unsigned long) VM_MERGEABLE);
break;
}
--
2.47.3
Amazon Web Services Development Center Germany GmbH
Tamara-Danz-Str. 13
10243 Berlin
Geschaeftsfuehrung: Christian Schlaeger
Eingetragen am Amtsgericht Charlottenburg unter HRB 257764 B
Sitz: Berlin
Ust-ID: DE 365 538 597
This issue was found by Runcheng Lu when develop HSCanT USB to CAN FD
converter[1]. The original developers may have only 3 interfaces device to
test so they write 3 here and wait for future change.
During the HSCanT development, we actually used 4 interfaces, so the
limitation of 3 is not enough now. But just increase one is not
future-proofed. Since the channel type in gs_host_frame is u8, just
increase interface number limit to max size of u8 safely.
[1]: https://github.com/cherry-embedded/HSCanT-hardware
Fixes: d08e973a77d1 ("can: gs_usb: Added support for the GS_USB CAN devices")
Reported-by: Runcheng Lu <runcheng.lu(a)hpmicro.com>
Cc: stable(a)vger.kernel.org
Reviewed-by: Vincent Mailhol <mailhol(a)kernel.org>
Signed-off-by: Celeste Liu <uwu(a)coelacanthus.name>
---
Changes in v4:
- Remove redudant typeof().
- Fix type: inteface -> interface.
- Link to v3: https://lore.kernel.org/r/20250930-gs-usb-max-if-v3-1-21d97d7f1c34@coelacan…
Changes in v3:
- Cc stable should in patch instead of cover letter.
- Link to v2: https://lore.kernel.org/r/20250930-gs-usb-max-if-v2-1-2cf9a44e6861@coelacan…
Changes in v2:
- Use flexible array member instead of fixed array.
- Link to v1: https://lore.kernel.org/r/20250929-gs-usb-max-if-v1-1-e41b5c09133a@coelacan…
---
drivers/net/can/usb/gs_usb.c | 22 ++++++++++------------
1 file changed, 10 insertions(+), 12 deletions(-)
diff --git a/drivers/net/can/usb/gs_usb.c b/drivers/net/can/usb/gs_usb.c
index c9482d6e947b0c7b033dc4f0c35f5b111e1bfd92..9fb4cbbd6d6dc88f433020eb0417ea53cd0c4d5f 100644
--- a/drivers/net/can/usb/gs_usb.c
+++ b/drivers/net/can/usb/gs_usb.c
@@ -289,11 +289,6 @@ struct gs_host_frame {
#define GS_MAX_RX_URBS 30
#define GS_NAPI_WEIGHT 32
-/* Maximum number of interfaces the driver supports per device.
- * Current hardware only supports 3 interfaces. The future may vary.
- */
-#define GS_MAX_INTF 3
-
struct gs_tx_context {
struct gs_can *dev;
unsigned int echo_id;
@@ -324,7 +319,6 @@ struct gs_can {
/* usb interface struct */
struct gs_usb {
- struct gs_can *canch[GS_MAX_INTF];
struct usb_anchor rx_submitted;
struct usb_device *udev;
@@ -336,9 +330,11 @@ struct gs_usb {
unsigned int hf_size_rx;
u8 active_channels;
+ u8 channel_cnt;
unsigned int pipe_in;
unsigned int pipe_out;
+ struct gs_can *canch[] __counted_by(channel_cnt);
};
/* 'allocate' a tx context.
@@ -599,7 +595,7 @@ static void gs_usb_receive_bulk_callback(struct urb *urb)
}
/* device reports out of range channel id */
- if (hf->channel >= GS_MAX_INTF)
+ if (hf->channel >= parent->channel_cnt)
goto device_detach;
dev = parent->canch[hf->channel];
@@ -699,7 +695,7 @@ static void gs_usb_receive_bulk_callback(struct urb *urb)
/* USB failure take down all interfaces */
if (rc == -ENODEV) {
device_detach:
- for (rc = 0; rc < GS_MAX_INTF; rc++) {
+ for (rc = 0; rc < parent->channel_cnt; rc++) {
if (parent->canch[rc])
netif_device_detach(parent->canch[rc]->netdev);
}
@@ -1460,17 +1456,19 @@ static int gs_usb_probe(struct usb_interface *intf,
icount = dconf.icount + 1;
dev_info(&intf->dev, "Configuring for %u interfaces\n", icount);
- if (icount > GS_MAX_INTF) {
+ if (icount > type_max(parent->channel_cnt)) {
dev_err(&intf->dev,
"Driver cannot handle more that %u CAN interfaces\n",
- GS_MAX_INTF);
+ type_max(parent->channel_cnt));
return -EINVAL;
}
- parent = kzalloc(sizeof(*parent), GFP_KERNEL);
+ parent = kzalloc(struct_size(parent, canch, icount), GFP_KERNEL);
if (!parent)
return -ENOMEM;
+ parent->channel_cnt = icount;
+
init_usb_anchor(&parent->rx_submitted);
usb_set_intfdata(intf, parent);
@@ -1531,7 +1529,7 @@ static void gs_usb_disconnect(struct usb_interface *intf)
return;
}
- for (i = 0; i < GS_MAX_INTF; i++)
+ for (i = 0; i < parent->channel_cnt; i++)
if (parent->canch[i])
gs_destroy_candev(parent->canch[i]);
---
base-commit: e5f0a698b34ed76002dc5cff3804a61c80233a7a
change-id: 20250929-gs-usb-max-if-a304c83243e5
Best regards,
--
Celeste Liu <uwu(a)coelacanthus.name>
From: Lance Yang <lance.yang(a)linux.dev>
When splitting an mTHP and replacing a zero-filled subpage with the shared
zeropage, try_to_map_unused_to_zeropage() currently drops several important
PTE bits.
For userspace tools like CRIU, which rely on the soft-dirty mechanism for
incremental snapshots, losing the soft-dirty bit means modified pages are
missed, leading to inconsistent memory state after restore.
As pointed out by David, the more critical uffd-wp bit is also dropped.
This breaks the userfaultfd write-protection mechanism, causing writes
to be silently missed by monitoring applications, which can lead to data
corruption.
Preserve both the soft-dirty and uffd-wp bits from the old PTE when
creating the new zeropage mapping to ensure they are correctly tracked.
Cc: <stable(a)vger.kernel.org>
Fixes: b1f202060afe ("mm: remap unused subpages to shared zeropage when splitting isolated thp")
Suggested-by: David Hildenbrand <david(a)redhat.com>
Suggested-by: Dev Jain <dev.jain(a)arm.com>
Acked-by: David Hildenbrand <david(a)redhat.com>
Reviewed-by: Dev Jain <dev.jain(a)arm.com>
Signed-off-by: Lance Yang <lance.yang(a)linux.dev>
---
v3 -> v4:
- Minor formatting tweak in try_to_map_unused_to_zeropage() function
signature (per David and Dev)
- Collect Reviewed-by from Dev - thanks!
- https://lore.kernel.org/linux-mm/20250930060557.85133-1-lance.yang@linux.de…
v2 -> v3:
- ptep_get() gets called only once per iteration (per Dev)
- https://lore.kernel.org/linux-mm/20250930043351.34927-1-lance.yang@linux.de…
v1 -> v2:
- Avoid calling ptep_get() multiple times (per Dev)
- Double-check the uffd-wp bit (per David)
- Collect Acked-by from David - thanks!
- https://lore.kernel.org/linux-mm/20250928044855.76359-1-lance.yang@linux.de…
mm/migrate.c | 16 ++++++++++------
1 file changed, 10 insertions(+), 6 deletions(-)
diff --git a/mm/migrate.c b/mm/migrate.c
index ce83c2c3c287..21a2a1bf89f7 100644
--- a/mm/migrate.c
+++ b/mm/migrate.c
@@ -296,8 +296,7 @@ bool isolate_folio_to_list(struct folio *folio, struct list_head *list)
}
static bool try_to_map_unused_to_zeropage(struct page_vma_mapped_walk *pvmw,
- struct folio *folio,
- unsigned long idx)
+ struct folio *folio, pte_t old_pte, unsigned long idx)
{
struct page *page = folio_page(folio, idx);
pte_t newpte;
@@ -306,7 +305,7 @@ static bool try_to_map_unused_to_zeropage(struct page_vma_mapped_walk *pvmw,
return false;
VM_BUG_ON_PAGE(!PageAnon(page), page);
VM_BUG_ON_PAGE(!PageLocked(page), page);
- VM_BUG_ON_PAGE(pte_present(ptep_get(pvmw->pte)), page);
+ VM_BUG_ON_PAGE(pte_present(old_pte), page);
if (folio_test_mlocked(folio) || (pvmw->vma->vm_flags & VM_LOCKED) ||
mm_forbids_zeropage(pvmw->vma->vm_mm))
@@ -322,6 +321,12 @@ static bool try_to_map_unused_to_zeropage(struct page_vma_mapped_walk *pvmw,
newpte = pte_mkspecial(pfn_pte(my_zero_pfn(pvmw->address),
pvmw->vma->vm_page_prot));
+
+ if (pte_swp_soft_dirty(old_pte))
+ newpte = pte_mksoft_dirty(newpte);
+ if (pte_swp_uffd_wp(old_pte))
+ newpte = pte_mkuffd_wp(newpte);
+
set_pte_at(pvmw->vma->vm_mm, pvmw->address, pvmw->pte, newpte);
dec_mm_counter(pvmw->vma->vm_mm, mm_counter(folio));
@@ -344,7 +349,7 @@ static bool remove_migration_pte(struct folio *folio,
while (page_vma_mapped_walk(&pvmw)) {
rmap_t rmap_flags = RMAP_NONE;
- pte_t old_pte;
+ pte_t old_pte = ptep_get(pvmw.pte);
pte_t pte;
swp_entry_t entry;
struct page *new;
@@ -365,12 +370,11 @@ static bool remove_migration_pte(struct folio *folio,
}
#endif
if (rmap_walk_arg->map_unused_to_zeropage &&
- try_to_map_unused_to_zeropage(&pvmw, folio, idx))
+ try_to_map_unused_to_zeropage(&pvmw, folio, old_pte, idx))
continue;
folio_get(folio);
pte = mk_pte(new, READ_ONCE(vma->vm_page_prot));
- old_pte = ptep_get(pvmw.pte);
entry = pte_to_swp_entry(old_pte);
if (!is_migration_entry_young(entry))
--
2.49.0
From: Lance Yang <lance.yang(a)linux.dev>
When splitting an mTHP and replacing a zero-filled subpage with the shared
zeropage, try_to_map_unused_to_zeropage() currently drops several important
PTE bits.
For userspace tools like CRIU, which rely on the soft-dirty mechanism for
incremental snapshots, losing the soft-dirty bit means modified pages are
missed, leading to inconsistent memory state after restore.
As pointed out by David, the more critical uffd-wp bit is also dropped.
This breaks the userfaultfd write-protection mechanism, causing writes
to be silently missed by monitoring applications, which can lead to data
corruption.
Preserve both the soft-dirty and uffd-wp bits from the old PTE when
creating the new zeropage mapping to ensure they are correctly tracked.
Cc: <stable(a)vger.kernel.org>
Fixes: b1f202060afe ("mm: remap unused subpages to shared zeropage when splitting isolated thp")
Suggested-by: David Hildenbrand <david(a)redhat.com>
Suggested-by: Dev Jain <dev.jain(a)arm.com>
Acked-by: David Hildenbrand <david(a)redhat.com>
Signed-off-by: Lance Yang <lance.yang(a)linux.dev>
---
v2 -> v3:
- ptep_get() gets called only once per iteration (per Dev)
- https://lore.kernel.org/linux-mm/20250930043351.34927-1-lance.yang@linux.de…
v1 -> v2:
- Avoid calling ptep_get() multiple times (per Dev)
- Double-check the uffd-wp bit (per David)
- Collect Acked-by from David - thanks!
- https://lore.kernel.org/linux-mm/20250928044855.76359-1-lance.yang@linux.de…
mm/migrate.c | 14 ++++++++++----
1 file changed, 10 insertions(+), 4 deletions(-)
diff --git a/mm/migrate.c b/mm/migrate.c
index ce83c2c3c287..bafd8cb3bebe 100644
--- a/mm/migrate.c
+++ b/mm/migrate.c
@@ -297,6 +297,7 @@ bool isolate_folio_to_list(struct folio *folio, struct list_head *list)
static bool try_to_map_unused_to_zeropage(struct page_vma_mapped_walk *pvmw,
struct folio *folio,
+ pte_t old_pte,
unsigned long idx)
{
struct page *page = folio_page(folio, idx);
@@ -306,7 +307,7 @@ static bool try_to_map_unused_to_zeropage(struct page_vma_mapped_walk *pvmw,
return false;
VM_BUG_ON_PAGE(!PageAnon(page), page);
VM_BUG_ON_PAGE(!PageLocked(page), page);
- VM_BUG_ON_PAGE(pte_present(ptep_get(pvmw->pte)), page);
+ VM_BUG_ON_PAGE(pte_present(old_pte), page);
if (folio_test_mlocked(folio) || (pvmw->vma->vm_flags & VM_LOCKED) ||
mm_forbids_zeropage(pvmw->vma->vm_mm))
@@ -322,6 +323,12 @@ static bool try_to_map_unused_to_zeropage(struct page_vma_mapped_walk *pvmw,
newpte = pte_mkspecial(pfn_pte(my_zero_pfn(pvmw->address),
pvmw->vma->vm_page_prot));
+
+ if (pte_swp_soft_dirty(old_pte))
+ newpte = pte_mksoft_dirty(newpte);
+ if (pte_swp_uffd_wp(old_pte))
+ newpte = pte_mkuffd_wp(newpte);
+
set_pte_at(pvmw->vma->vm_mm, pvmw->address, pvmw->pte, newpte);
dec_mm_counter(pvmw->vma->vm_mm, mm_counter(folio));
@@ -344,7 +351,7 @@ static bool remove_migration_pte(struct folio *folio,
while (page_vma_mapped_walk(&pvmw)) {
rmap_t rmap_flags = RMAP_NONE;
- pte_t old_pte;
+ pte_t old_pte = ptep_get(pvmw.pte);
pte_t pte;
swp_entry_t entry;
struct page *new;
@@ -365,12 +372,11 @@ static bool remove_migration_pte(struct folio *folio,
}
#endif
if (rmap_walk_arg->map_unused_to_zeropage &&
- try_to_map_unused_to_zeropage(&pvmw, folio, idx))
+ try_to_map_unused_to_zeropage(&pvmw, folio, old_pte, idx))
continue;
folio_get(folio);
pte = mk_pte(new, READ_ONCE(vma->vm_page_prot));
- old_pte = ptep_get(pvmw.pte);
entry = pte_to_swp_entry(old_pte);
if (!is_migration_entry_young(entry))
--
2.49.0
From: Zheng Qixing <zhengqixing(a)huawei.com>
From: Jan Kara <jack(a)suse.cz>
[ Upstream commit 7e49538288e523427beedd26993d446afef1a6fb ]
Syzbot came up with a reproducer where a loop device block size is
changed underneath a mounted filesystem. This causes a mismatch between
the block device block size and the block size stored in the superblock
causing confusion in various places such as fs/buffer.c. The particular
issue triggered by syzbot was a warning in __getblk_slow() due to
requested buffer size not matching block device block size.
Fix the problem by getting exclusive hold of the loop device to change
its block size. This fails if somebody (such as filesystem) has already
an exclusive ownership of the block device and thus prevents modifying
the loop device under some exclusive owner which doesn't expect it.
Reported-by: syzbot+01ef7a8da81a975e1ccd(a)syzkaller.appspotmail.com
Signed-off-by: Jan Kara <jack(a)suse.cz>
Tested-by: syzbot+01ef7a8da81a975e1ccd(a)syzkaller.appspotmail.com
Link: https://lore.kernel.org/r/20250711163202.19623-2-jack@suse.cz
Signed-off-by: Zheng Qixing <zhengqixing(a)huawei.com>
---
drivers/block/loop.c | 40 +++++++++++++++++++++++++++++++---------
1 file changed, 31 insertions(+), 9 deletions(-)
diff --git a/drivers/block/loop.c b/drivers/block/loop.c
index 455e2a2b149f..6fe9180aafb3 100644
--- a/drivers/block/loop.c
+++ b/drivers/block/loop.c
@@ -1472,19 +1472,36 @@ static int loop_set_dio(struct loop_device *lo, unsigned long arg)
return error;
}
-static int loop_set_block_size(struct loop_device *lo, unsigned long arg)
+static int loop_set_block_size(struct loop_device *lo, blk_mode_t mode,
+ struct block_device *bdev, unsigned long arg)
{
int err = 0;
- if (lo->lo_state != Lo_bound)
- return -ENXIO;
+ /*
+ * If we don't hold exclusive handle for the device, upgrade to it
+ * here to avoid changing device under exclusive owner.
+ */
+ if (!(mode & BLK_OPEN_EXCL)) {
+ err = bd_prepare_to_claim(bdev, loop_set_block_size, NULL);
+ if (err)
+ return err;
+ }
+
+ err = mutex_lock_killable(&lo->lo_mutex);
+ if (err)
+ goto abort_claim;
+
+ if (lo->lo_state != Lo_bound) {
+ err = -ENXIO;
+ goto unlock;
+ }
err = blk_validate_block_size(arg);
if (err)
- return err;
+ goto unlock;
if (lo->lo_queue->limits.logical_block_size == arg)
- return 0;
+ goto unlock;
sync_blockdev(lo->lo_device);
invalidate_bdev(lo->lo_device);
@@ -1496,6 +1513,11 @@ static int loop_set_block_size(struct loop_device *lo, unsigned long arg)
loop_update_dio(lo);
blk_mq_unfreeze_queue(lo->lo_queue);
+unlock:
+ mutex_unlock(&lo->lo_mutex);
+abort_claim:
+ if (!(mode & BLK_OPEN_EXCL))
+ bd_abort_claiming(bdev, loop_set_block_size);
return err;
}
@@ -1514,9 +1536,6 @@ static int lo_simple_ioctl(struct loop_device *lo, unsigned int cmd,
case LOOP_SET_DIRECT_IO:
err = loop_set_dio(lo, arg);
break;
- case LOOP_SET_BLOCK_SIZE:
- err = loop_set_block_size(lo, arg);
- break;
default:
err = -EINVAL;
}
@@ -1571,9 +1590,12 @@ static int lo_ioctl(struct block_device *bdev, blk_mode_t mode,
break;
case LOOP_GET_STATUS64:
return loop_get_status64(lo, argp);
+ case LOOP_SET_BLOCK_SIZE:
+ if (!(mode & BLK_OPEN_WRITE) && !capable(CAP_SYS_ADMIN))
+ return -EPERM;
+ return loop_set_block_size(lo, mode, bdev, arg);
case LOOP_SET_CAPACITY:
case LOOP_SET_DIRECT_IO:
- case LOOP_SET_BLOCK_SIZE:
if (!(mode & BLK_OPEN_WRITE) && !capable(CAP_SYS_ADMIN))
return -EPERM;
fallthrough;
--
2.39.2
The driver trusts the RX descriptor length and uses it directly for
dev_alloc_skb(), memcpy_fromio(), and skb_put() without any bounds
checking. If the descriptor gets corrupted or otherwise contains an
invalid value, this can lead to an excessive allocation or reading
past the per-buffer limit programmed by the driver.
Validate 'len' read from the descriptor and drop the frame if it is
zero or greater than HDLC_MAX_MRU. The driver programs BFLL to
HDLC_MAX_MRU for RX buffers, so this is the correct upper bound.
Fixes: 1da177e4c3f4 ("Linux-2.6.12-rc2")
Cc: stable(a)vger.kernel.org
Signed-off-by: Guangshuo Li <lgs201920130244(a)gmail.com>
---
drivers/net/wan/hd64572.c | 6 ++++++
1 file changed, 6 insertions(+)
diff --git a/drivers/net/wan/hd64572.c b/drivers/net/wan/hd64572.c
index 534369ffe5de..6327204e3c02 100644
--- a/drivers/net/wan/hd64572.c
+++ b/drivers/net/wan/hd64572.c
@@ -199,6 +199,12 @@ static inline void sca_rx(card_t *card, port_t *port, pkt_desc __iomem *desc,
u32 buff;
len = readw(&desc->len);
+
+ if (unlikely(!len || len > HDLC_MAX_MRU)) {
+ dev->stats.rx_length_errors++;
+ return;
+ }
+
skb = dev_alloc_skb(len);
if (!skb) {
dev->stats.rx_dropped++;
--
2.43.0
Another day, another syzkaller bug. KVM erroneously allows userspace to
pend vCPU events for a vCPU that hasn't been initialized yet, leading to
KVM interpreting a bunch of uninitialized garbage for routing /
injecting the exception.
In one case the injection code and the hyp disagree on whether the vCPU
has a 32bit EL1 and put the vCPU into an illegal mode for AArch64,
tripping the BUG() in exception_target_el() during the next injection:
kernel BUG at arch/arm64/kvm/inject_fault.c:40!
Internal error: Oops - BUG: 00000000f2000800 [#1] SMP
CPU: 3 UID: 0 PID: 318 Comm: repro Not tainted 6.17.0-rc4-00104-g10fd0285305d #6 PREEMPT
Hardware name: linux,dummy-virt (DT)
pstate: 21402009 (nzCv daif +PAN -UAO -TCO +DIT -SSBS BTYPE=--)
pc : exception_target_el+0x88/0x8c
lr : pend_serror_exception+0x18/0x13c
sp : ffff800082f03a10
x29: ffff800082f03a10 x28: ffff0000cb132280 x27: 0000000000000000
x26: 0000000000000000 x25: ffff0000c2a99c20 x24: 0000000000000000
x23: 0000000000008000 x22: 0000000000000002 x21: 0000000000000004
x20: 0000000000008000 x19: ffff0000c2a99c20 x18: 0000000000000000
x17: 0000000000000000 x16: 0000000000000000 x15: 00000000200000c0
x14: 0000000000000000 x13: 0000000000000000 x12: 0000000000000000
x11: 0000000000000000 x10: 0000000000000000 x9 : 0000000000000000
x8 : ffff800082f03af8 x7 : 0000000000000000 x6 : 0000000000000000
x5 : ffff800080f621f0 x4 : 0000000000000000 x3 : 0000000000000000
x2 : 000000000040009b x1 : 0000000000000003 x0 : ffff0000c2a99c20
Call trace:
exception_target_el+0x88/0x8c (P)
kvm_inject_serror_esr+0x40/0x3b4
__kvm_arm_vcpu_set_events+0xf0/0x100
kvm_arch_vcpu_ioctl+0x180/0x9d4
kvm_vcpu_ioctl+0x60c/0x9f4
__arm64_sys_ioctl+0xac/0x104
invoke_syscall+0x48/0x110
el0_svc_common.constprop.0+0x40/0xe0
do_el0_svc+0x1c/0x28
el0_svc+0x34/0xf0
el0t_64_sync_handler+0xa0/0xe4
el0t_64_sync+0x198/0x19c
Code: f946bc01 b4fffe61 9101e020 17fffff2 (d4210000)
Reject the ioctls outright as no sane VMM would call these before
KVM_ARM_VCPU_INIT anyway. Even if it did the exception would've been
thrown away by the eventual reset of the vCPU's state.
Cc: stable(a)vger.kernel.org # 6.17
Fixes: b7b27facc7b5 ("arm/arm64: KVM: Add KVM_GET/SET_VCPU_EVENTS")
Signed-off-by: Oliver Upton <oliver.upton(a)linux.dev>
---
While the blamed commit is indeed broken, only 6.17+ kernels actually
hit the BUG() due to commit efa1368ba9f4 ("KVM: arm64: Commit exceptions
from KVM_SET_VCPU_EVENTS immediately).
arch/arm64/kvm/arm.c | 6 ++++++
1 file changed, 6 insertions(+)
diff --git a/arch/arm64/kvm/arm.c b/arch/arm64/kvm/arm.c
index a59b4046617c..c44357d26ee8 100644
--- a/arch/arm64/kvm/arm.c
+++ b/arch/arm64/kvm/arm.c
@@ -1795,6 +1795,9 @@ long kvm_arch_vcpu_ioctl(struct file *filp,
case KVM_GET_VCPU_EVENTS: {
struct kvm_vcpu_events events;
+ if (!kvm_vcpu_initialized(vcpu))
+ return -ENOEXEC;
+
if (kvm_arm_vcpu_get_events(vcpu, &events))
return -EINVAL;
@@ -1806,6 +1809,9 @@ long kvm_arch_vcpu_ioctl(struct file *filp,
case KVM_SET_VCPU_EVENTS: {
struct kvm_vcpu_events events;
+ if (!kvm_vcpu_initialized(vcpu))
+ return -ENOEXEC;
+
if (copy_from_user(&events, argp, sizeof(events)))
return -EFAULT;
base-commit: 10fd0285305d0b48e8a3bf15d4f17fc4f3d68cb6
--
2.39.5
Hello,
After upgrading to 6.16.9 this morning, my laptop can't boot. I cannot
get any logs because the kernel seems to freeze very early, even before
I'm asked for the full disk encryption passphrase.
This is a regression from 6.16.8 to 6.16.9.
I did a git bisect in the stable/linux and this is the commit causing
the issue for me:
97207a4fed5348ff5c5e71a7300db9b638640879 is the first bad commit
commit 97207a4fed5348ff5c5e71a7300db9b638640879 (HEAD)
Author: Daniele Ceraolo Spurio <daniele.ceraolospurio(a)intel.com>
Date: Wed Jun 25 13:54:06 2025 -0700
drm/xe/guc: Enable extended CAT error reporting
[ Upstream commit a7ffcea8631af91479cab10aa7fbfd0722f01d9a ]
https://lore.kernel.org/all/20250625205405.1653212-3-daniele.ceraolospurio@…
How to reproduce:
1. Upgrade to 6.16.9
2. Enable the Xe driver by passing i915.force_probe=!7d55
xe.force_probe=7d55
3. Reboot
Best regards,
Iyán
--
Iyán Méndez Veiga
GPG Key: 204C 461F BA8C 81D1 0327 E647 422E 3694 311E 5AC1
In ips_init_phase1(), most early-exit error paths use ips_abort_init(),
which properly releases ioremap_ptr. However, the path where kzalloc()
fails does not go through ips_abort_init() and therefore skips unmapping
ioremap_ptr, leading to a potential resource leak.
Add the missing iounmap() call in this specific failure path.
Fixes: 1da177e4c3f4 ("Linux-2.6.12-rc2")
Cc: stable(a)vger.kernel.org
Signed-off-by: Zhen Ni <zhen.ni(a)easystack.cn>
---
drivers/scsi/ips.c | 2 ++
1 file changed, 2 insertions(+)
diff --git a/drivers/scsi/ips.c b/drivers/scsi/ips.c
index 94adb6ac02a4..a34167ec3038 100644
--- a/drivers/scsi/ips.c
+++ b/drivers/scsi/ips.c
@@ -6877,6 +6877,8 @@ ips_init_phase1(struct pci_dev *pci_dev, int *indexPtr)
if (ha == NULL) {
IPS_PRINTK(KERN_WARNING, pci_dev,
"Unable to allocate temporary ha struct\n");
+ if (ioremap_ptr)
+ iounmap(ioremap_ptr);
return -1;
}
--
2.20.1
The error return from bio_split() is not checked before
being passed to bio_chain(), leading to a kernel panic
from an invalid pointer dereference.
Add a check with IS_ERR() to handle the allocation failure
and prevent the crash.
This patch fixes a bug in the pktcdvd driver, which was removed
from the mainline kernel but still exists in stable branches.
Fixes: 4b83e99ee7092 ("Revert "pktcdvd: remove driver."")
Cc: stable(a)vger.kernel.org
Signed-off-by: Haotian Zhang <vulab(a)iscas.ac.cn>
---
drivers/block/pktcdvd.c | 2 ++
1 file changed, 2 insertions(+)
diff --git a/drivers/block/pktcdvd.c b/drivers/block/pktcdvd.c
index 65b96c083b3c..c0999c3d167a 100644
--- a/drivers/block/pktcdvd.c
+++ b/drivers/block/pktcdvd.c
@@ -2466,6 +2466,8 @@ static void pkt_submit_bio(struct bio *bio)
split = bio_split(bio, last_zone -
bio->bi_iter.bi_sector,
GFP_NOIO, &pkt_bio_set);
+ if (IS_ERR(split))
+ goto end_io;
bio_chain(split, bio);
} else {
split = bio;
--
2.25.1
This issue was found by Runcheng Lu when develop HSCanT USB to CAN FD
converter[1]. The original developers may have only 3 intefaces device to
test so they write 3 here and wait for future change.
During the HSCanT development, we actually used 4 interfaces, so the
limitation of 3 is not enough now. But just increase one is not
future-proofed. Since the channel type in gs_host_frame is u8, just
increase interface number limit to max size of u8 safely.
[1]: https://github.com/cherry-embedded/HSCanT-hardware
Fixes: d08e973a77d1 ("can: gs_usb: Added support for the GS_USB CAN devices")
Reported-by: Runcheng Lu <runcheng.lu(a)hpmicro.com>
Cc: stable(a)vger.kernel.org
Signed-off-by: Celeste Liu <uwu(a)coelacanthus.name>
---
Changes in v3:
- Cc stable should in patch instead of cover letter.
- Link to v2: https://lore.kernel.org/r/20250930-gs-usb-max-if-v2-1-2cf9a44e6861@coelacan…
Changes in v2:
- Use flexible array member instead of fixed array.
- Link to v1: https://lore.kernel.org/r/20250929-gs-usb-max-if-v1-1-e41b5c09133a@coelacan…
---
drivers/net/can/usb/gs_usb.c | 22 ++++++++++------------
1 file changed, 10 insertions(+), 12 deletions(-)
diff --git a/drivers/net/can/usb/gs_usb.c b/drivers/net/can/usb/gs_usb.c
index c9482d6e947b0c7b033dc4f0c35f5b111e1bfd92..69b068c8fa8fbab42337e2b0a3d0860ac678c792 100644
--- a/drivers/net/can/usb/gs_usb.c
+++ b/drivers/net/can/usb/gs_usb.c
@@ -289,11 +289,6 @@ struct gs_host_frame {
#define GS_MAX_RX_URBS 30
#define GS_NAPI_WEIGHT 32
-/* Maximum number of interfaces the driver supports per device.
- * Current hardware only supports 3 interfaces. The future may vary.
- */
-#define GS_MAX_INTF 3
-
struct gs_tx_context {
struct gs_can *dev;
unsigned int echo_id;
@@ -324,7 +319,6 @@ struct gs_can {
/* usb interface struct */
struct gs_usb {
- struct gs_can *canch[GS_MAX_INTF];
struct usb_anchor rx_submitted;
struct usb_device *udev;
@@ -336,9 +330,11 @@ struct gs_usb {
unsigned int hf_size_rx;
u8 active_channels;
+ u8 channel_cnt;
unsigned int pipe_in;
unsigned int pipe_out;
+ struct gs_can *canch[] __counted_by(channel_cnt);
};
/* 'allocate' a tx context.
@@ -599,7 +595,7 @@ static void gs_usb_receive_bulk_callback(struct urb *urb)
}
/* device reports out of range channel id */
- if (hf->channel >= GS_MAX_INTF)
+ if (hf->channel >= parent->channel_cnt)
goto device_detach;
dev = parent->canch[hf->channel];
@@ -699,7 +695,7 @@ static void gs_usb_receive_bulk_callback(struct urb *urb)
/* USB failure take down all interfaces */
if (rc == -ENODEV) {
device_detach:
- for (rc = 0; rc < GS_MAX_INTF; rc++) {
+ for (rc = 0; rc < parent->channel_cnt; rc++) {
if (parent->canch[rc])
netif_device_detach(parent->canch[rc]->netdev);
}
@@ -1460,17 +1456,19 @@ static int gs_usb_probe(struct usb_interface *intf,
icount = dconf.icount + 1;
dev_info(&intf->dev, "Configuring for %u interfaces\n", icount);
- if (icount > GS_MAX_INTF) {
+ if (icount > type_max(typeof(parent->channel_cnt))) {
dev_err(&intf->dev,
"Driver cannot handle more that %u CAN interfaces\n",
- GS_MAX_INTF);
+ type_max(typeof(parent->channel_cnt)));
return -EINVAL;
}
- parent = kzalloc(sizeof(*parent), GFP_KERNEL);
+ parent = kzalloc(struct_size(parent, canch, icount), GFP_KERNEL);
if (!parent)
return -ENOMEM;
+ parent->channel_cnt = icount;
+
init_usb_anchor(&parent->rx_submitted);
usb_set_intfdata(intf, parent);
@@ -1531,7 +1529,7 @@ static void gs_usb_disconnect(struct usb_interface *intf)
return;
}
- for (i = 0; i < GS_MAX_INTF; i++)
+ for (i = 0; i < parent->channel_cnt; i++)
if (parent->canch[i])
gs_destroy_candev(parent->canch[i]);
---
base-commit: e5f0a698b34ed76002dc5cff3804a61c80233a7a
change-id: 20250929-gs-usb-max-if-a304c83243e5
Best regards,
--
Celeste Liu <uwu(a)coelacanthus.name>
From: Lance Yang <lance.yang(a)linux.dev>
When splitting an mTHP and replacing a zero-filled subpage with the shared
zeropage, try_to_map_unused_to_zeropage() currently drops several important
PTE bits.
For userspace tools like CRIU, which rely on the soft-dirty mechanism for
incremental snapshots, losing the soft-dirty bit means modified pages are
missed, leading to inconsistent memory state after restore.
As pointed out by David, the more critical uffd-wp bit is also dropped.
This breaks the userfaultfd write-protection mechanism, causing writes
to be silently missed by monitoring applications, which can lead to data
corruption.
Preserve both the soft-dirty and uffd-wp bits from the old PTE when
creating the new zeropage mapping to ensure they are correctly tracked.
Cc: <stable(a)vger.kernel.org>
Fixes: b1f202060afe ("mm: remap unused subpages to shared zeropage when splitting isolated thp")
Suggested-by: David Hildenbrand <david(a)redhat.com>
Suggested-by: Dev Jain <dev.jain(a)arm.com>
Acked-by: David Hildenbrand <david(a)redhat.com>
Signed-off-by: Lance Yang <lance.yang(a)linux.dev>
---
v1 -> v2:
- Avoid calling ptep_get() multiple times (per Dev)
- Double-check the uffd-wp bit (per David)
- Collect Acked-by from David - thanks!
- https://lore.kernel.org/linux-mm/20250928044855.76359-1-lance.yang@linux.de…
mm/migrate.c | 9 ++++++++-
1 file changed, 8 insertions(+), 1 deletion(-)
diff --git a/mm/migrate.c b/mm/migrate.c
index ce83c2c3c287..50aa91d9ab4e 100644
--- a/mm/migrate.c
+++ b/mm/migrate.c
@@ -300,13 +300,14 @@ static bool try_to_map_unused_to_zeropage(struct page_vma_mapped_walk *pvmw,
unsigned long idx)
{
struct page *page = folio_page(folio, idx);
+ pte_t oldpte = ptep_get(pvmw->pte);
pte_t newpte;
if (PageCompound(page))
return false;
VM_BUG_ON_PAGE(!PageAnon(page), page);
VM_BUG_ON_PAGE(!PageLocked(page), page);
- VM_BUG_ON_PAGE(pte_present(ptep_get(pvmw->pte)), page);
+ VM_BUG_ON_PAGE(pte_present(oldpte), page);
if (folio_test_mlocked(folio) || (pvmw->vma->vm_flags & VM_LOCKED) ||
mm_forbids_zeropage(pvmw->vma->vm_mm))
@@ -322,6 +323,12 @@ static bool try_to_map_unused_to_zeropage(struct page_vma_mapped_walk *pvmw,
newpte = pte_mkspecial(pfn_pte(my_zero_pfn(pvmw->address),
pvmw->vma->vm_page_prot));
+
+ if (pte_swp_soft_dirty(oldpte))
+ newpte = pte_mksoft_dirty(newpte);
+ if (pte_swp_uffd_wp(oldpte))
+ newpte = pte_mkuffd_wp(newpte);
+
set_pte_at(pvmw->vma->vm_mm, pvmw->address, pvmw->pte, newpte);
dec_mm_counter(pvmw->vma->vm_mm, mm_counter(folio));
--
2.49.0
This issue was found by Runcheng Lu when develop HSCanT USB to CAN FD
converter[1]. The original developers may have only 3 intefaces device to
test so they write 3 here and wait for future change.
During the HSCanT development, we actually used 4 interfaces, so the
limitation of 3 is not enough now. But just increase one is not
future-proofed. Since the channel type in gs_host_frame is u8, just
increase interface number limit to max size of u8 safely.
[1]: https://github.com/cherry-embedded/HSCanT-hardware
Fixes: d08e973a77d1 ("can: gs_usb: Added support for the GS_USB CAN devices")
Reported-by: Runcheng Lu <runcheng.lu(a)hpmicro.com>
Signed-off-by: Celeste Liu <uwu(a)coelacanthus.name>
---
Changes in v2:
- Use flexible array member instead of fixed array.
- Link to v1: https://lore.kernel.org/r/20250929-gs-usb-max-if-v1-1-e41b5c09133a@coelacan…
---
drivers/net/can/usb/gs_usb.c | 22 ++++++++++------------
1 file changed, 10 insertions(+), 12 deletions(-)
diff --git a/drivers/net/can/usb/gs_usb.c b/drivers/net/can/usb/gs_usb.c
index c9482d6e947b0c7b033dc4f0c35f5b111e1bfd92..69b068c8fa8fbab42337e2b0a3d0860ac678c792 100644
--- a/drivers/net/can/usb/gs_usb.c
+++ b/drivers/net/can/usb/gs_usb.c
@@ -289,11 +289,6 @@ struct gs_host_frame {
#define GS_MAX_RX_URBS 30
#define GS_NAPI_WEIGHT 32
-/* Maximum number of interfaces the driver supports per device.
- * Current hardware only supports 3 interfaces. The future may vary.
- */
-#define GS_MAX_INTF 3
-
struct gs_tx_context {
struct gs_can *dev;
unsigned int echo_id;
@@ -324,7 +319,6 @@ struct gs_can {
/* usb interface struct */
struct gs_usb {
- struct gs_can *canch[GS_MAX_INTF];
struct usb_anchor rx_submitted;
struct usb_device *udev;
@@ -336,9 +330,11 @@ struct gs_usb {
unsigned int hf_size_rx;
u8 active_channels;
+ u8 channel_cnt;
unsigned int pipe_in;
unsigned int pipe_out;
+ struct gs_can *canch[] __counted_by(channel_cnt);
};
/* 'allocate' a tx context.
@@ -599,7 +595,7 @@ static void gs_usb_receive_bulk_callback(struct urb *urb)
}
/* device reports out of range channel id */
- if (hf->channel >= GS_MAX_INTF)
+ if (hf->channel >= parent->channel_cnt)
goto device_detach;
dev = parent->canch[hf->channel];
@@ -699,7 +695,7 @@ static void gs_usb_receive_bulk_callback(struct urb *urb)
/* USB failure take down all interfaces */
if (rc == -ENODEV) {
device_detach:
- for (rc = 0; rc < GS_MAX_INTF; rc++) {
+ for (rc = 0; rc < parent->channel_cnt; rc++) {
if (parent->canch[rc])
netif_device_detach(parent->canch[rc]->netdev);
}
@@ -1460,17 +1456,19 @@ static int gs_usb_probe(struct usb_interface *intf,
icount = dconf.icount + 1;
dev_info(&intf->dev, "Configuring for %u interfaces\n", icount);
- if (icount > GS_MAX_INTF) {
+ if (icount > type_max(typeof(parent->channel_cnt))) {
dev_err(&intf->dev,
"Driver cannot handle more that %u CAN interfaces\n",
- GS_MAX_INTF);
+ type_max(typeof(parent->channel_cnt)));
return -EINVAL;
}
- parent = kzalloc(sizeof(*parent), GFP_KERNEL);
+ parent = kzalloc(struct_size(parent, canch, icount), GFP_KERNEL);
if (!parent)
return -ENOMEM;
+ parent->channel_cnt = icount;
+
init_usb_anchor(&parent->rx_submitted);
usb_set_intfdata(intf, parent);
@@ -1531,7 +1529,7 @@ static void gs_usb_disconnect(struct usb_interface *intf)
return;
}
- for (i = 0; i < GS_MAX_INTF; i++)
+ for (i = 0; i < parent->channel_cnt; i++)
if (parent->canch[i])
gs_destroy_candev(parent->canch[i]);
---
base-commit: e5f0a698b34ed76002dc5cff3804a61c80233a7a
change-id: 20250929-gs-usb-max-if-a304c83243e5
Best regards,
--
Celeste Liu <uwu(a)coelacanthus.name>
From: Lizhi Xu <lizhi.xu(a)windriver.com>
[ Upstream commit 66d938e89e940e512f4c3deac938ecef399c13f9 ]
The filio lock has been released here, so there is no need to jump to
error_folio_unlock to release it again.
Reported-by: syzbot+b73c7d94a151e2ee1e9b(a)syzkaller.appspotmail.com
Closes: https://syzkaller.appspot.com/bug?extid=b73c7d94a151e2ee1e9b
Signed-off-by: Lizhi Xu <lizhi.xu(a)windriver.com>
Acked-by: David Howells <dhowells(a)redhat.com>
Reviewed-by: Paulo Alcantara (Red Hat) <pc(a)manguebit.org>
Signed-off-by: Christian Brauner <brauner(a)kernel.org>
Signed-off-by: Sasha Levin <sashal(a)kernel.org>
---
LLM Generated explanations, may be completely bogus:
Based on my comprehensive investigation, here is my analysis:
## Backport Decision: **YES**
### Detailed Analysis
#### Bug Description
This commit fixes a **critical double-unlock bug** in the netfs (Network
Filesystem Library) buffered write path. The bug was introduced in
commit 8f52de0077ba3b (v6.12-rc1) during a performance optimization
refactoring.
**The specific bug**: In the `flush_content` error path at
fs/netfs/buffered_write.c:346, the code unlocks and releases a folio,
then on line 350, if `filemap_write_and_wait_range()` fails, it jumps to
`error_folio_unlock` which attempts to unlock the **already unlocked**
folio again (line 407).
```c
flush_content:
folio_unlock(folio); // First unlock - line 346
folio_put(folio);
ret = filemap_write_and_wait_range(...);
if (ret < 0)
goto error_folio_unlock; // BUG: jumps to unlock again!
```
**The fix**: Changes line 350 from `goto error_folio_unlock` to `goto
out`, correctly bypassing the duplicate unlock.
#### Severity Assessment: **HIGH**
1. **Impact**:
- With `CONFIG_DEBUG_VM=y`: Immediate kernel panic via
`VM_BUG_ON_FOLIO()` at mm/filemap.c:1498
- With `CONFIG_DEBUG_VM=n`: Silent memory corruption, undefined
behavior, potential use-after-free
- Affects **all network filesystems**: 9p, AFS, Ceph, NFS, SMB/CIFS
2. **Syzbot Evidence**:
- Bug ID: syzbot+b73c7d94a151e2ee1e9b(a)syzkaller.appspotmail.com
- Title: "kernel BUG in netfs_perform_write"
- **17 crash instances** recorded
- Reproducers available (both C and syz formats)
- Affected multiple kernel versions (5.4, 5.10, 5.15, 6.1, 6.12)
3. **Triggering Conditions** (Moderate likelihood):
- Network filesystem write operation
- Incompatible write scenario (netfs_group mismatch or streaming
write conflict)
- I/O error from `filemap_write_and_wait_range()` (network failure,
memory pressure, etc.)
#### Backport Criteria Evaluation
✅ **Fixes important bug affecting users**: Yes - causes kernel panics
and potential memory corruption for all network filesystem users
✅ **Small and contained fix**: Yes - **single line change**, minimal
code modification
✅ **No architectural changes**: Yes - simple error path correction
✅ **Minimal regression risk**: Yes - obviously correct fix, well-
reviewed (Acked-by David Howells, Reviewed-by Paulo Alcantara)
✅ **Confined to subsystem**: Yes - only touches netfs buffered write
error path
✅ **Well-tested**: Yes - syzbot has reproducers, 17 crash instances
documented
#### Affected Stable Trees
**Bug introduced**: v6.12-rc1 (commit 8f52de0077ba3b)
**Bug fixed**: v6.17 (commit 66d938e89e940)
**Vulnerable stable kernels**: 6.12.x, 6.13.x, 6.14.x, 6.15.x, 6.16.x
#### Missing Metadata (Should be added)
The commit is **missing critical stable backport tags**:
- No `Fixes: 8f52de0077ba3b ("netfs: Reduce number of conditional
branches in netfs_perform_write()")`
- No `Cc: stable(a)vger.kernel.org`
This appears to be an oversight, as the fix clearly qualifies for stable
backporting.
### Conclusion
**Strong YES for backporting**. This is a textbook stable tree
candidate:
- Fixes a serious kernel panic/memory corruption bug
- One-line change with zero regression risk
- Affects production users of network filesystems
- Well-tested with reproducers
- Reviewed and acked by subsystem maintainers
The fix should be backported to **all stable kernels containing commit
8f52de0077ba3b** (6.12+).
fs/netfs/buffered_write.c | 2 +-
1 file changed, 1 insertion(+), 1 deletion(-)
diff --git a/fs/netfs/buffered_write.c b/fs/netfs/buffered_write.c
index f27ea5099a681..09394ac2c180d 100644
--- a/fs/netfs/buffered_write.c
+++ b/fs/netfs/buffered_write.c
@@ -347,7 +347,7 @@ ssize_t netfs_perform_write(struct kiocb *iocb, struct iov_iter *iter,
folio_put(folio);
ret = filemap_write_and_wait_range(mapping, fpos, fpos + flen - 1);
if (ret < 0)
- goto error_folio_unlock;
+ goto out;
continue;
copied:
--
2.51.0
From: Lance Yang <lance.yang(a)linux.dev>
When splitting an mTHP and replacing a zero-filled subpage with the shared
zeropage, try_to_map_unused_to_zeropage() currently drops the soft-dirty
bit.
For userspace tools like CRIU, which rely on the soft-dirty mechanism for
incremental snapshots, losing this bit means modified pages are missed,
leading to inconsistent memory state after restore.
Preserve the soft-dirty bit from the old PTE when creating the zeropage
mapping to ensure modified pages are correctly tracked.
Cc: <stable(a)vger.kernel.org>
Fixes: b1f202060afe ("mm: remap unused subpages to shared zeropage when splitting isolated thp")
Signed-off-by: Lance Yang <lance.yang(a)linux.dev>
---
mm/migrate.c | 4 ++++
1 file changed, 4 insertions(+)
diff --git a/mm/migrate.c b/mm/migrate.c
index ce83c2c3c287..bf364ba07a3f 100644
--- a/mm/migrate.c
+++ b/mm/migrate.c
@@ -322,6 +322,10 @@ static bool try_to_map_unused_to_zeropage(struct page_vma_mapped_walk *pvmw,
newpte = pte_mkspecial(pfn_pte(my_zero_pfn(pvmw->address),
pvmw->vma->vm_page_prot));
+
+ if (pte_swp_soft_dirty(ptep_get(pvmw->pte)))
+ newpte = pte_mksoft_dirty(newpte);
+
set_pte_at(pvmw->vma->vm_mm, pvmw->address, pvmw->pte, newpte);
dec_mm_counter(pvmw->vma->vm_mm, mm_counter(folio));
--
2.49.0
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DAMON's virtual address space operation set implementation (vaddr) calls
pte_offset_map_lock() inside the page table walk callback function.
This is for reading and writing page table accessed bits. If
pte_offset_map_lock() fails, it retries by returning the page table walk
callback function with ACTION_AGAIN.
pte_offset_map_lock() can continuously fail if the target is a pmd
migration entry, though. Hence it could cause an infinite page table
walk if the migration cannot be done until the page table walk is
finished. This indeed caused a soft lockup when CPU hotplugging and
DAMON were running in parallel.
Avoid the infinite loop by simply not retrying the page table walk.
DAMON is promising only a best-effort accuracy, so missing access to
such pages is no problem.
Reported-by: Xinyu Zheng <zhengxinyu6(a)huawei.com>
Closes: https://lore.kernel.org/20250918030029.2652607-1-zhengxinyu6@huawei.com
Fixes: 7780d04046a2 ("mm/pagewalkers: ACTION_AGAIN if pte_offset_map_lock() fails")
Cc: <stable(a)vger.kernel.org> # 6.5.x
Cc: Hugh Dickins <hughd(a)google.com>
Signed-off-by: SeongJae Park <sj(a)kernel.org>
---
mm/damon/vaddr.c | 8 ++------
1 file changed, 2 insertions(+), 6 deletions(-)
diff --git a/mm/damon/vaddr.c b/mm/damon/vaddr.c
index 8c048f9b129e..7e834467b2d8 100644
--- a/mm/damon/vaddr.c
+++ b/mm/damon/vaddr.c
@@ -328,10 +328,8 @@ static int damon_mkold_pmd_entry(pmd_t *pmd, unsigned long addr,
}
pte = pte_offset_map_lock(walk->mm, pmd, addr, &ptl);
- if (!pte) {
- walk->action = ACTION_AGAIN;
+ if (!pte)
return 0;
- }
if (!pte_present(ptep_get(pte)))
goto out;
damon_ptep_mkold(pte, walk->vma, addr);
@@ -481,10 +479,8 @@ static int damon_young_pmd_entry(pmd_t *pmd, unsigned long addr,
#endif /* CONFIG_TRANSPARENT_HUGEPAGE */
pte = pte_offset_map_lock(walk->mm, pmd, addr, &ptl);
- if (!pte) {
- walk->action = ACTION_AGAIN;
+ if (!pte)
return 0;
- }
ptent = ptep_get(pte);
if (!pte_present(ptent))
goto out;
base-commit: 3169a901e935bc1f2d2eec0171abcf524b7747e4
--
2.39.5
The patch below does not apply to the 5.4-stable tree.
If someone wants it applied there, or to any other stable or longterm
tree, then please email the backport, including the original git commit
id to <stable(a)vger.kernel.org>.
To reproduce the conflict and resubmit, you may use the following commands:
git fetch https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git/ linux-5.4.y
git checkout FETCH_HEAD
git cherry-pick -x 7b7387650dcf2881fd8bb55bcf3c8bd6c9542dd7
# <resolve conflicts, build, test, etc.>
git commit -s
git send-email --to '<stable(a)vger.kernel.org>' --in-reply-to '2025092932-output-egotism-4918@gregkh' --subject-prefix 'PATCH 5.4.y' HEAD^..
Possible dependencies:
thanks,
greg k-h
------------------ original commit in Linus's tree ------------------
From 7b7387650dcf2881fd8bb55bcf3c8bd6c9542dd7 Mon Sep 17 00:00:00 2001
From: Jinjiang Tu <tujinjiang(a)huawei.com>
Date: Fri, 12 Sep 2025 15:41:39 +0800
Subject: [PATCH] mm/hugetlb: fix folio is still mapped when deleted
Migration may be raced with fallocating hole. remove_inode_single_folio
will unmap the folio if the folio is still mapped. However, it's called
without folio lock. If the folio is migrated and the mapped pte has been
converted to migration entry, folio_mapped() returns false, and won't
unmap it. Due to extra refcount held by remove_inode_single_folio,
migration fails, restores migration entry to normal pte, and the folio is
mapped again. As a result, we triggered BUG in filemap_unaccount_folio.
The log is as follows:
BUG: Bad page cache in process hugetlb pfn:156c00
page: refcount:515 mapcount:0 mapping:0000000099fef6e1 index:0x0 pfn:0x156c00
head: order:9 mapcount:1 entire_mapcount:1 nr_pages_mapped:0 pincount:0
aops:hugetlbfs_aops ino:dcc dentry name(?):"my_hugepage_file"
flags: 0x17ffffc00000c1(locked|waiters|head|node=0|zone=2|lastcpupid=0x1fffff)
page_type: f4(hugetlb)
page dumped because: still mapped when deleted
CPU: 1 UID: 0 PID: 395 Comm: hugetlb Not tainted 6.17.0-rc5-00044-g7aac71907bde-dirty #484 NONE
Hardware name: QEMU Ubuntu 24.04 PC (i440FX + PIIX, 1996), BIOS 0.0.0 02/06/2015
Call Trace:
<TASK>
dump_stack_lvl+0x4f/0x70
filemap_unaccount_folio+0xc4/0x1c0
__filemap_remove_folio+0x38/0x1c0
filemap_remove_folio+0x41/0xd0
remove_inode_hugepages+0x142/0x250
hugetlbfs_fallocate+0x471/0x5a0
vfs_fallocate+0x149/0x380
Hold folio lock before checking if the folio is mapped to avold race with
migration.
Link: https://lkml.kernel.org/r/20250912074139.3575005-1-tujinjiang@huawei.com
Fixes: 4aae8d1c051e ("mm/hugetlbfs: unmap pages if page fault raced with hole punch")
Signed-off-by: Jinjiang Tu <tujinjiang(a)huawei.com>
Cc: David Hildenbrand <david(a)redhat.com>
Cc: Kefeng Wang <wangkefeng.wang(a)huawei.com>
Cc: Matthew Wilcox (Oracle) <willy(a)infradead.org>
Cc: Muchun Song <muchun.song(a)linux.dev>
Cc: Oscar Salvador <osalvador(a)suse.de>
Cc: <stable(a)vger.kernel.org>
Signed-off-by: Andrew Morton <akpm(a)linux-foundation.org>
diff --git a/fs/hugetlbfs/inode.c b/fs/hugetlbfs/inode.c
index 09d4baef29cf..be4be99304bc 100644
--- a/fs/hugetlbfs/inode.c
+++ b/fs/hugetlbfs/inode.c
@@ -517,14 +517,16 @@ static bool remove_inode_single_folio(struct hstate *h, struct inode *inode,
/*
* If folio is mapped, it was faulted in after being
- * unmapped in caller. Unmap (again) while holding
- * the fault mutex. The mutex will prevent faults
- * until we finish removing the folio.
+ * unmapped in caller or hugetlb_vmdelete_list() skips
+ * unmapping it due to fail to grab lock. Unmap (again)
+ * while holding the fault mutex. The mutex will prevent
+ * faults until we finish removing the folio. Hold folio
+ * lock to guarantee no concurrent migration.
*/
+ folio_lock(folio);
if (unlikely(folio_mapped(folio)))
hugetlb_unmap_file_folio(h, mapping, folio, index);
- folio_lock(folio);
/*
* We must remove the folio from page cache before removing
* the region/ reserve map (hugetlb_unreserve_pages). In
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The patch titled
Subject: mm: hugetlb: avoid soft lockup when mprotect to large memory area
has been added to the -mm mm-hotfixes-unstable branch. Its filename is
mm-hugetlb-avoid-soft-lockup-when-mprotect-to-large-memory-area.patch
This patch will shortly appear at
https://git.kernel.org/pub/scm/linux/kernel/git/akpm/25-new.git/tree/patche…
This patch will later appear in the mm-hotfixes-unstable branch at
git://git.kernel.org/pub/scm/linux/kernel/git/akpm/mm
Before you just go and hit "reply", please:
a) Consider who else should be cc'ed
b) Prefer to cc a suitable mailing list as well
c) Ideally: find the original patch on the mailing list and do a
reply-to-all to that, adding suitable additional cc's
*** Remember to use Documentation/process/submit-checklist.rst when testing your code ***
The -mm tree is included into linux-next via the mm-everything
branch at git://git.kernel.org/pub/scm/linux/kernel/git/akpm/mm
and is updated there every 2-3 working days
------------------------------------------------------
From: Yang Shi <yang(a)os.amperecomputing.com>
Subject: mm: hugetlb: avoid soft lockup when mprotect to large memory area
Date: Mon, 29 Sep 2025 13:24:02 -0700
When calling mprotect() to a large hugetlb memory area in our customer's
workload (~300GB hugetlb memory), soft lockup was observed:
watchdog: BUG: soft lockup - CPU#98 stuck for 23s! [t2_new_sysv:126916]
CPU: 98 PID: 126916 Comm: t2_new_sysv Kdump: loaded Not tainted 6.17-rc7
Hardware name: GIGACOMPUTING R2A3-T40-AAV1/Jefferson CIO, BIOS 5.4.4.1 07/15/2025
pstate: 20400009 (nzCv daif +PAN -UAO -TCO -DIT -SSBS BTYPE=--)
pc��: mte_clear_page_tags+0x14/0x24
lr��: mte_sync_tags+0x1c0/0x240
sp��: ffff80003150bb80
x29: ffff80003150bb80 x28: ffff00739e9705a8 x27: 0000ffd2d6a00000
x26: 0000ff8e4bc00000 x25: 00e80046cde00f45 x24: 0000000000022458
x23: 0000000000000000 x22: 0000000000000004 x21: 000000011b380000
x20: ffff000000000000 x19: 000000011b379f40 x18: 0000000000000000
x17: 0000000000000000 x16: 0000000000000000 x15: 0000000000000000
x14: 0000000000000000 x13: 0000000000000000 x12: 0000000000000000
x11: 0000000000000000 x10: 0000000000000000 x9 : ffffc875e0aa5e2c
x8��: 0000000000000000 x7 : 0000000000000000 x6 : 0000000000000000
x5��: fffffc01ce7a5c00 x4 : 00000000046cde00 x3 : fffffc0000000000
x2��: 0000000000000004 x1 : 0000000000000040 x0 : ffff0046cde7c000
Call trace:
����mte_clear_page_tags+0x14/0x24
����set_huge_pte_at+0x25c/0x280
����hugetlb_change_protection+0x220/0x430
����change_protection+0x5c/0x8c
����mprotect_fixup+0x10c/0x294
����do_mprotect_pkey.constprop.0+0x2e0/0x3d4
����__arm64_sys_mprotect+0x24/0x44
����invoke_syscall+0x50/0x160
����el0_svc_common+0x48/0x144
����do_el0_svc+0x30/0xe0
����el0_svc+0x30/0xf0
����el0t_64_sync_handler+0xc4/0x148
����el0t_64_sync+0x1a4/0x1a8
Soft lockup is not triggered with THP or base page because there is
cond_resched() called for each PMD size.
Although the soft lockup was triggered by MTE, it should be not MTE
specific. The other processing which takes long time in the loop may
trigger soft lockup too.
So add cond_resched() for hugetlb to avoid soft lockup.
Link: https://lkml.kernel.org/r/20250929202402.1663290-1-yang@os.amperecomputing.…
Fixes: 8f860591ffb2 ("[PATCH] Enable mprotect on huge pages")
Signed-off-by: Yang Shi <yang(a)os.amperecomputing.com>
Tested-by: Carl Worth <carl(a)os.amperecomputing.com>
Reviewed-by: Christoph Lameter (Ampere) <cl(a)gentwo.org>
Reviewed-by: Catalin Marinas <catalin.marinas(a)arm.com>
Acked-by: David Hildenbrand <david(a)redhat.com>
Acked-by: Oscar Salvador <osalvador(a)suse.de>
Reviewed-by: Anshuman Khandual <anshuman.khandual(a)arm.com>
Cc: Muchun Song <muchun.song(a)linux.dev>
Cc: Will Deacon <will(a)kernel.org>
Cc: <stable(a)vger.kernel.org>
Signed-off-by: Andrew Morton <akpm(a)linux-foundation.org>
---
mm/hugetlb.c | 2 ++
1 file changed, 2 insertions(+)
--- a/mm/hugetlb.c~mm-hugetlb-avoid-soft-lockup-when-mprotect-to-large-memory-area
+++ a/mm/hugetlb.c
@@ -7203,6 +7203,8 @@ long hugetlb_change_protection(struct vm
psize);
}
spin_unlock(ptl);
+
+ cond_resched();
}
/*
* Must flush TLB before releasing i_mmap_rwsem: x86's huge_pmd_unshare
_
Patches currently in -mm which might be from yang(a)os.amperecomputing.com are
mm-hugetlb-avoid-soft-lockup-when-mprotect-to-large-memory-area.patch
The patch below does not apply to the 5.10-stable tree.
If someone wants it applied there, or to any other stable or longterm
tree, then please email the backport, including the original git commit
id to <stable(a)vger.kernel.org>.
To reproduce the conflict and resubmit, you may use the following commands:
git fetch https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git/ linux-5.10.y
git checkout FETCH_HEAD
git cherry-pick -x 7b7387650dcf2881fd8bb55bcf3c8bd6c9542dd7
# <resolve conflicts, build, test, etc.>
git commit -s
git send-email --to '<stable(a)vger.kernel.org>' --in-reply-to '2025092931-vastness-jawed-6945@gregkh' --subject-prefix 'PATCH 5.10.y' HEAD^..
Possible dependencies:
thanks,
greg k-h
------------------ original commit in Linus's tree ------------------
From 7b7387650dcf2881fd8bb55bcf3c8bd6c9542dd7 Mon Sep 17 00:00:00 2001
From: Jinjiang Tu <tujinjiang(a)huawei.com>
Date: Fri, 12 Sep 2025 15:41:39 +0800
Subject: [PATCH] mm/hugetlb: fix folio is still mapped when deleted
Migration may be raced with fallocating hole. remove_inode_single_folio
will unmap the folio if the folio is still mapped. However, it's called
without folio lock. If the folio is migrated and the mapped pte has been
converted to migration entry, folio_mapped() returns false, and won't
unmap it. Due to extra refcount held by remove_inode_single_folio,
migration fails, restores migration entry to normal pte, and the folio is
mapped again. As a result, we triggered BUG in filemap_unaccount_folio.
The log is as follows:
BUG: Bad page cache in process hugetlb pfn:156c00
page: refcount:515 mapcount:0 mapping:0000000099fef6e1 index:0x0 pfn:0x156c00
head: order:9 mapcount:1 entire_mapcount:1 nr_pages_mapped:0 pincount:0
aops:hugetlbfs_aops ino:dcc dentry name(?):"my_hugepage_file"
flags: 0x17ffffc00000c1(locked|waiters|head|node=0|zone=2|lastcpupid=0x1fffff)
page_type: f4(hugetlb)
page dumped because: still mapped when deleted
CPU: 1 UID: 0 PID: 395 Comm: hugetlb Not tainted 6.17.0-rc5-00044-g7aac71907bde-dirty #484 NONE
Hardware name: QEMU Ubuntu 24.04 PC (i440FX + PIIX, 1996), BIOS 0.0.0 02/06/2015
Call Trace:
<TASK>
dump_stack_lvl+0x4f/0x70
filemap_unaccount_folio+0xc4/0x1c0
__filemap_remove_folio+0x38/0x1c0
filemap_remove_folio+0x41/0xd0
remove_inode_hugepages+0x142/0x250
hugetlbfs_fallocate+0x471/0x5a0
vfs_fallocate+0x149/0x380
Hold folio lock before checking if the folio is mapped to avold race with
migration.
Link: https://lkml.kernel.org/r/20250912074139.3575005-1-tujinjiang@huawei.com
Fixes: 4aae8d1c051e ("mm/hugetlbfs: unmap pages if page fault raced with hole punch")
Signed-off-by: Jinjiang Tu <tujinjiang(a)huawei.com>
Cc: David Hildenbrand <david(a)redhat.com>
Cc: Kefeng Wang <wangkefeng.wang(a)huawei.com>
Cc: Matthew Wilcox (Oracle) <willy(a)infradead.org>
Cc: Muchun Song <muchun.song(a)linux.dev>
Cc: Oscar Salvador <osalvador(a)suse.de>
Cc: <stable(a)vger.kernel.org>
Signed-off-by: Andrew Morton <akpm(a)linux-foundation.org>
diff --git a/fs/hugetlbfs/inode.c b/fs/hugetlbfs/inode.c
index 09d4baef29cf..be4be99304bc 100644
--- a/fs/hugetlbfs/inode.c
+++ b/fs/hugetlbfs/inode.c
@@ -517,14 +517,16 @@ static bool remove_inode_single_folio(struct hstate *h, struct inode *inode,
/*
* If folio is mapped, it was faulted in after being
- * unmapped in caller. Unmap (again) while holding
- * the fault mutex. The mutex will prevent faults
- * until we finish removing the folio.
+ * unmapped in caller or hugetlb_vmdelete_list() skips
+ * unmapping it due to fail to grab lock. Unmap (again)
+ * while holding the fault mutex. The mutex will prevent
+ * faults until we finish removing the folio. Hold folio
+ * lock to guarantee no concurrent migration.
*/
+ folio_lock(folio);
if (unlikely(folio_mapped(folio)))
hugetlb_unmap_file_folio(h, mapping, folio, index);
- folio_lock(folio);
/*
* We must remove the folio from page cache before removing
* the region/ reserve map (hugetlb_unreserve_pages). In
The patch below does not apply to the 5.15-stable tree.
If someone wants it applied there, or to any other stable or longterm
tree, then please email the backport, including the original git commit
id to <stable(a)vger.kernel.org>.
To reproduce the conflict and resubmit, you may use the following commands:
git fetch https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git/ linux-5.15.y
git checkout FETCH_HEAD
git cherry-pick -x 7b7387650dcf2881fd8bb55bcf3c8bd6c9542dd7
# <resolve conflicts, build, test, etc.>
git commit -s
git send-email --to '<stable(a)vger.kernel.org>' --in-reply-to '2025092930-header-irritable-c8ed@gregkh' --subject-prefix 'PATCH 5.15.y' HEAD^..
Possible dependencies:
thanks,
greg k-h
------------------ original commit in Linus's tree ------------------
From 7b7387650dcf2881fd8bb55bcf3c8bd6c9542dd7 Mon Sep 17 00:00:00 2001
From: Jinjiang Tu <tujinjiang(a)huawei.com>
Date: Fri, 12 Sep 2025 15:41:39 +0800
Subject: [PATCH] mm/hugetlb: fix folio is still mapped when deleted
Migration may be raced with fallocating hole. remove_inode_single_folio
will unmap the folio if the folio is still mapped. However, it's called
without folio lock. If the folio is migrated and the mapped pte has been
converted to migration entry, folio_mapped() returns false, and won't
unmap it. Due to extra refcount held by remove_inode_single_folio,
migration fails, restores migration entry to normal pte, and the folio is
mapped again. As a result, we triggered BUG in filemap_unaccount_folio.
The log is as follows:
BUG: Bad page cache in process hugetlb pfn:156c00
page: refcount:515 mapcount:0 mapping:0000000099fef6e1 index:0x0 pfn:0x156c00
head: order:9 mapcount:1 entire_mapcount:1 nr_pages_mapped:0 pincount:0
aops:hugetlbfs_aops ino:dcc dentry name(?):"my_hugepage_file"
flags: 0x17ffffc00000c1(locked|waiters|head|node=0|zone=2|lastcpupid=0x1fffff)
page_type: f4(hugetlb)
page dumped because: still mapped when deleted
CPU: 1 UID: 0 PID: 395 Comm: hugetlb Not tainted 6.17.0-rc5-00044-g7aac71907bde-dirty #484 NONE
Hardware name: QEMU Ubuntu 24.04 PC (i440FX + PIIX, 1996), BIOS 0.0.0 02/06/2015
Call Trace:
<TASK>
dump_stack_lvl+0x4f/0x70
filemap_unaccount_folio+0xc4/0x1c0
__filemap_remove_folio+0x38/0x1c0
filemap_remove_folio+0x41/0xd0
remove_inode_hugepages+0x142/0x250
hugetlbfs_fallocate+0x471/0x5a0
vfs_fallocate+0x149/0x380
Hold folio lock before checking if the folio is mapped to avold race with
migration.
Link: https://lkml.kernel.org/r/20250912074139.3575005-1-tujinjiang@huawei.com
Fixes: 4aae8d1c051e ("mm/hugetlbfs: unmap pages if page fault raced with hole punch")
Signed-off-by: Jinjiang Tu <tujinjiang(a)huawei.com>
Cc: David Hildenbrand <david(a)redhat.com>
Cc: Kefeng Wang <wangkefeng.wang(a)huawei.com>
Cc: Matthew Wilcox (Oracle) <willy(a)infradead.org>
Cc: Muchun Song <muchun.song(a)linux.dev>
Cc: Oscar Salvador <osalvador(a)suse.de>
Cc: <stable(a)vger.kernel.org>
Signed-off-by: Andrew Morton <akpm(a)linux-foundation.org>
diff --git a/fs/hugetlbfs/inode.c b/fs/hugetlbfs/inode.c
index 09d4baef29cf..be4be99304bc 100644
--- a/fs/hugetlbfs/inode.c
+++ b/fs/hugetlbfs/inode.c
@@ -517,14 +517,16 @@ static bool remove_inode_single_folio(struct hstate *h, struct inode *inode,
/*
* If folio is mapped, it was faulted in after being
- * unmapped in caller. Unmap (again) while holding
- * the fault mutex. The mutex will prevent faults
- * until we finish removing the folio.
+ * unmapped in caller or hugetlb_vmdelete_list() skips
+ * unmapping it due to fail to grab lock. Unmap (again)
+ * while holding the fault mutex. The mutex will prevent
+ * faults until we finish removing the folio. Hold folio
+ * lock to guarantee no concurrent migration.
*/
+ folio_lock(folio);
if (unlikely(folio_mapped(folio)))
hugetlb_unmap_file_folio(h, mapping, folio, index);
- folio_lock(folio);
/*
* We must remove the folio from page cache before removing
* the region/ reserve map (hugetlb_unreserve_pages). In
The patch below does not apply to the 6.1-stable tree.
If someone wants it applied there, or to any other stable or longterm
tree, then please email the backport, including the original git commit
id to <stable(a)vger.kernel.org>.
To reproduce the conflict and resubmit, you may use the following commands:
git fetch https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git/ linux-6.1.y
git checkout FETCH_HEAD
git cherry-pick -x 85e1ff61060a765d91ee62dc5606d4d547d9d105
# <resolve conflicts, build, test, etc.>
git commit -s
git send-email --to '<stable(a)vger.kernel.org>' --in-reply-to '2025092954-dance-oat-7fae@gregkh' --subject-prefix 'PATCH 6.1.y' HEAD^..
Possible dependencies:
thanks,
greg k-h
------------------ original commit in Linus's tree ------------------
From 85e1ff61060a765d91ee62dc5606d4d547d9d105 Mon Sep 17 00:00:00 2001
From: Eric Biggers <ebiggers(a)kernel.org>
Date: Thu, 11 Sep 2025 12:58:58 -0700
Subject: [PATCH] kmsan: fix out-of-bounds access to shadow memory
Running sha224_kunit on a KMSAN-enabled kernel results in a crash in
kmsan_internal_set_shadow_origin():
BUG: unable to handle page fault for address: ffffbc3840291000
#PF: supervisor read access in kernel mode
#PF: error_code(0x0000) - not-present page
PGD 1810067 P4D 1810067 PUD 192d067 PMD 3c17067 PTE 0
Oops: 0000 [#1] SMP NOPTI
CPU: 0 UID: 0 PID: 81 Comm: kunit_try_catch Tainted: G N 6.17.0-rc3 #10 PREEMPT(voluntary)
Tainted: [N]=TEST
Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS rel-1.17.0-0-gb52ca86e094d-prebuilt.qemu.org 04/01/2014
RIP: 0010:kmsan_internal_set_shadow_origin+0x91/0x100
[...]
Call Trace:
<TASK>
__msan_memset+0xee/0x1a0
sha224_final+0x9e/0x350
test_hash_buffer_overruns+0x46f/0x5f0
? kmsan_get_shadow_origin_ptr+0x46/0xa0
? __pfx_test_hash_buffer_overruns+0x10/0x10
kunit_try_run_case+0x198/0xa00
This occurs when memset() is called on a buffer that is not 4-byte aligned
and extends to the end of a guard page, i.e. the next page is unmapped.
The bug is that the loop at the end of kmsan_internal_set_shadow_origin()
accesses the wrong shadow memory bytes when the address is not 4-byte
aligned. Since each 4 bytes are associated with an origin, it rounds the
address and size so that it can access all the origins that contain the
buffer. However, when it checks the corresponding shadow bytes for a
particular origin, it incorrectly uses the original unrounded shadow
address. This results in reads from shadow memory beyond the end of the
buffer's shadow memory, which crashes when that memory is not mapped.
To fix this, correctly align the shadow address before accessing the 4
shadow bytes corresponding to each origin.
Link: https://lkml.kernel.org/r/20250911195858.394235-1-ebiggers@kernel.org
Fixes: 2ef3cec44c60 ("kmsan: do not wipe out origin when doing partial unpoisoning")
Signed-off-by: Eric Biggers <ebiggers(a)kernel.org>
Tested-by: Alexander Potapenko <glider(a)google.com>
Reviewed-by: Alexander Potapenko <glider(a)google.com>
Cc: Dmitriy Vyukov <dvyukov(a)google.com>
Cc: Marco Elver <elver(a)google.com>
Cc: <stable(a)vger.kernel.org>
Signed-off-by: Andrew Morton <akpm(a)linux-foundation.org>
diff --git a/mm/kmsan/core.c b/mm/kmsan/core.c
index 1ea711786c52..8bca7fece47f 100644
--- a/mm/kmsan/core.c
+++ b/mm/kmsan/core.c
@@ -195,7 +195,8 @@ void kmsan_internal_set_shadow_origin(void *addr, size_t size, int b,
u32 origin, bool checked)
{
u64 address = (u64)addr;
- u32 *shadow_start, *origin_start;
+ void *shadow_start;
+ u32 *aligned_shadow, *origin_start;
size_t pad = 0;
KMSAN_WARN_ON(!kmsan_metadata_is_contiguous(addr, size));
@@ -214,9 +215,12 @@ void kmsan_internal_set_shadow_origin(void *addr, size_t size, int b,
}
__memset(shadow_start, b, size);
- if (!IS_ALIGNED(address, KMSAN_ORIGIN_SIZE)) {
+ if (IS_ALIGNED(address, KMSAN_ORIGIN_SIZE)) {
+ aligned_shadow = shadow_start;
+ } else {
pad = address % KMSAN_ORIGIN_SIZE;
address -= pad;
+ aligned_shadow = shadow_start - pad;
size += pad;
}
size = ALIGN(size, KMSAN_ORIGIN_SIZE);
@@ -230,7 +234,7 @@ void kmsan_internal_set_shadow_origin(void *addr, size_t size, int b,
* corresponding shadow slot is zero.
*/
for (int i = 0; i < size / KMSAN_ORIGIN_SIZE; i++) {
- if (origin || !shadow_start[i])
+ if (origin || !aligned_shadow[i])
origin_start[i] = origin;
}
}
diff --git a/mm/kmsan/kmsan_test.c b/mm/kmsan/kmsan_test.c
index c6c5b2bbede0..902ec48b1e3e 100644
--- a/mm/kmsan/kmsan_test.c
+++ b/mm/kmsan/kmsan_test.c
@@ -556,6 +556,21 @@ DEFINE_TEST_MEMSETXX(16)
DEFINE_TEST_MEMSETXX(32)
DEFINE_TEST_MEMSETXX(64)
+/* Test case: ensure that KMSAN does not access shadow memory out of bounds. */
+static void test_memset_on_guarded_buffer(struct kunit *test)
+{
+ void *buf = vmalloc(PAGE_SIZE);
+
+ kunit_info(test,
+ "memset() on ends of guarded buffer should not crash\n");
+
+ for (size_t size = 0; size <= 128; size++) {
+ memset(buf, 0xff, size);
+ memset(buf + PAGE_SIZE - size, 0xff, size);
+ }
+ vfree(buf);
+}
+
static noinline void fibonacci(int *array, int size, int start)
{
if (start < 2 || (start == size))
@@ -677,6 +692,7 @@ static struct kunit_case kmsan_test_cases[] = {
KUNIT_CASE(test_memset16),
KUNIT_CASE(test_memset32),
KUNIT_CASE(test_memset64),
+ KUNIT_CASE(test_memset_on_guarded_buffer),
KUNIT_CASE(test_long_origin_chain),
KUNIT_CASE(test_stackdepot_roundtrip),
KUNIT_CASE(test_unpoison_memory),
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Please reply with REMOVE if you don't wish to receive further emails
The patch below does not apply to the 6.6-stable tree.
If someone wants it applied there, or to any other stable or longterm
tree, then please email the backport, including the original git commit
id to <stable(a)vger.kernel.org>.
To reproduce the conflict and resubmit, you may use the following commands:
git fetch https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git/ linux-6.6.y
git checkout FETCH_HEAD
git cherry-pick -x c6ccc4dde17676dfe617b9a37bd9ba19a8fc87ee
# <resolve conflicts, build, test, etc.>
git commit -s
git send-email --to '<stable(a)vger.kernel.org>' --in-reply-to '2025092939-unsafe-alfalfa-105c@gregkh' --subject-prefix 'PATCH 6.6.y' HEAD^..
Possible dependencies:
thanks,
greg k-h
------------------ original commit in Linus's tree ------------------
From c6ccc4dde17676dfe617b9a37bd9ba19a8fc87ee Mon Sep 17 00:00:00 2001
From: Hans de Goede <hansg(a)kernel.org>
Date: Sat, 20 Sep 2025 22:09:55 +0200
Subject: [PATCH] gpiolib: Extend software-node support to support secondary
software-nodes
When a software-node gets added to a device which already has another
fwnode as primary node it will become the secondary fwnode for that
device.
Currently if a software-node with GPIO properties ends up as the secondary
fwnode then gpiod_find_by_fwnode() will fail to find the GPIOs.
Add a new gpiod_fwnode_lookup() helper which falls back to calling
gpiod_find_by_fwnode() with the secondary fwnode if the GPIO was not
found in the primary fwnode.
Fixes: e7f9ff5dc90c ("gpiolib: add support for software nodes")
Cc: stable(a)vger.kernel.org
Signed-off-by: Hans de Goede <hansg(a)kernel.org>
Reviewed-by: Dmitry Torokhov <dmitry.torokhov(a)gmail.com>
Link: https://lore.kernel.org/r/20250920200955.20403-1-hansg@kernel.org
Signed-off-by: Bartosz Golaszewski <bartosz.golaszewski(a)linaro.org>
diff --git a/drivers/gpio/gpiolib.c b/drivers/gpio/gpiolib.c
index 0d2b470a252e..74d54513730a 100644
--- a/drivers/gpio/gpiolib.c
+++ b/drivers/gpio/gpiolib.c
@@ -4604,6 +4604,23 @@ static struct gpio_desc *gpiod_find_by_fwnode(struct fwnode_handle *fwnode,
return desc;
}
+static struct gpio_desc *gpiod_fwnode_lookup(struct fwnode_handle *fwnode,
+ struct device *consumer,
+ const char *con_id,
+ unsigned int idx,
+ enum gpiod_flags *flags,
+ unsigned long *lookupflags)
+{
+ struct gpio_desc *desc;
+
+ desc = gpiod_find_by_fwnode(fwnode, consumer, con_id, idx, flags, lookupflags);
+ if (gpiod_not_found(desc) && !IS_ERR_OR_NULL(fwnode))
+ desc = gpiod_find_by_fwnode(fwnode->secondary, consumer, con_id,
+ idx, flags, lookupflags);
+
+ return desc;
+}
+
struct gpio_desc *gpiod_find_and_request(struct device *consumer,
struct fwnode_handle *fwnode,
const char *con_id,
@@ -4622,8 +4639,8 @@ struct gpio_desc *gpiod_find_and_request(struct device *consumer,
int ret = 0;
scoped_guard(srcu, &gpio_devices_srcu) {
- desc = gpiod_find_by_fwnode(fwnode, consumer, con_id, idx,
- &flags, &lookupflags);
+ desc = gpiod_fwnode_lookup(fwnode, consumer, con_id, idx,
+ &flags, &lookupflags);
if (gpiod_not_found(desc) && platform_lookup_allowed) {
/*
* Either we are not using DT or ACPI, or their lookup
This series backports 19 patches to update minmax.h in the 6.1.y branch,
aligning it with v6.17-rc7.
The ultimate goal is to synchronize all longterm branches so that they
include the full set of minmax.h changes.
Previous work to update 6.12.48:
https://lore.kernel.org/stable/20250922103123.14538-1-farbere@amazon.com/T/…
and 6.6.107:
https://lore.kernel.org/stable/20250922103241.16213-1-farbere@amazon.com/T/…
The key motivation is to bring in commit d03eba99f5bf ("minmax: allow
min()/max()/clamp() if the arguments have the same signedness"), which
is missing in older kernels.
In mainline, this change enables min()/max()/clamp() to accept mixed
argument types, provided both have the same signedness. Without it,
backported patches that use these forms may trigger compiler warnings,
which escalate to build failures when -Werror is enabled.
Andy Shevchenko (1):
minmax: deduplicate __unconst_integer_typeof()
David Laight (8):
minmax: fix indentation of __cmp_once() and __clamp_once()
minmax.h: add whitespace around operators and after commas
minmax.h: update some comments
minmax.h: reduce the #define expansion of min(), max() and clamp()
minmax.h: use BUILD_BUG_ON_MSG() for the lo < hi test in clamp()
minmax.h: move all the clamp() definitions after the min/max() ones
minmax.h: simplify the variants of clamp()
minmax.h: remove some #defines that are only expanded once
Herve Codina (1):
minmax: Introduce {min,max}_array()
Linus Torvalds (8):
minmax: avoid overly complicated constant expressions in VM code
minmax: simplify and clarify min_t()/max_t() implementation
minmax: make generic MIN() and MAX() macros available everywhere
minmax: add a few more MIN_T/MAX_T users
minmax: simplify min()/max()/clamp() implementation
minmax: don't use max() in situations that want a C constant
expression
minmax: improve macro expansion and type checking
minmax: fix up min3() and max3() too
Matthew Wilcox (Oracle) (1):
minmax: add in_range() macro
arch/arm/mm/pageattr.c | 6 +-
arch/um/drivers/mconsole_user.c | 2 +
arch/x86/mm/pgtable.c | 2 +-
drivers/edac/sb_edac.c | 4 +-
drivers/edac/skx_common.h | 1 -
.../drm/amd/display/modules/hdcp/hdcp_ddc.c | 2 +
.../drm/amd/pm/powerplay/hwmgr/ppevvmath.h | 14 +-
drivers/gpu/drm/amd/pm/swsmu/smu_cmn.c | 2 +-
.../drm/arm/display/include/malidp_utils.h | 2 +-
.../display/komeda/komeda_pipeline_state.c | 24 +-
drivers/gpu/drm/drm_color_mgmt.c | 2 +-
drivers/gpu/drm/msm/adreno/a6xx_gmu.c | 6 -
drivers/gpu/drm/radeon/evergreen_cs.c | 2 +
drivers/hwmon/adt7475.c | 24 +-
drivers/input/touchscreen/cyttsp4_core.c | 2 +-
drivers/irqchip/irq-sun6i-r.c | 2 +-
drivers/md/dm-integrity.c | 2 +-
drivers/media/dvb-frontends/stv0367_priv.h | 3 +
.../net/ethernet/chelsio/cxgb3/cxgb3_main.c | 18 +-
.../net/ethernet/stmicro/stmmac/stmmac_main.c | 2 +-
drivers/net/fjes/fjes_main.c | 4 +-
drivers/nfc/pn544/i2c.c | 2 -
drivers/platform/x86/sony-laptop.c | 1 -
drivers/scsi/isci/init.c | 6 +-
.../pci/hive_isp_css_include/math_support.h | 5 -
drivers/virt/acrn/ioreq.c | 4 +-
fs/btrfs/misc.h | 2 -
fs/btrfs/tree-checker.c | 2 +-
fs/ext2/balloc.c | 2 -
fs/ext4/ext4.h | 2 -
fs/ufs/util.h | 6 -
include/linux/compiler.h | 9 +
include/linux/minmax.h | 264 +++++++++++++-----
include/linux/pageblock-flags.h | 2 +-
kernel/trace/preemptirq_delay_test.c | 2 -
lib/btree.c | 1 -
lib/decompress_unlzma.c | 2 +
lib/logic_pio.c | 3 -
lib/vsprintf.c | 2 +-
mm/zsmalloc.c | 1 -
net/ipv4/proc.c | 2 +-
net/ipv6/proc.c | 2 +-
net/netfilter/nf_nat_core.c | 6 +-
net/tipc/core.h | 2 +-
net/tipc/link.c | 10 +-
.../selftests/bpf/progs/get_branch_snapshot.c | 4 +-
tools/testing/selftests/seccomp/seccomp_bpf.c | 2 +
tools/testing/selftests/vm/mremap_test.c | 2 +
48 files changed, 290 insertions(+), 184 deletions(-)
--
2.47.3
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If you don’t want to receive further email revert back as “ Take Out”
The patch below does not apply to the 6.12-stable tree.
If someone wants it applied there, or to any other stable or longterm
tree, then please email the backport, including the original git commit
id to <stable(a)vger.kernel.org>.
To reproduce the conflict and resubmit, you may use the following commands:
git fetch https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git/ linux-6.12.y
git checkout FETCH_HEAD
git cherry-pick -x 4e034bf045b12852a24d5d33f2451850818ba0c1
# <resolve conflicts, build, test, etc.>
git commit -s
git send-email --to '<stable(a)vger.kernel.org>' --in-reply-to '2025092933-conform-unclaimed-d167@gregkh' --subject-prefix 'PATCH 6.12.y' HEAD^..
Possible dependencies:
thanks,
greg k-h
------------------ original commit in Linus's tree ------------------
From 4e034bf045b12852a24d5d33f2451850818ba0c1 Mon Sep 17 00:00:00 2001
From: Jason Gunthorpe <jgg(a)ziepe.ca>
Date: Tue, 16 Sep 2025 20:47:10 -0300
Subject: [PATCH] iommufd: Fix race during abort for file descriptors
fput() doesn't actually call file_operations release() synchronously, it
puts the file on a work queue and it will be released eventually.
This is normally fine, except for iommufd the file and the iommufd_object
are tied to gether. The file has the object as it's private_data and holds
a users refcount, while the object is expected to remain alive as long as
the file is.
When the allocation of a new object aborts before installing the file it
will fput() the file and then go on to immediately kfree() the obj. This
causes a UAF once the workqueue completes the fput() and tries to
decrement the users refcount.
Fix this by putting the core code in charge of the file lifetime, and call
__fput_sync() during abort to ensure that release() is called before
kfree. __fput_sync() is a bit too tricky to open code in all the object
implementations. Instead the objects tell the core code where the file
pointer is and the core will take care of the life cycle.
If the object is successfully allocated then the file will hold a users
refcount and the iommufd_object cannot be destroyed.
It is worth noting that close(); ioctl(IOMMU_DESTROY); doesn't have an
issue because close() is already using a synchronous version of fput().
The UAF looks like this:
BUG: KASAN: slab-use-after-free in iommufd_eventq_fops_release+0x45/0xc0 drivers/iommu/iommufd/eventq.c:376
Write of size 4 at addr ffff888059c97804 by task syz.0.46/6164
CPU: 0 UID: 0 PID: 6164 Comm: syz.0.46 Not tainted syzkaller #0 PREEMPT(full)
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 08/18/2025
Call Trace:
<TASK>
__dump_stack lib/dump_stack.c:94 [inline]
dump_stack_lvl+0x116/0x1f0 lib/dump_stack.c:120
print_address_description mm/kasan/report.c:378 [inline]
print_report+0xcd/0x630 mm/kasan/report.c:482
kasan_report+0xe0/0x110 mm/kasan/report.c:595
check_region_inline mm/kasan/generic.c:183 [inline]
kasan_check_range+0x100/0x1b0 mm/kasan/generic.c:189
instrument_atomic_read_write include/linux/instrumented.h:96 [inline]
atomic_fetch_sub_release include/linux/atomic/atomic-instrumented.h:400 [inline]
__refcount_dec include/linux/refcount.h:455 [inline]
refcount_dec include/linux/refcount.h:476 [inline]
iommufd_eventq_fops_release+0x45/0xc0 drivers/iommu/iommufd/eventq.c:376
__fput+0x402/0xb70 fs/file_table.c:468
task_work_run+0x14d/0x240 kernel/task_work.c:227
resume_user_mode_work include/linux/resume_user_mode.h:50 [inline]
exit_to_user_mode_loop+0xeb/0x110 kernel/entry/common.c:43
exit_to_user_mode_prepare include/linux/irq-entry-common.h:225 [inline]
syscall_exit_to_user_mode_work include/linux/entry-common.h:175 [inline]
syscall_exit_to_user_mode include/linux/entry-common.h:210 [inline]
do_syscall_64+0x41c/0x4c0 arch/x86/entry/syscall_64.c:100
entry_SYSCALL_64_after_hwframe+0x77/0x7f
Link: https://patch.msgid.link/r/1-v1-02cd136829df+31-iommufd_syz_fput_jgg@nvidia…
Cc: stable(a)vger.kernel.org
Fixes: 07838f7fd529 ("iommufd: Add iommufd fault object")
Reviewed-by: Nicolin Chen <nicolinc(a)nvidia.com>
Reviewed-by: Nirmoy Das <nirmoyd(a)nvidia.com>
Reviewed-by: Kevin Tian <kevin.tian(a)intel.com>
Tested-by: Nicolin Chen <nicolinc(a)nvidia.com>
Reported-by: syzbot+80620e2d0d0a33b09f93(a)syzkaller.appspotmail.com
Closes: https://lore.kernel.org/r/68c8583d.050a0220.2ff435.03a2.GAE@google.com
Signed-off-by: Jason Gunthorpe <jgg(a)nvidia.com>
diff --git a/drivers/iommu/iommufd/eventq.c b/drivers/iommu/iommufd/eventq.c
index fc4de63b0bce..e23d9ee4fe38 100644
--- a/drivers/iommu/iommufd/eventq.c
+++ b/drivers/iommu/iommufd/eventq.c
@@ -393,12 +393,12 @@ static int iommufd_eventq_init(struct iommufd_eventq *eventq, char *name,
const struct file_operations *fops)
{
struct file *filep;
- int fdno;
spin_lock_init(&eventq->lock);
INIT_LIST_HEAD(&eventq->deliver);
init_waitqueue_head(&eventq->wait_queue);
+ /* The filep is fput() by the core code during failure */
filep = anon_inode_getfile(name, fops, eventq, O_RDWR);
if (IS_ERR(filep))
return PTR_ERR(filep);
@@ -408,10 +408,7 @@ static int iommufd_eventq_init(struct iommufd_eventq *eventq, char *name,
eventq->filep = filep;
refcount_inc(&eventq->obj.users);
- fdno = get_unused_fd_flags(O_CLOEXEC);
- if (fdno < 0)
- fput(filep);
- return fdno;
+ return get_unused_fd_flags(O_CLOEXEC);
}
static const struct file_operations iommufd_fault_fops =
@@ -452,7 +449,6 @@ int iommufd_fault_alloc(struct iommufd_ucmd *ucmd)
return 0;
out_put_fdno:
put_unused_fd(fdno);
- fput(fault->common.filep);
return rc;
}
@@ -536,7 +532,6 @@ int iommufd_veventq_alloc(struct iommufd_ucmd *ucmd)
out_put_fdno:
put_unused_fd(fdno);
- fput(veventq->common.filep);
out_abort:
iommufd_object_abort_and_destroy(ucmd->ictx, &veventq->common.obj);
out_unlock_veventqs:
diff --git a/drivers/iommu/iommufd/main.c b/drivers/iommu/iommufd/main.c
index a9d4decc8ba1..88be2e157245 100644
--- a/drivers/iommu/iommufd/main.c
+++ b/drivers/iommu/iommufd/main.c
@@ -23,6 +23,7 @@
#include "iommufd_test.h"
struct iommufd_object_ops {
+ size_t file_offset;
void (*pre_destroy)(struct iommufd_object *obj);
void (*destroy)(struct iommufd_object *obj);
void (*abort)(struct iommufd_object *obj);
@@ -131,10 +132,30 @@ void iommufd_object_abort(struct iommufd_ctx *ictx, struct iommufd_object *obj)
void iommufd_object_abort_and_destroy(struct iommufd_ctx *ictx,
struct iommufd_object *obj)
{
- if (iommufd_object_ops[obj->type].abort)
- iommufd_object_ops[obj->type].abort(obj);
+ const struct iommufd_object_ops *ops = &iommufd_object_ops[obj->type];
+
+ if (ops->file_offset) {
+ struct file **filep = ((void *)obj) + ops->file_offset;
+
+ /*
+ * A file should hold a users refcount while the file is open
+ * and put it back in its release. The file should hold a
+ * pointer to obj in their private data. Normal fput() is
+ * deferred to a workqueue and can get out of order with the
+ * following kfree(obj). Using the sync version ensures the
+ * release happens immediately. During abort we require the file
+ * refcount is one at this point - meaning the object alloc
+ * function cannot do anything to allow another thread to take a
+ * refcount prior to a guaranteed success.
+ */
+ if (*filep)
+ __fput_sync(*filep);
+ }
+
+ if (ops->abort)
+ ops->abort(obj);
else
- iommufd_object_ops[obj->type].destroy(obj);
+ ops->destroy(obj);
iommufd_object_abort(ictx, obj);
}
@@ -659,6 +680,12 @@ void iommufd_ctx_put(struct iommufd_ctx *ictx)
}
EXPORT_SYMBOL_NS_GPL(iommufd_ctx_put, "IOMMUFD");
+#define IOMMUFD_FILE_OFFSET(_struct, _filep, _obj) \
+ .file_offset = (offsetof(_struct, _filep) + \
+ BUILD_BUG_ON_ZERO(!__same_type( \
+ struct file *, ((_struct *)NULL)->_filep)) + \
+ BUILD_BUG_ON_ZERO(offsetof(_struct, _obj)))
+
static const struct iommufd_object_ops iommufd_object_ops[] = {
[IOMMUFD_OBJ_ACCESS] = {
.destroy = iommufd_access_destroy_object,
@@ -669,6 +696,7 @@ static const struct iommufd_object_ops iommufd_object_ops[] = {
},
[IOMMUFD_OBJ_FAULT] = {
.destroy = iommufd_fault_destroy,
+ IOMMUFD_FILE_OFFSET(struct iommufd_fault, common.filep, common.obj),
},
[IOMMUFD_OBJ_HW_QUEUE] = {
.destroy = iommufd_hw_queue_destroy,
@@ -691,6 +719,7 @@ static const struct iommufd_object_ops iommufd_object_ops[] = {
[IOMMUFD_OBJ_VEVENTQ] = {
.destroy = iommufd_veventq_destroy,
.abort = iommufd_veventq_abort,
+ IOMMUFD_FILE_OFFSET(struct iommufd_veventq, common.filep, common.obj),
},
[IOMMUFD_OBJ_VIOMMU] = {
.destroy = iommufd_viommu_destroy,
The patch below does not apply to the 5.4-stable tree.
If someone wants it applied there, or to any other stable or longterm
tree, then please email the backport, including the original git commit
id to <stable(a)vger.kernel.org>.
To reproduce the conflict and resubmit, you may use the following commands:
git fetch https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git/ linux-5.4.y
git checkout FETCH_HEAD
git cherry-pick -x eac04428abe9f9cb203ffae4600791ea1d24eb18
# <resolve conflicts, build, test, etc.>
git commit -s
git send-email --to '<stable(a)vger.kernel.org>' --in-reply-to '2025092927-captivate-suspense-fdf7@gregkh' --subject-prefix 'PATCH 5.4.y' HEAD^..
Possible dependencies:
thanks,
greg k-h
------------------ original commit in Linus's tree ------------------
From eac04428abe9f9cb203ffae4600791ea1d24eb18 Mon Sep 17 00:00:00 2001
From: Lukasz Czapnik <lukasz.czapnik(a)intel.com>
Date: Wed, 13 Aug 2025 12:45:17 +0200
Subject: [PATCH] i40e: add mask to apply valid bits for itr_idx
The ITR index (itr_idx) is only 2 bits wide. When constructing the
register value for QINT_RQCTL, all fields are ORed together. Without
masking, higher bits from itr_idx may overwrite adjacent fields in the
register.
Apply I40E_QINT_RQCTL_ITR_INDX_MASK to ensure only the intended bits are
set.
Fixes: 5c3c48ac6bf5 ("i40e: implement virtual device interface")
Cc: stable(a)vger.kernel.org
Signed-off-by: Lukasz Czapnik <lukasz.czapnik(a)intel.com>
Reviewed-by: Aleksandr Loktionov <aleksandr.loktionov(a)intel.com>
Signed-off-by: Przemek Kitszel <przemyslaw.kitszel(a)intel.com>
Reviewed-by: Simon Horman <horms(a)kernel.org>
Tested-by: Rafal Romanowski <rafal.romanowski(a)intel.com>
Signed-off-by: Tony Nguyen <anthony.l.nguyen(a)intel.com>
diff --git a/drivers/net/ethernet/intel/i40e/i40e_virtchnl_pf.c b/drivers/net/ethernet/intel/i40e/i40e_virtchnl_pf.c
index f29941c00342..f9b2197f0942 100644
--- a/drivers/net/ethernet/intel/i40e/i40e_virtchnl_pf.c
+++ b/drivers/net/ethernet/intel/i40e/i40e_virtchnl_pf.c
@@ -448,7 +448,7 @@ static void i40e_config_irq_link_list(struct i40e_vf *vf, u16 vsi_id,
(qtype << I40E_QINT_RQCTL_NEXTQ_TYPE_SHIFT) |
(pf_queue_id << I40E_QINT_RQCTL_NEXTQ_INDX_SHIFT) |
BIT(I40E_QINT_RQCTL_CAUSE_ENA_SHIFT) |
- (itr_idx << I40E_QINT_RQCTL_ITR_INDX_SHIFT);
+ FIELD_PREP(I40E_QINT_RQCTL_ITR_INDX_MASK, itr_idx);
wr32(hw, reg_idx, reg);
}
The patch below does not apply to the 6.1-stable tree.
If someone wants it applied there, or to any other stable or longterm
tree, then please email the backport, including the original git commit
id to <stable(a)vger.kernel.org>.
To reproduce the conflict and resubmit, you may use the following commands:
git fetch https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git/ linux-6.1.y
git checkout FETCH_HEAD
git cherry-pick -x c7c31f8dc54aa3c9b2c994b5f1ff7e740a654e97
# <resolve conflicts, build, test, etc.>
git commit -s
git send-email --to '<stable(a)vger.kernel.org>' --in-reply-to '2025092921-consensus-mystified-6396@gregkh' --subject-prefix 'PATCH 6.1.y' HEAD^..
Possible dependencies:
thanks,
greg k-h
------------------ original commit in Linus's tree ------------------
From c7c31f8dc54aa3c9b2c994b5f1ff7e740a654e97 Mon Sep 17 00:00:00 2001
From: Nirmoy Das <nirmoyd(a)nvidia.com>
Date: Wed, 17 Sep 2025 12:43:46 -0700
Subject: [PATCH] drm/ast: Use msleep instead of mdelay for edid read
The busy-waiting in `mdelay()` can cause CPU stalls and kernel timeouts
during boot.
Signed-off-by: Nirmoy Das <nirmoyd(a)nvidia.com>
Reviewed-by: Thomas Zimmermann <tzimmermann(a)suse.de>
Tested-by: Carol L Soto csoto(a)nvidia.com<mailto:csoto@nvidia.com>
Fixes: 594e9c04b586 ("drm/ast: Create the driver for ASPEED proprietory Display-Port")
Cc: KuoHsiang Chou <kuohsiang_chou(a)aspeedtech.com>
Cc: Thomas Zimmermann <tzimmermann(a)suse.de>
Cc: Dave Airlie <airlied(a)redhat.com>
Cc: Jocelyn Falempe <jfalempe(a)redhat.com>
Cc: dri-devel(a)lists.freedesktop.org
Cc: <stable(a)vger.kernel.org> # v5.19+
Signed-off-by: Thomas Zimmermann <tzimmermann(a)suse.de>
Link: https://lore.kernel.org/r/20250917194346.2905522-1-nirmoyd@nvidia.com
diff --git a/drivers/gpu/drm/ast/ast_dp.c b/drivers/gpu/drm/ast/ast_dp.c
index 19c04687b0fe..8e650a02c528 100644
--- a/drivers/gpu/drm/ast/ast_dp.c
+++ b/drivers/gpu/drm/ast/ast_dp.c
@@ -134,7 +134,7 @@ static int ast_astdp_read_edid_block(void *data, u8 *buf, unsigned int block, si
* 3. The Delays are often longer a lot when system resume from S3/S4.
*/
if (j)
- mdelay(j + 1);
+ msleep(j + 1);
/* Wait for EDID offset to show up in mirror register */
vgacrd7 = ast_get_index_reg(ast, AST_IO_VGACRI, 0xd7);
The patch below does not apply to the 6.6-stable tree.
If someone wants it applied there, or to any other stable or longterm
tree, then please email the backport, including the original git commit
id to <stable(a)vger.kernel.org>.
To reproduce the conflict and resubmit, you may use the following commands:
git fetch https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git/ linux-6.6.y
git checkout FETCH_HEAD
git cherry-pick -x c7c31f8dc54aa3c9b2c994b5f1ff7e740a654e97
# <resolve conflicts, build, test, etc.>
git commit -s
git send-email --to '<stable(a)vger.kernel.org>' --in-reply-to '2025092920-backspin-glade-7b6c@gregkh' --subject-prefix 'PATCH 6.6.y' HEAD^..
Possible dependencies:
thanks,
greg k-h
------------------ original commit in Linus's tree ------------------
From c7c31f8dc54aa3c9b2c994b5f1ff7e740a654e97 Mon Sep 17 00:00:00 2001
From: Nirmoy Das <nirmoyd(a)nvidia.com>
Date: Wed, 17 Sep 2025 12:43:46 -0700
Subject: [PATCH] drm/ast: Use msleep instead of mdelay for edid read
The busy-waiting in `mdelay()` can cause CPU stalls and kernel timeouts
during boot.
Signed-off-by: Nirmoy Das <nirmoyd(a)nvidia.com>
Reviewed-by: Thomas Zimmermann <tzimmermann(a)suse.de>
Tested-by: Carol L Soto csoto(a)nvidia.com<mailto:csoto@nvidia.com>
Fixes: 594e9c04b586 ("drm/ast: Create the driver for ASPEED proprietory Display-Port")
Cc: KuoHsiang Chou <kuohsiang_chou(a)aspeedtech.com>
Cc: Thomas Zimmermann <tzimmermann(a)suse.de>
Cc: Dave Airlie <airlied(a)redhat.com>
Cc: Jocelyn Falempe <jfalempe(a)redhat.com>
Cc: dri-devel(a)lists.freedesktop.org
Cc: <stable(a)vger.kernel.org> # v5.19+
Signed-off-by: Thomas Zimmermann <tzimmermann(a)suse.de>
Link: https://lore.kernel.org/r/20250917194346.2905522-1-nirmoyd@nvidia.com
diff --git a/drivers/gpu/drm/ast/ast_dp.c b/drivers/gpu/drm/ast/ast_dp.c
index 19c04687b0fe..8e650a02c528 100644
--- a/drivers/gpu/drm/ast/ast_dp.c
+++ b/drivers/gpu/drm/ast/ast_dp.c
@@ -134,7 +134,7 @@ static int ast_astdp_read_edid_block(void *data, u8 *buf, unsigned int block, si
* 3. The Delays are often longer a lot when system resume from S3/S4.
*/
if (j)
- mdelay(j + 1);
+ msleep(j + 1);
/* Wait for EDID offset to show up in mirror register */
vgacrd7 = ast_get_index_reg(ast, AST_IO_VGACRI, 0xd7);