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FAILED: patch "[PATCH] drm/mediatek: Fix probe device leaks" failed to apply to 6.6-stable tree

by gregkh＠linuxfoundation.org

5 days, 10 hours

FAILED: patch "[PATCH] drm/mediatek: Fix probe resource leaks" failed to apply to 5.10-stable tree

by gregkh＠linuxfoundation.org

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 07c7c640a8eb9e196f357d15d88a59602a947197 # <resolve conflicts, build, test, etc.> git commit -s git send-email --to '<stable(a)vger.kernel.org>' --in-reply-to '2026010555-strained-clatter-faf2@gregkh' --subject-prefix 'PATCH 5.10.y' HEAD^.. Possible dependencies: thanks, greg k-h ------------------ original commit in Linus's tree ------------------ From 07c7c640a8eb9e196f357d15d88a59602a947197 Mon Sep 17 00:00:00 2001 From: Johan Hovold <johan(a)kernel.org> Date: Tue, 23 Sep 2025 17:23:36 +0200 Subject: [PATCH] drm/mediatek: Fix probe resource leaks Make sure to unmap and release the component iomap and clock on probe failure (e.g. probe deferral) and on driver unbind. Note that unlike of_iomap(), devm_of_iomap() also checks whether the region is already mapped. Fixes: 119f5173628a ("drm/mediatek: Add DRM Driver for Mediatek SoC MT8173.") Cc: stable(a)vger.kernel.org # 4.7 Cc: CK Hu <ck.hu(a)mediatek.com> Signed-off-by: Johan Hovold <johan(a)kernel.org> Reviewed-by: AngeloGioacchino Del Regno <angelogioacchino.delregno(a)collabora.com> Link: https://patchwork.kernel.org/project/dri-devel/patch/20250923152340.18234-2… Signed-off-by: Chun-Kuang Hu <chunkuang.hu(a)kernel.org> diff --git a/drivers/gpu/drm/mediatek/mtk_ddp_comp.c b/drivers/gpu/drm/mediatek/mtk_ddp_comp.c index ac6620e10262..0264017806ad 100644 --- a/drivers/gpu/drm/mediatek/mtk_ddp_comp.c +++ b/drivers/gpu/drm/mediatek/mtk_ddp_comp.c @@ -621,15 +621,20 @@ int mtk_find_possible_crtcs(struct drm_device *drm, struct device *dev) return ret; } -int mtk_ddp_comp_init(struct device_node *node, struct mtk_ddp_comp *comp, +static void mtk_ddp_comp_clk_put(void *_clk) +{ + struct clk *clk = _clk; + + clk_put(clk); +} + +int mtk_ddp_comp_init(struct device *dev, struct device_node *node, struct mtk_ddp_comp *comp, unsigned int comp_id) { struct platform_device *comp_pdev; enum mtk_ddp_comp_type type; struct mtk_ddp_comp_dev *priv; -#if IS_REACHABLE(CONFIG_MTK_CMDQ) int ret; -#endif if (comp_id >= DDP_COMPONENT_DRM_ID_MAX) return -EINVAL; @@ -670,11 +675,18 @@ int mtk_ddp_comp_init(struct device_node *node, struct mtk_ddp_comp *comp, if (!priv) return -ENOMEM; - priv->regs = of_iomap(node, 0); + priv->regs = devm_of_iomap(dev, node, 0, NULL); + if (IS_ERR(priv->regs)) + return PTR_ERR(priv->regs); + priv->clk = of_clk_get(node, 0); if (IS_ERR(priv->clk)) return PTR_ERR(priv->clk); + ret = devm_add_action_or_reset(dev, mtk_ddp_comp_clk_put, priv->clk); + if (ret) + return ret; + #if IS_REACHABLE(CONFIG_MTK_CMDQ) ret = cmdq_dev_get_client_reg(comp->dev, &priv->cmdq_reg, 0); if (ret) diff --git a/drivers/gpu/drm/mediatek/mtk_ddp_comp.h b/drivers/gpu/drm/mediatek/mtk_ddp_comp.h index 7289b3dcf22f..3f3d43f4330d 100644 --- a/drivers/gpu/drm/mediatek/mtk_ddp_comp.h +++ b/drivers/gpu/drm/mediatek/mtk_ddp_comp.h @@ -350,7 +350,7 @@ static inline void mtk_ddp_comp_encoder_index_set(struct mtk_ddp_comp *comp) int mtk_ddp_comp_get_id(struct device_node *node, enum mtk_ddp_comp_type comp_type); int mtk_find_possible_crtcs(struct drm_device *drm, struct device *dev); -int mtk_ddp_comp_init(struct device_node *comp_node, struct mtk_ddp_comp *comp, +int mtk_ddp_comp_init(struct device *dev, struct device_node *comp_node, struct mtk_ddp_comp *comp, unsigned int comp_id); enum mtk_ddp_comp_type mtk_ddp_comp_get_type(unsigned int comp_id); void mtk_ddp_write(struct cmdq_pkt *cmdq_pkt, unsigned int value, diff --git a/drivers/gpu/drm/mediatek/mtk_drm_drv.c b/drivers/gpu/drm/mediatek/mtk_drm_drv.c index eb5537f0ac90..384b0510272c 100644 --- a/drivers/gpu/drm/mediatek/mtk_drm_drv.c +++ b/drivers/gpu/drm/mediatek/mtk_drm_drv.c @@ -1133,7 +1133,7 @@ static int mtk_drm_probe(struct platform_device *pdev) (void *)private->mmsys_dev, sizeof(*private->mmsys_dev)); private->ddp_comp[DDP_COMPONENT_DRM_OVL_ADAPTOR].dev = &ovl_adaptor->dev; - mtk_ddp_comp_init(NULL, &private->ddp_comp[DDP_COMPONENT_DRM_OVL_ADAPTOR], + mtk_ddp_comp_init(dev, NULL, &private->ddp_comp[DDP_COMPONENT_DRM_OVL_ADAPTOR], DDP_COMPONENT_DRM_OVL_ADAPTOR); component_match_add(dev, &match, compare_dev, &ovl_adaptor->dev); } @@ -1199,7 +1199,7 @@ static int mtk_drm_probe(struct platform_device *pdev) node); } - ret = mtk_ddp_comp_init(node, &private->ddp_comp[comp_id], comp_id); + ret = mtk_ddp_comp_init(dev, node, &private->ddp_comp[comp_id], comp_id); if (ret) { of_node_put(node); goto err_node;

5 days, 11 hours

FAILED: patch "[PATCH] drm/mediatek: Fix probe resource leaks" failed to apply to 6.1-stable tree

by gregkh＠linuxfoundation.org

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 07c7c640a8eb9e196f357d15d88a59602a947197 # <resolve conflicts, build, test, etc.> git commit -s git send-email --to '<stable(a)vger.kernel.org>' --in-reply-to '2026010555-epic-jubilance-b0c4@gregkh' --subject-prefix 'PATCH 6.1.y' HEAD^.. Possible dependencies: thanks, greg k-h ------------------ original commit in Linus's tree ------------------ From 07c7c640a8eb9e196f357d15d88a59602a947197 Mon Sep 17 00:00:00 2001 From: Johan Hovold <johan(a)kernel.org> Date: Tue, 23 Sep 2025 17:23:36 +0200 Subject: [PATCH] drm/mediatek: Fix probe resource leaks Make sure to unmap and release the component iomap and clock on probe failure (e.g. probe deferral) and on driver unbind. Note that unlike of_iomap(), devm_of_iomap() also checks whether the region is already mapped. Fixes: 119f5173628a ("drm/mediatek: Add DRM Driver for Mediatek SoC MT8173.") Cc: stable(a)vger.kernel.org # 4.7 Cc: CK Hu <ck.hu(a)mediatek.com> Signed-off-by: Johan Hovold <johan(a)kernel.org> Reviewed-by: AngeloGioacchino Del Regno <angelogioacchino.delregno(a)collabora.com> Link: https://patchwork.kernel.org/project/dri-devel/patch/20250923152340.18234-2… Signed-off-by: Chun-Kuang Hu <chunkuang.hu(a)kernel.org> diff --git a/drivers/gpu/drm/mediatek/mtk_ddp_comp.c b/drivers/gpu/drm/mediatek/mtk_ddp_comp.c index ac6620e10262..0264017806ad 100644 --- a/drivers/gpu/drm/mediatek/mtk_ddp_comp.c +++ b/drivers/gpu/drm/mediatek/mtk_ddp_comp.c @@ -621,15 +621,20 @@ int mtk_find_possible_crtcs(struct drm_device *drm, struct device *dev) return ret; } -int mtk_ddp_comp_init(struct device_node *node, struct mtk_ddp_comp *comp, +static void mtk_ddp_comp_clk_put(void *_clk) +{ + struct clk *clk = _clk; + + clk_put(clk); +} + +int mtk_ddp_comp_init(struct device *dev, struct device_node *node, struct mtk_ddp_comp *comp, unsigned int comp_id) { struct platform_device *comp_pdev; enum mtk_ddp_comp_type type; struct mtk_ddp_comp_dev *priv; -#if IS_REACHABLE(CONFIG_MTK_CMDQ) int ret; -#endif if (comp_id >= DDP_COMPONENT_DRM_ID_MAX) return -EINVAL; @@ -670,11 +675,18 @@ int mtk_ddp_comp_init(struct device_node *node, struct mtk_ddp_comp *comp, if (!priv) return -ENOMEM; - priv->regs = of_iomap(node, 0); + priv->regs = devm_of_iomap(dev, node, 0, NULL); + if (IS_ERR(priv->regs)) + return PTR_ERR(priv->regs); + priv->clk = of_clk_get(node, 0); if (IS_ERR(priv->clk)) return PTR_ERR(priv->clk); + ret = devm_add_action_or_reset(dev, mtk_ddp_comp_clk_put, priv->clk); + if (ret) + return ret; + #if IS_REACHABLE(CONFIG_MTK_CMDQ) ret = cmdq_dev_get_client_reg(comp->dev, &priv->cmdq_reg, 0); if (ret) diff --git a/drivers/gpu/drm/mediatek/mtk_ddp_comp.h b/drivers/gpu/drm/mediatek/mtk_ddp_comp.h index 7289b3dcf22f..3f3d43f4330d 100644 --- a/drivers/gpu/drm/mediatek/mtk_ddp_comp.h +++ b/drivers/gpu/drm/mediatek/mtk_ddp_comp.h @@ -350,7 +350,7 @@ static inline void mtk_ddp_comp_encoder_index_set(struct mtk_ddp_comp *comp) int mtk_ddp_comp_get_id(struct device_node *node, enum mtk_ddp_comp_type comp_type); int mtk_find_possible_crtcs(struct drm_device *drm, struct device *dev); -int mtk_ddp_comp_init(struct device_node *comp_node, struct mtk_ddp_comp *comp, +int mtk_ddp_comp_init(struct device *dev, struct device_node *comp_node, struct mtk_ddp_comp *comp, unsigned int comp_id); enum mtk_ddp_comp_type mtk_ddp_comp_get_type(unsigned int comp_id); void mtk_ddp_write(struct cmdq_pkt *cmdq_pkt, unsigned int value, diff --git a/drivers/gpu/drm/mediatek/mtk_drm_drv.c b/drivers/gpu/drm/mediatek/mtk_drm_drv.c index eb5537f0ac90..384b0510272c 100644 --- a/drivers/gpu/drm/mediatek/mtk_drm_drv.c +++ b/drivers/gpu/drm/mediatek/mtk_drm_drv.c @@ -1133,7 +1133,7 @@ static int mtk_drm_probe(struct platform_device *pdev) (void *)private->mmsys_dev, sizeof(*private->mmsys_dev)); private->ddp_comp[DDP_COMPONENT_DRM_OVL_ADAPTOR].dev = &ovl_adaptor->dev; - mtk_ddp_comp_init(NULL, &private->ddp_comp[DDP_COMPONENT_DRM_OVL_ADAPTOR], + mtk_ddp_comp_init(dev, NULL, &private->ddp_comp[DDP_COMPONENT_DRM_OVL_ADAPTOR], DDP_COMPONENT_DRM_OVL_ADAPTOR); component_match_add(dev, &match, compare_dev, &ovl_adaptor->dev); } @@ -1199,7 +1199,7 @@ static int mtk_drm_probe(struct platform_device *pdev) node); } - ret = mtk_ddp_comp_init(node, &private->ddp_comp[comp_id], comp_id); + ret = mtk_ddp_comp_init(dev, node, &private->ddp_comp[comp_id], comp_id); if (ret) { of_node_put(node); goto err_node;

5 days, 11 hours

FAILED: patch "[PATCH] drm/mediatek: Fix probe resource leaks" failed to apply to 5.15-stable tree

by gregkh＠linuxfoundation.org

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 07c7c640a8eb9e196f357d15d88a59602a947197 # <resolve conflicts, build, test, etc.> git commit -s git send-email --to '<stable(a)vger.kernel.org>' --in-reply-to '2026010555-boots-sultry-726e@gregkh' --subject-prefix 'PATCH 5.15.y' HEAD^.. Possible dependencies: thanks, greg k-h ------------------ original commit in Linus's tree ------------------ From 07c7c640a8eb9e196f357d15d88a59602a947197 Mon Sep 17 00:00:00 2001 From: Johan Hovold <johan(a)kernel.org> Date: Tue, 23 Sep 2025 17:23:36 +0200 Subject: [PATCH] drm/mediatek: Fix probe resource leaks Make sure to unmap and release the component iomap and clock on probe failure (e.g. probe deferral) and on driver unbind. Note that unlike of_iomap(), devm_of_iomap() also checks whether the region is already mapped. Fixes: 119f5173628a ("drm/mediatek: Add DRM Driver for Mediatek SoC MT8173.") Cc: stable(a)vger.kernel.org # 4.7 Cc: CK Hu <ck.hu(a)mediatek.com> Signed-off-by: Johan Hovold <johan(a)kernel.org> Reviewed-by: AngeloGioacchino Del Regno <angelogioacchino.delregno(a)collabora.com> Link: https://patchwork.kernel.org/project/dri-devel/patch/20250923152340.18234-2… Signed-off-by: Chun-Kuang Hu <chunkuang.hu(a)kernel.org> diff --git a/drivers/gpu/drm/mediatek/mtk_ddp_comp.c b/drivers/gpu/drm/mediatek/mtk_ddp_comp.c index ac6620e10262..0264017806ad 100644 --- a/drivers/gpu/drm/mediatek/mtk_ddp_comp.c +++ b/drivers/gpu/drm/mediatek/mtk_ddp_comp.c @@ -621,15 +621,20 @@ int mtk_find_possible_crtcs(struct drm_device *drm, struct device *dev) return ret; } -int mtk_ddp_comp_init(struct device_node *node, struct mtk_ddp_comp *comp, +static void mtk_ddp_comp_clk_put(void *_clk) +{ + struct clk *clk = _clk; + + clk_put(clk); +} + +int mtk_ddp_comp_init(struct device *dev, struct device_node *node, struct mtk_ddp_comp *comp, unsigned int comp_id) { struct platform_device *comp_pdev; enum mtk_ddp_comp_type type; struct mtk_ddp_comp_dev *priv; -#if IS_REACHABLE(CONFIG_MTK_CMDQ) int ret; -#endif if (comp_id >= DDP_COMPONENT_DRM_ID_MAX) return -EINVAL; @@ -670,11 +675,18 @@ int mtk_ddp_comp_init(struct device_node *node, struct mtk_ddp_comp *comp, if (!priv) return -ENOMEM; - priv->regs = of_iomap(node, 0); + priv->regs = devm_of_iomap(dev, node, 0, NULL); + if (IS_ERR(priv->regs)) + return PTR_ERR(priv->regs); + priv->clk = of_clk_get(node, 0); if (IS_ERR(priv->clk)) return PTR_ERR(priv->clk); + ret = devm_add_action_or_reset(dev, mtk_ddp_comp_clk_put, priv->clk); + if (ret) + return ret; + #if IS_REACHABLE(CONFIG_MTK_CMDQ) ret = cmdq_dev_get_client_reg(comp->dev, &priv->cmdq_reg, 0); if (ret) diff --git a/drivers/gpu/drm/mediatek/mtk_ddp_comp.h b/drivers/gpu/drm/mediatek/mtk_ddp_comp.h index 7289b3dcf22f..3f3d43f4330d 100644 --- a/drivers/gpu/drm/mediatek/mtk_ddp_comp.h +++ b/drivers/gpu/drm/mediatek/mtk_ddp_comp.h @@ -350,7 +350,7 @@ static inline void mtk_ddp_comp_encoder_index_set(struct mtk_ddp_comp *comp) int mtk_ddp_comp_get_id(struct device_node *node, enum mtk_ddp_comp_type comp_type); int mtk_find_possible_crtcs(struct drm_device *drm, struct device *dev); -int mtk_ddp_comp_init(struct device_node *comp_node, struct mtk_ddp_comp *comp, +int mtk_ddp_comp_init(struct device *dev, struct device_node *comp_node, struct mtk_ddp_comp *comp, unsigned int comp_id); enum mtk_ddp_comp_type mtk_ddp_comp_get_type(unsigned int comp_id); void mtk_ddp_write(struct cmdq_pkt *cmdq_pkt, unsigned int value, diff --git a/drivers/gpu/drm/mediatek/mtk_drm_drv.c b/drivers/gpu/drm/mediatek/mtk_drm_drv.c index eb5537f0ac90..384b0510272c 100644 --- a/drivers/gpu/drm/mediatek/mtk_drm_drv.c +++ b/drivers/gpu/drm/mediatek/mtk_drm_drv.c @@ -1133,7 +1133,7 @@ static int mtk_drm_probe(struct platform_device *pdev) (void *)private->mmsys_dev, sizeof(*private->mmsys_dev)); private->ddp_comp[DDP_COMPONENT_DRM_OVL_ADAPTOR].dev = &ovl_adaptor->dev; - mtk_ddp_comp_init(NULL, &private->ddp_comp[DDP_COMPONENT_DRM_OVL_ADAPTOR], + mtk_ddp_comp_init(dev, NULL, &private->ddp_comp[DDP_COMPONENT_DRM_OVL_ADAPTOR], DDP_COMPONENT_DRM_OVL_ADAPTOR); component_match_add(dev, &match, compare_dev, &ovl_adaptor->dev); } @@ -1199,7 +1199,7 @@ static int mtk_drm_probe(struct platform_device *pdev) node); } - ret = mtk_ddp_comp_init(node, &private->ddp_comp[comp_id], comp_id); + ret = mtk_ddp_comp_init(dev, node, &private->ddp_comp[comp_id], comp_id); if (ret) { of_node_put(node); goto err_node;

5 days, 11 hours

[PATCH] cacheinfo: Remove of_node_put() for fw_token

by Petr Malat

fw_token is used for DT/ACPI systems to identify CPUs sharing caches. For DT based systems, fw_token is set to a pointer to a DT node. Commit 22def0b492e6 ("arch_topology: Build cacheinfo from primary CPU") removed clearing of per_cpu_cacheinfo(cpu), which leads to reference underrun in cache_shared_cpu_map_remove() during repeated cpu offline/online as the reference is no longer incremented, because allocate_cache_info() is now skipped in the online path. The same problem existed on upstream but had a different root cause, see 2613cc29c572 ("cacheinfo: Remove of_node_put() for fw_token"). Fixes the following splat: OF: ERROR: Bad of_node_put() on /cpus/l2-cache0 CPU: 3 PID: 29 Comm: cpuhp/3 Tainted: G O 6.1.159-arm64 #1 Hardware name: AXM56xx Victoria (DT) Call trace: dump_backtrace+0xd8/0x12c show_stack+0x1c/0x34 dump_stack_lvl+0x70/0x88 dump_stack+0x14/0x2c of_node_release+0x134/0x138 kobject_put+0xa8/0x21c of_node_put+0x1c/0x28 cache_shared_cpu_map_remove+0x19c/0x220 cacheinfo_cpu_pre_down+0x60/0xa0 cpuhp_invoke_callback+0x140/0x570 cpuhp_thread_fun+0xc8/0x19c smpboot_thread_fn+0x218/0x23c kthread+0x108/0x118 ret_from_fork+0x10/0x20 Fixes: 22def0b492e6 ("arch_topology: Build cacheinfo from primary CPU") Signed-off-by: Petr Malat <oss(a)malat.biz> --- drivers/base/cacheinfo.c | 2 -- 1 file changed, 2 deletions(-) diff --git a/drivers/base/cacheinfo.c b/drivers/base/cacheinfo.c index 9e11d42b0d64..b57f64725f25 100644 --- a/drivers/base/cacheinfo.c +++ b/drivers/base/cacheinfo.c @@ -404,8 +404,6 @@ static void cache_shared_cpu_map_remove(unsigned int cpu) } } } - if (of_have_populated_dt()) - of_node_put(this_leaf->fw_token); } /* cpu is no longer populated in the shared map */ -- 2.39.5

5 days, 11 hours

[PATCH] libceph: Reset sparse-read on fault

by Sam Edwards

When a fault occurs, the connection is abandoned, reestablished, and any pending operations are retried. The OSD client tracks the progress of a sparse-read reply using a separate state machine, largely independent of the messenger's state. If a connection is lost mid-payload or the sparse-read state machine returns an error, the sparse-read state is not reset. The OSD client will then interpret the beginning of a new reply as the continuation of the old one. If this makes the sparse-read machinery enter a failure state, it may never recover, producing loops like: libceph: [0] got 0 extents libceph: data len 142248331 != extent len 0 libceph: osd0 (1)...:6801 socket error on read libceph: data len 142248331 != extent len 0 libceph: osd0 (1)...:6801 socket error on read Therefore, reset the sparse-read state in osd_fault(), ensuring retries start from a clean state. Cc: stable(a)vger.kernel.org Signed-off-by: Sam Edwards <CFSworks(a)gmail.com> --- net/ceph/osd_client.c | 3 +++ 1 file changed, 3 insertions(+) diff --git a/net/ceph/osd_client.c b/net/ceph/osd_client.c index 3667319b949d..1a7be2f615dc 100644 --- a/net/ceph/osd_client.c +++ b/net/ceph/osd_client.c @@ -4281,6 +4281,9 @@ static void osd_fault(struct ceph_connection *con) goto out_unlock; } + osd->o_sparse_op_idx = -1; + ceph_init_sparse_read(&osd->o_sparse_read); + if (!reopen_osd(osd)) kick_osd_requests(osd); maybe_request_map(osdc); -- 2.51.2

5 days, 11 hours

FAILED: patch "[PATCH] kasan: unpoison vms[area] addresses with a common tag" failed to apply to 6.6-stable tree

by gregkh＠linuxfoundation.org

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 6a0e5b333842cf65d6f4e4f0a2a4386504802515 # <resolve conflicts, build, test, etc.> git commit -s git send-email --to '<stable(a)vger.kernel.org>' --in-reply-to '2026010530-majesty-gangway-5658@gregkh' --subject-prefix 'PATCH 6.6.y' HEAD^.. Possible dependencies: thanks, greg k-h ------------------ original commit in Linus's tree ------------------ From 6a0e5b333842cf65d6f4e4f0a2a4386504802515 Mon Sep 17 00:00:00 2001 From: Maciej Wieczor-Retman <maciej.wieczor-retman(a)intel.com> Date: Thu, 4 Dec 2025 19:00:11 +0000 Subject: [PATCH] kasan: unpoison vms[area] addresses with a common tag A KASAN tag mismatch, possibly causing a kernel panic, can be observed on systems with a tag-based KASAN enabled and with multiple NUMA nodes. It was reported on arm64 and reproduced on x86. It can be explained in the following points: 1. There can be more than one virtual memory chunk. 2. Chunk's base address has a tag. 3. The base address points at the first chunk and thus inherits the tag of the first chunk. 4. The subsequent chunks will be accessed with the tag from the first chunk. 5. Thus, the subsequent chunks need to have their tag set to match that of the first chunk. Use the new vmalloc flag that disables random tag assignment in __kasan_unpoison_vmalloc() - pass the same random tag to all the vm_structs by tagging the pointers before they go inside __kasan_unpoison_vmalloc(). Assigning a common tag resolves the pcpu chunk address mismatch. [akpm(a)linux-foundation.org: use WARN_ON_ONCE(), per Andrey] Link: https://lkml.kernel.org/r/CA+fCnZeuGdKSEm11oGT6FS71_vGq1vjq-xY36kxVdFvwmag2… [maciej.wieczor-retman(a)intel.com: remove unneeded pr_warn()] Link: https://lkml.kernel.org/r/919897daaaa3c982a27762a2ee038769ad033991.17649453… Link: https://lkml.kernel.org/r/873821114a9f722ffb5d6702b94782e902883fdf.17648745… Fixes: 1d96320f8d53 ("kasan, vmalloc: add vmalloc tagging for SW_TAGS") Signed-off-by: Maciej Wieczor-Retman <maciej.wieczor-retman(a)intel.com> Reviewed-by: Andrey Konovalov <andreyknvl(a)gmail.com> Cc: Alexander Potapenko <glider(a)google.com> Cc: Andrey Ryabinin <ryabinin.a.a(a)gmail.com> Cc: Danilo Krummrich <dakr(a)kernel.org> Cc: Dmitriy Vyukov <dvyukov(a)google.com> Cc: Jiayuan Chen <jiayuan.chen(a)linux.dev> Cc: Kees Cook <kees(a)kernel.org> Cc: Marco Elver <elver(a)google.com> Cc: "Uladzislau Rezki (Sony)" <urezki(a)gmail.com> Cc: Vincenzo Frascino <vincenzo.frascino(a)arm.com> Cc: <stable(a)vger.kernel.org> [6.1+] Signed-off-by: Andrew Morton <akpm(a)linux-foundation.org> diff --git a/mm/kasan/common.c b/mm/kasan/common.c index b2b40c59ce18..ed489a14dddf 100644 --- a/mm/kasan/common.c +++ b/mm/kasan/common.c @@ -584,11 +584,26 @@ void __kasan_unpoison_vmap_areas(struct vm_struct **vms, int nr_vms, unsigned long size; void *addr; int area; + u8 tag; - for (area = 0 ; area < nr_vms ; area++) { + /* + * If KASAN_VMALLOC_KEEP_TAG was set at this point, all vms[] pointers + * would be unpoisoned with the KASAN_TAG_KERNEL which would disable + * KASAN checks down the line. + */ + if (WARN_ON_ONCE(flags & KASAN_VMALLOC_KEEP_TAG)) + return; + + size = vms[0]->size; + addr = vms[0]->addr; + vms[0]->addr = __kasan_unpoison_vmalloc(addr, size, flags); + tag = get_tag(vms[0]->addr); + + for (area = 1 ; area < nr_vms ; area++) { size = vms[area]->size; - addr = vms[area]->addr; - vms[area]->addr = __kasan_unpoison_vmalloc(addr, size, flags); + addr = set_tag(vms[area]->addr, tag); + vms[area]->addr = + __kasan_unpoison_vmalloc(addr, size, flags | KASAN_VMALLOC_KEEP_TAG); } } #endif

5 days, 11 hours

FAILED: patch "[PATCH] kasan: unpoison vms[area] addresses with a common tag" failed to apply to 6.1-stable tree

by gregkh＠linuxfoundation.org

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 6a0e5b333842cf65d6f4e4f0a2a4386504802515 # <resolve conflicts, build, test, etc.> git commit -s git send-email --to '<stable(a)vger.kernel.org>' --in-reply-to '2026010532-stained-crumpet-3d80@gregkh' --subject-prefix 'PATCH 6.1.y' HEAD^.. Possible dependencies: thanks, greg k-h ------------------ original commit in Linus's tree ------------------ From 6a0e5b333842cf65d6f4e4f0a2a4386504802515 Mon Sep 17 00:00:00 2001 From: Maciej Wieczor-Retman <maciej.wieczor-retman(a)intel.com> Date: Thu, 4 Dec 2025 19:00:11 +0000 Subject: [PATCH] kasan: unpoison vms[area] addresses with a common tag A KASAN tag mismatch, possibly causing a kernel panic, can be observed on systems with a tag-based KASAN enabled and with multiple NUMA nodes. It was reported on arm64 and reproduced on x86. It can be explained in the following points: 1. There can be more than one virtual memory chunk. 2. Chunk's base address has a tag. 3. The base address points at the first chunk and thus inherits the tag of the first chunk. 4. The subsequent chunks will be accessed with the tag from the first chunk. 5. Thus, the subsequent chunks need to have their tag set to match that of the first chunk. Use the new vmalloc flag that disables random tag assignment in __kasan_unpoison_vmalloc() - pass the same random tag to all the vm_structs by tagging the pointers before they go inside __kasan_unpoison_vmalloc(). Assigning a common tag resolves the pcpu chunk address mismatch. [akpm(a)linux-foundation.org: use WARN_ON_ONCE(), per Andrey] Link: https://lkml.kernel.org/r/CA+fCnZeuGdKSEm11oGT6FS71_vGq1vjq-xY36kxVdFvwmag2… [maciej.wieczor-retman(a)intel.com: remove unneeded pr_warn()] Link: https://lkml.kernel.org/r/919897daaaa3c982a27762a2ee038769ad033991.17649453… Link: https://lkml.kernel.org/r/873821114a9f722ffb5d6702b94782e902883fdf.17648745… Fixes: 1d96320f8d53 ("kasan, vmalloc: add vmalloc tagging for SW_TAGS") Signed-off-by: Maciej Wieczor-Retman <maciej.wieczor-retman(a)intel.com> Reviewed-by: Andrey Konovalov <andreyknvl(a)gmail.com> Cc: Alexander Potapenko <glider(a)google.com> Cc: Andrey Ryabinin <ryabinin.a.a(a)gmail.com> Cc: Danilo Krummrich <dakr(a)kernel.org> Cc: Dmitriy Vyukov <dvyukov(a)google.com> Cc: Jiayuan Chen <jiayuan.chen(a)linux.dev> Cc: Kees Cook <kees(a)kernel.org> Cc: Marco Elver <elver(a)google.com> Cc: "Uladzislau Rezki (Sony)" <urezki(a)gmail.com> Cc: Vincenzo Frascino <vincenzo.frascino(a)arm.com> Cc: <stable(a)vger.kernel.org> [6.1+] Signed-off-by: Andrew Morton <akpm(a)linux-foundation.org> diff --git a/mm/kasan/common.c b/mm/kasan/common.c index b2b40c59ce18..ed489a14dddf 100644 --- a/mm/kasan/common.c +++ b/mm/kasan/common.c @@ -584,11 +584,26 @@ void __kasan_unpoison_vmap_areas(struct vm_struct **vms, int nr_vms, unsigned long size; void *addr; int area; + u8 tag; - for (area = 0 ; area < nr_vms ; area++) { + /* + * If KASAN_VMALLOC_KEEP_TAG was set at this point, all vms[] pointers + * would be unpoisoned with the KASAN_TAG_KERNEL which would disable + * KASAN checks down the line. + */ + if (WARN_ON_ONCE(flags & KASAN_VMALLOC_KEEP_TAG)) + return; + + size = vms[0]->size; + addr = vms[0]->addr; + vms[0]->addr = __kasan_unpoison_vmalloc(addr, size, flags); + tag = get_tag(vms[0]->addr); + + for (area = 1 ; area < nr_vms ; area++) { size = vms[area]->size; - addr = vms[area]->addr; - vms[area]->addr = __kasan_unpoison_vmalloc(addr, size, flags); + addr = set_tag(vms[area]->addr, tag); + vms[area]->addr = + __kasan_unpoison_vmalloc(addr, size, flags | KASAN_VMALLOC_KEEP_TAG); } } #endif

5 days, 11 hours

Re: [PATCH 2/2] rust: pci: fix typo in Bar struct's comment

by Danilo Krummrich

(Cc: Greg, Sasha) On Sun Jan 4, 2026 at 1:45 PM CET, Miguel Ojeda wrote: > On Sat, Jan 3, 2026 at 10:16 PM Marko Turk <mt(a)markoturk.info> wrote: >> >> The typo was introduced in the original commit where pci::Bar was added: >> Fixes: bf9651f84b4e ("rust: pci: implement I/O mappable `pci::Bar`") >> >> Should I use that for the Fixes: tag? > > I would add both, since it was added in both and thus different set of > stable releases may need to fix it differently (i.e. before and after > the move). In general I prefer to only add a Fixes: tag for the commit that introduced the issue. > In this case, from a quick look, one is for the current release, so it > doesn't need backport, and the other would need a custom one (since > this commit wouldn't apply) if someone wants to do Option 3. I could be wrong, but I think in trivial cases (such as code moves) the stable team does derive custom commits themselves. @Greg, Sasha: Is this something you prefer to do or is it something you just do because it's easier / quicker than to get back and ask for a custom commit? Again, I could also remember this wrongly, but I think I just recently reviewed such a commit from Sasha. :) >> Should I do that in the same commit? That seems reasonable in this case, please do so.

5 days, 11 hours

[PATCH] xen/scsiback: fix potential memory leak in scsiback_remove()

by Abdun Nihaal

Memory allocated for struct vscsiblk_info in scsiback_probe() is not freed in scsiback_remove() leading to potential memory leaks on remove, as well as in the scsiback_probe() error paths. Fix that by freeing it in scsiback_remove(). Cc: stable(a)vger.kernel.org Fixes: d9d660f6e562 ("xen-scsiback: Add Xen PV SCSI backend driver") Signed-off-by: Abdun Nihaal <nihaal(a)cse.iitm.ac.in> --- Compile tested only. Issue found using static analysis. drivers/xen/xen-scsiback.c | 1 + 1 file changed, 1 insertion(+) diff --git a/drivers/xen/xen-scsiback.c b/drivers/xen/xen-scsiback.c index 0c51edfd13dc..7d5117e5efe0 100644 --- a/drivers/xen/xen-scsiback.c +++ b/drivers/xen/xen-scsiback.c @@ -1262,6 +1262,7 @@ static void scsiback_remove(struct xenbus_device *dev) gnttab_page_cache_shrink(&info->free_pages, 0); dev_set_drvdata(&dev->dev, NULL); + kfree(info); } static int scsiback_probe(struct xenbus_device *dev, -- 2.43.0

5 days, 11 hours

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