October 2025 - Linux-stable-mirror

[PATCH 6.16.y] gcc-plugins: Remove TODO_verify_il for GCC >= 16

by Brahmajit Das

From: Kees Cook <kees(a)kernel.org> [ Upstream commit a40282dd3c48 ] GCC now runs TODO_verify_il automatically[1], so it is no longer exposed to plugins. Only use the flag on GCC < 16. Link: https://gcc.gnu.org/git/?p=gcc.git;a=commit;h=9739ae9384dd7cd3bb1c7683d6b80… [1] Suggested-by: Christopher Fore <csfore(a)posteo.net> Link: https://lore.kernel.org/r/20250920234519.work.915-kees@kernel.org Signed-off-by: Kees Cook <kees(a)kernel.org> Signed-off-by: Brahmajit Das <listout(a)listout.xyz> --- scripts/gcc-plugins/gcc-common.h | 7 +++++++ 1 file changed, 7 insertions(+) diff --git a/scripts/gcc-plugins/gcc-common.h b/scripts/gcc-plugins/gcc-common.h index 6cb6d1051815..8f1b3500f8e2 100644 --- a/scripts/gcc-plugins/gcc-common.h +++ b/scripts/gcc-plugins/gcc-common.h @@ -173,10 +173,17 @@ static inline opt_pass *get_pass_for_id(int id) return g->get_passes()->get_pass_for_id(id); } +#if BUILDING_GCC_VERSION < 16000 #define TODO_verify_ssa TODO_verify_il #define TODO_verify_flow TODO_verify_il #define TODO_verify_stmts TODO_verify_il #define TODO_verify_rtl_sharing TODO_verify_il +#else +#define TODO_verify_ssa 0 +#define TODO_verify_flow 0 +#define TODO_verify_stmts 0 +#define TODO_verify_rtl_sharing 0 +#endif #define INSN_DELETED_P(insn) (insn)->deleted() -- 2.51.0

6 hours, 29 minutes

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FW:Estimate

by Scott

6 hours, 35 minutes

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Please backport commit a40282dd3c48 ("gcc-plugins: Remove TODO_verify_il for GCC >= 16")

by Kees Cook

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

7 hours, 8 minutes

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[PATCH linux-next 0/2] ksm: fix exec/fork inheritance

by xu.xin16＠zte.com.cn

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

7 hours, 19 minutes

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[PATCH v4 03/10] PCI: Allow per function PCI slots

by Farhan Ali

On s390 systems, which use a machine level hypervisor, PCI devices are always accessed through a form of PCI pass-through which fundamentally operates on a per PCI function granularity. This is also reflected in the s390 PCI hotplug driver which creates hotplug slots for individual PCI functions. Its reset_slot() function, which is a wrapper for zpci_hot_reset_device(), thus also resets individual functions. Currently, the kernel's PCI_SLOT() macro assigns the same pci_slot object to multifunction devices. This approach worked fine on s390 systems that only exposed virtual functions as individual PCI domains to the operating system. Since commit 44510d6fa0c0 ("s390/pci: Handling multifunctions") s390 supports exposing the topology of multifunction PCI devices by grouping them in a shared PCI domain. When attempting to reset a function through the hotplug driver, the shared slot assignment causes the wrong function to be reset instead of the intended one. It also leaks memory as we do create a pci_slot object for the function, but don't correctly free it in pci_slot_release(). Add a flag for struct pci_slot to allow per function PCI slots for functions managed through a hypervisor, which exposes individual PCI functions while retaining the topology. Fixes: 44510d6fa0c0 ("s390/pci: Handling multifunctions") Cc: <stable(a)vger.kernel.org> Suggested-by: Niklas Schnelle <schnelle(a)linux.ibm.com> Signed-off-by: Farhan Ali <alifm(a)linux.ibm.com> --- drivers/pci/hotplug/s390_pci_hpc.c | 10 ++++++++-- drivers/pci/pci.c | 5 +++-- drivers/pci/slot.c | 14 +++++++++++--- include/linux/pci.h | 1 + 4 files changed, 23 insertions(+), 7 deletions(-) diff --git a/drivers/pci/hotplug/s390_pci_hpc.c b/drivers/pci/hotplug/s390_pci_hpc.c index d9996516f49e..8b547de464bf 100644 --- a/drivers/pci/hotplug/s390_pci_hpc.c +++ b/drivers/pci/hotplug/s390_pci_hpc.c @@ -126,14 +126,20 @@ static const struct hotplug_slot_ops s390_hotplug_slot_ops = { int zpci_init_slot(struct zpci_dev *zdev) { + int ret; char name[SLOT_NAME_SIZE]; struct zpci_bus *zbus = zdev->zbus; zdev->hotplug_slot.ops = &s390_hotplug_slot_ops; snprintf(name, SLOT_NAME_SIZE, "%08x", zdev->fid); - return pci_hp_register(&zdev->hotplug_slot, zbus->bus, - zdev->devfn, name); + ret = pci_hp_register(&zdev->hotplug_slot, zbus->bus, + zdev->devfn, name); + if (ret) + return ret; + + zdev->hotplug_slot.pci_slot->per_func_slot = 1; + return 0; } void zpci_exit_slot(struct zpci_dev *zdev) diff --git a/drivers/pci/pci.c b/drivers/pci/pci.c index 327fefc6a1eb..530a793a332c 100644 --- a/drivers/pci/pci.c +++ b/drivers/pci/pci.c @@ -5057,8 +5057,9 @@ static int pci_reset_hotplug_slot(struct hotplug_slot *hotplug, bool probe) static int pci_dev_reset_slot_function(struct pci_dev *dev, bool probe) { - if (dev->multifunction || dev->subordinate || !dev->slot || - dev->dev_flags & PCI_DEV_FLAGS_NO_BUS_RESET) + if (dev->subordinate || !dev->slot || + dev->dev_flags & PCI_DEV_FLAGS_NO_BUS_RESET || + (dev->multifunction && !dev->slot->per_func_slot)) return -ENOTTY; return pci_reset_hotplug_slot(dev->slot->hotplug, probe); diff --git a/drivers/pci/slot.c b/drivers/pci/slot.c index 50fb3eb595fe..51ee59e14393 100644 --- a/drivers/pci/slot.c +++ b/drivers/pci/slot.c @@ -63,6 +63,14 @@ static ssize_t cur_speed_read_file(struct pci_slot *slot, char *buf) return bus_speed_read(slot->bus->cur_bus_speed, buf); } +static bool pci_dev_matches_slot(struct pci_dev *dev, struct pci_slot *slot) +{ + if (slot->per_func_slot) + return dev->devfn == slot->number; + + return PCI_SLOT(dev->devfn) == slot->number; +} + static void pci_slot_release(struct kobject *kobj) { struct pci_dev *dev; @@ -73,7 +81,7 @@ static void pci_slot_release(struct kobject *kobj) down_read(&pci_bus_sem); list_for_each_entry(dev, &slot->bus->devices, bus_list) - if (PCI_SLOT(dev->devfn) == slot->number) + if (pci_dev_matches_slot(dev, slot)) dev->slot = NULL; up_read(&pci_bus_sem); @@ -166,7 +174,7 @@ void pci_dev_assign_slot(struct pci_dev *dev) mutex_lock(&pci_slot_mutex); list_for_each_entry(slot, &dev->bus->slots, list) - if (PCI_SLOT(dev->devfn) == slot->number) + if (pci_dev_matches_slot(dev, slot)) dev->slot = slot; mutex_unlock(&pci_slot_mutex); } @@ -285,7 +293,7 @@ struct pci_slot *pci_create_slot(struct pci_bus *parent, int slot_nr, down_read(&pci_bus_sem); list_for_each_entry(dev, &parent->devices, bus_list) - if (PCI_SLOT(dev->devfn) == slot_nr) + if (pci_dev_matches_slot(dev, slot)) dev->slot = slot; up_read(&pci_bus_sem); diff --git a/include/linux/pci.h b/include/linux/pci.h index 59876de13860..9265f32d9786 100644 --- a/include/linux/pci.h +++ b/include/linux/pci.h @@ -78,6 +78,7 @@ struct pci_slot { struct list_head list; /* Node in list of slots */ struct hotplug_slot *hotplug; /* Hotplug info (move here) */ unsigned char number; /* PCI_SLOT(pci_dev->devfn) */ + unsigned int per_func_slot:1; /* Allow per function slot */ struct kobject kobj; }; -- 2.43.0

7 hours, 45 minutes

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[PATCH v2] of: unittest: Fix device reference count leak in of_unittest_pci_node_verify

by Ma Ke

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

7 hours, 46 minutes

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[PATCH AUTOSEL 6.17-5.4] minixfs: Verify inode mode when loading from disk

by Sasha Levin

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

8 hours, 43 minutes

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[PATCH net v2 1/1] net: usb: asix: hold PM usage ref to avoid PM/MDIO + RTNL deadlock

by Oleksij Rempel

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

9 hours, 9 minutes

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[PATCH 5.10 000/122] 5.10.245-rc1 review

by Greg Kroah-Hartman

This is the start of the stable review cycle for the 5.10.245 release. There are 122 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/v5.x/stable-review/patch-5.10.245-r… or in the git tree and branch at: git://git.kernel.org/pub/scm/linux/kernel/git/stable/linux-stable-rc.git linux-5.10.y and the diffstat can be found below. thanks, greg k-h ------------- Pseudo-Shortlog of commits: Greg Kroah-Hartman <gregkh(a)linuxfoundation.org> Linux 5.10.245-rc1 Jinjiang Tu <tujinjiang(a)huawei.com> mm/hugetlb: fix folio is still mapped when deleted 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 idx validation in config queues msg 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 David Hildenbrand <david(a)redhat.com> mm/migrate_device: don't add folio to be freed to LRU in migrate_device_finalize() 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 Masami Hiramatsu (Google) <mhiramat(a)kernel.org> tracing: dynevent: Add a missing lockdown check on dynevent 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 input validation logic for action_meta Lukasz Czapnik <lukasz.czapnik(a)intel.com> i40e: fix idx validation in i40e_validate_queue_map Eric Biggers <ebiggers(a)kernel.org> crypto: af_alg - Fix incorrect boolean values in af_alg_ctx Zabelin Nikita <n.zabelin(a)mt-integration.ru> drm/gma500: Fix null dereference in hdmi teardown 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 Ido Schimmel <idosch(a)nvidia.com> nexthop: Emit a notification when a single nexthop is replaced Ido Schimmel <idosch(a)nvidia.com> nexthop: Emit a notification when a nexthop is added Ido Schimmel <idosch(a)nvidia.com> rtnetlink: Add RTNH_F_TRAP flag Ido Schimmel <idosch(a)nvidia.com> nexthop: Pass extack to nexthop notifier Alok Tiwari <alok.a.tiwari(a)oracle.com> bnxt_en: correct offset handling for IPv6 destination address 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 Geert Uytterhoeven <geert+renesas(a)glider.be> can: rcar_can: rcar_can_resume(): fix s2ram with PSCI Christian Loehle <christian.loehle(a)arm.com> cpufreq: Initialize cpufreq-based invariance before subsys Peng Fan <peng.fan(a)nxp.com> arm64: dts: imx8mp: Correct thermal sensor index Or Har-Toov <ohartoov(a)nvidia.com> IB/mlx5: Fix obj_type mismatch for SRQ event subscriptions 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 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 Matthieu Baerts (NGI0) <matttbe(a)kernel.org> mptcp: propagate shutdown to subflows when possible Qu Wenruo <wqu(a)suse.com> btrfs: tree-checker: fix the incorrect inode ref size check 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 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 Rafał Miłecki <rafal(a)milecki.pl> phy: phy-bcm-ns-usb3: drop support for deprecated DT binding Chunfeng Yun <chunfeng.yun(a)mediatek.com> phy: ti: convert to devm_platform_ioremap_resource(_byname) Chunfeng Yun <chunfeng.yun(a)mediatek.com> phy: broadcom: convert to devm_platform_ioremap_resource(_byname) 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 Alan Stern <stern(a)rowland.harvard.edu> USB: gadget: dummy-hcd: Fix locking bug in RT-enabled kernels Jakob Koschel <jakobkoschel(a)gmail.com> usb: gadget: dummy_hcd: remove usage of list iterator past the loop body Hugo Villeneuve <hvilleneuve(a)dimonoff.com> serial: sc16is7xx: fix bug in flow control levels init Herbert Xu <herbert(a)gondor.apana.org.au> crypto: af_alg - Disallow concurrent writes in af_alg_sendmsg Qi Xi <xiqi2(a)huawei.com> drm: bridge: cdns-mhdp8546: Fix missing mutex unlock on error path 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 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 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/* 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" Kuniyuki Iwashima <kuniyu(a)google.com> tcp: Clear tcp_sk(sk)->fastopen_rsk in tcp_disconnect(). 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 Jamie Bainbridge <jamie.bainbridge(a)gmail.com> qed: Don't collect too many protection override GRC elements Miaoqian Lin <linmq006(a)gmail.com> um: virtio_uml: Fix use-after-free after put_device in probe 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 Takashi Sakamoto <o-takashi(a)sakamocchi.jp> ALSA: firewire-motu: drop EPOLLOUT from poll return values as write is not supported Miaohe Lin <linmiaohe(a)huawei.com> mm/memory-failure: fix VM_BUG_ON_PAGE(PagePoisoned(page)) when unpoison memory Jani Nikula <jani.nikula(a)intel.com> drm/i915/power: fix size for for_each_set_bit() in abox iteration Bjorn Andersson <bjorn.andersson(a)oss.qualcomm.com> soc: qcom: mdt_loader: Deal with zero e_shentsize Johan Hovold <johan(a)kernel.org> phy: ti-pipe3: fix device leak at unbind Stephan Gerhold <stephan.gerhold(a)linaro.org> dmaengine: qcom: bam_dma: Fix DT error handling for num-channels/ees Anders Roxell <anders.roxell(a)linaro.org> dmaengine: ti: edma: Fix memory allocation size for queue_priority_map Tetsuo Handa <penguin-kernel(a)I-love.SAKURA.ne.jp> can: j1939: j1939_local_ecu_get(): undo increment when j1939_local_ecu_get() fails Tetsuo Handa <penguin-kernel(a)I-love.SAKURA.ne.jp> can: j1939: j1939_sk_bind(): call j1939_priv_put() immediately when j1939_local_ecu_get() failed Michal Schmidt <mschmidt(a)redhat.com> i40e: fix IRQ freeing in i40e_vsi_request_irq_msix error path Nitesh Narayan Lal <nitesh(a)redhat.com> i40e: Use irq_update_affinity_hint() Thomas Gleixner <tglx(a)linutronix.de> genirq: Provide new interfaces for affinity hints Thomas Gleixner <tglx(a)linutronix.de> genirq: Export affinity setter for modules John Garry <john.garry(a)huawei.com> genirq/affinity: Add irq_update_affinity_desc() Kohei Enju <enjuk(a)amazon.com> igb: fix link test skipping when interface is admin down Antoine Tenart <atenart(a)kernel.org> tunnels: reset the GSO metadata before reusing the skb Stefan Wahren <wahrenst(a)gmx.net> net: fec: Fix possible NPD in fec_enet_phy_reset_after_clk_enable() Fabio Porcedda <fabio.porcedda(a)gmail.com> USB: serial: option: add Telit Cinterion LE910C4-WWX new compositions Fabio Porcedda <fabio.porcedda(a)gmail.com> USB: serial: option: add Telit Cinterion FN990A w/audio compositions Fabian Vogt <fvogt(a)suse.de> tty: hvc_console: Call hvc_kick in hvc_write unconditionally Christoffer Sandberg <cs(a)tuxedo.de> Input: i8042 - add TUXEDO InfinityBook Pro Gen10 AMD to i8042 quirk table Alexander Sverdlin <alexander.sverdlin(a)siemens.com> mtd: nand: raw: atmel: Respect tAR, tCLR in read setup timing Alexander Dahl <ada(a)thorsis.com> mtd: nand: raw: atmel: Fix comment in timings preparation Christophe Kerello <christophe.kerello(a)foss.st.com> mtd: rawnand: stm32_fmc2: avoid overlapping mappings on ECC buffer Jack Wang <jinpu.wang(a)ionos.com> mtd: rawnand: stm32_fmc2: Fix dma_map_sg error check Wei Yang <richard.weiyang(a)gmail.com> mm/khugepaged: fix the address passed to notifier on testing young Miklos Szeredi <mszeredi(a)redhat.com> fuse: prevent overflow in copy_file_range return value Miklos Szeredi <mszeredi(a)redhat.com> fuse: check if copy_file_range() returns larger than requested size Christophe Kerello <christophe.kerello(a)foss.st.com> mtd: rawnand: stm32_fmc2: fix ECC overwrite Mark Tinguely <mark.tinguely(a)oracle.com> ocfs2: fix recursive semaphore deadlock in fiemap call Nathan Chancellor <nathan(a)kernel.org> compiler-clang.h: define __SANITIZE_*__ macros only when undefined Salah Triki <salah.triki(a)gmail.com> EDAC/altera: Delete an inappropriate dma_free_coherent() call Kees Cook <keescook(a)chromium.org> overflow: Allow mixed type arguments Nick Desaulniers <ndesaulniers(a)google.com> compiler.h: drop fallback overflow checkers Keith Busch <kbusch(a)kernel.org> overflow: Correct check_shl_overflow() comment Kuniyuki Iwashima <kuniyu(a)google.com> tcp_bpf: Call sk_msg_free() when tcp_bpf_send_verdict() fails to allocate psock->cork. Jonathan Curley <jcurley(a)purestorage.com> NFSv4/flexfiles: Fix layout merge mirror check. Luo Gengkun <luogengkun(a)huaweicloud.com> tracing: Fix tracing_marker may trigger page fault during preempt_disable Trond Myklebust <trond.myklebust(a)hammerspace.com> NFSv4: Clear the NFS_CAP_XATTR flag if not supported by the server Trond Myklebust <trond.myklebust(a)hammerspace.com> NFSv4: Don't clear capabilities that won't be reset Tigran Mkrtchyan <tigran.mkrtchyan(a)desy.de> flexfiles/pNFS: fix NULL checks on result of ff_layout_choose_ds_for_read Jiasheng Jiang <jiashengjiangcool(a)gmail.com> mtd: Add check for devm_kcalloc() Kuniyuki Iwashima <kuniyu(a)amazon.com> net: Fix null-ptr-deref by sock_lock_init_class_and_name() and rmmod. André Apitzsch <git(a)apitzsch.eu> media: i2c: imx214: Fix link frequency validation Arnd Bergmann <arnd(a)arndb.de> media: mtk-vcodec: venc: avoid -Wenum-compare-conditional warning Matthieu Baerts (NGI0) <matttbe(a)kernel.org> mptcp: pm: kernel: flush: do not reset ADD_ADDR limit ------------- Diffstat: Makefile | 4 +- arch/arm64/boot/dts/freescale/imx8mp.dtsi | 4 +- arch/um/drivers/virtio_uml.c | 6 +- arch/x86/kvm/svm/svm.c | 3 +- crypto/af_alg.c | 7 + drivers/cpufreq/cpufreq.c | 20 +- drivers/dma/qcom/bam_dma.c | 8 +- drivers/dma/ti/edma.c | 4 +- drivers/edac/altera_edac.c | 1 - .../gpu/drm/bridge/cadence/cdns-mhdp8546-core.c | 6 +- drivers/gpu/drm/gma500/oaktrail_hdmi.c | 2 +- drivers/gpu/drm/i915/display/intel_display_power.c | 6 +- drivers/infiniband/hw/mlx5/devx.c | 1 + drivers/input/serio/i8042-acpipnpio.h | 14 + drivers/media/i2c/imx214.c | 27 +- .../media/platform/mtk-vcodec/venc/venc_h264_if.c | 6 +- drivers/mmc/host/mvsdio.c | 2 +- drivers/mtd/mtdpstore.c | 3 + drivers/mtd/nand/raw/atmel/nand-controller.c | 18 +- drivers/mtd/nand/raw/stm32_fmc2_nand.c | 48 ++-- 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/mcba_usb.c | 1 + drivers/net/can/usb/peak_usb/pcan_usb_core.c | 2 +- drivers/net/ethernet/broadcom/bnxt/bnxt_tc.c | 2 +- drivers/net/ethernet/broadcom/cnic.c | 3 +- .../net/ethernet/cavium/liquidio/request_manager.c | 2 +- drivers/net/ethernet/freescale/fec_main.c | 3 +- drivers/net/ethernet/intel/i40e/i40e.h | 1 + drivers/net/ethernet/intel/i40e/i40e_ethtool.c | 25 +- drivers/net/ethernet/intel/i40e/i40e_main.c | 10 +- drivers/net/ethernet/intel/i40e/i40e_txrx.c | 3 - drivers/net/ethernet/intel/i40e/i40e_virtchnl_pf.c | 45 +++- drivers/net/ethernet/intel/i40e/i40e_virtchnl_pf.h | 3 +- drivers/net/ethernet/intel/igb/igb_ethtool.c | 5 +- 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-cygnus-pcie.c | 4 +- drivers/phy/broadcom/phy-bcm-kona-usb2.c | 4 +- drivers/phy/broadcom/phy-bcm-ns-usb2.c | 4 +- drivers/phy/broadcom/phy-bcm-ns-usb3.c | 168 +----------- drivers/phy/broadcom/phy-bcm-ns2-usbdrd.c | 13 +- drivers/phy/broadcom/phy-bcm-sr-pcie.c | 5 +- drivers/phy/broadcom/phy-bcm-sr-usb.c | 4 +- drivers/phy/broadcom/phy-brcm-sata.c | 8 +- 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 | 26 +- drivers/phy/ti/phy-omap-usb2.c | 28 +- drivers/phy/ti/phy-ti-pipe3.c | 42 +-- drivers/power/supply/bq27xxx_battery.c | 4 +- drivers/soc/qcom/mdt_loader.c | 12 +- drivers/tty/hvc/hvc_console.c | 6 +- drivers/tty/serial/sc16is7xx.c | 14 +- drivers/usb/core/quirks.c | 2 +- drivers/usb/gadget/udc/dummy_hcd.c | 25 +- drivers/usb/host/xhci-dbgcap.c | 94 +++++-- drivers/usb/serial/option.c | 17 ++ drivers/video/fbdev/core/fbcon.c | 13 +- fs/btrfs/tree-checker.c | 4 +- fs/fuse/file.c | 5 +- fs/hugetlbfs/inode.c | 14 +- fs/nfs/client.c | 2 + fs/nfs/flexfilelayout/flexfilelayout.c | 21 +- fs/nfs/nfs4proc.c | 1 - fs/nilfs2/sysfs.c | 4 +- fs/nilfs2/sysfs.h | 8 +- fs/ocfs2/extent_map.c | 10 +- include/crypto/if_alg.h | 10 +- include/linux/compiler-clang.h | 44 ++-- include/linux/compiler-gcc.h | 4 - include/linux/interrupt.h | 96 ++++--- include/linux/overflow.h | 208 ++++----------- include/net/nexthop.h | 3 +- include/net/sock.h | 40 ++- include/uapi/linux/rtnetlink.h | 6 +- kernel/cgroup/cgroup.c | 43 +++- kernel/irq/manage.c | 111 +++++++- kernel/trace/trace.c | 4 +- kernel/trace/trace_dynevent.c | 4 + mm/khugepaged.c | 2 +- mm/memory-failure.c | 7 +- mm/migrate.c | 12 +- net/can/j1939/bus.c | 5 +- net/can/j1939/socket.c | 3 + net/core/sock.c | 5 + net/ipv4/fib_semantics.c | 2 + net/ipv4/ip_tunnel_core.c | 6 + net/ipv4/nexthop.c | 28 +- net/ipv4/tcp.c | 5 + net/ipv4/tcp_bpf.c | 5 +- net/mac80211/driver-ops.h | 2 +- net/mptcp/pm_netlink.c | 1 - net/mptcp/protocol.c | 16 ++ net/rds/ib_frmr.c | 20 +- net/rfkill/rfkill-gpio.c | 22 +- sound/firewire/motu/motu-hwdep.c | 2 +- sound/soc/codecs/wm8940.c | 2 +- sound/soc/codecs/wm8974.c | 8 +- sound/soc/sof/intel/hda-stream.c | 2 +- sound/usb/mixer_quirks.c | 285 ++++++++++++++++++++- tools/include/linux/compiler-gcc.h | 4 - tools/include/linux/overflow.h | 140 +--------- tools/testing/selftests/net/fib_nexthops.sh | 12 +- 109 files changed, 1195 insertions(+), 909 deletions(-)

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[PATCH] fs/notify: call exportfs_encode_fid with s_umount

by Jakub Acs

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

10 hours, 4 minutes

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