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[PATCH] backlight: led_bl: Hold led_access lock when calling led_sysfs_disable()

by Herve Codina

Lockdep detects the following issue on led-backlight removal: [ 142.315935] ------------[ cut here ]------------ [ 142.315954] WARNING: CPU: 2 PID: 292 at drivers/leds/led-core.c:455 led_sysfs_enable+0x54/0x80 ... [ 142.500725] Call trace: [ 142.503176] led_sysfs_enable+0x54/0x80 (P) [ 142.507370] led_bl_remove+0x80/0xa8 [led_bl] [ 142.511742] platform_remove+0x30/0x58 [ 142.515501] device_remove+0x54/0x90 ... Indeed, led_sysfs_enable() has to be called with the led_access lock held. Hold the lock when calling led_sysfs_disable(). Fixes: ae232e45acf9 ("backlight: add led-backlight driver") Cc: stable(a)vger.kernel.org Signed-off-by: Herve Codina <herve.codina(a)bootlin.com> --- drivers/video/backlight/led_bl.c | 5 ++++- 1 file changed, 4 insertions(+), 1 deletion(-) diff --git a/drivers/video/backlight/led_bl.c b/drivers/video/backlight/led_bl.c index ae34d1ecbfbe..d2db157b2c29 100644 --- a/drivers/video/backlight/led_bl.c +++ b/drivers/video/backlight/led_bl.c @@ -229,8 +229,11 @@ static void led_bl_remove(struct platform_device *pdev) backlight_device_unregister(bl); led_bl_power_off(priv); - for (i = 0; i < priv->nb_leds; i++) + for (i = 0; i < priv->nb_leds; i++) { + mutex_lock(&priv->leds[i]->led_access); led_sysfs_enable(priv->leds[i]); + mutex_unlock(&priv->leds[i]->led_access); + } } static const struct of_device_id led_bl_of_match[] = { -- 2.47.1

1 week, 1 day

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[PATCH V2] usb: gadget: udc: renesas_usb3: Fix compiler warning

by guoren＠kernel.org

From: Guo Ren <guoren(a)linux.alibaba.com> drivers/usb/gadget/udc/renesas_usb3.c: In function 'renesas_usb3_probe': drivers/usb/gadget/udc/renesas_usb3.c:2638:73: warning: '%d' directive output may be truncated writing between 1 and 11 bytes into a region of size 6 [-Wformat-truncation=] 2638 | snprintf(usb3_ep->ep_name, sizeof(usb3_ep->ep_name), "ep%d", i); ^~~~~~~~~~~~~~~~~~~~~~~~ ^~ ^ Fixes: 746bfe63bba3 ("usb: gadget: renesas_usb3: add support for Renesas USB3.0 peripheral controller") Cc: stable(a)vger.kernel.org Reported-by: kernel test robot <lkp(a)intel.com> Closes: https://lore.kernel.org/oe-kbuild-all/202501201409.BIQPtkeB-lkp@intel.com/ Signed-off-by: Guo Ren <guoren(a)linux.alibaba.com> Signed-off-by: Guo Ren <guoren(a)kernel.org> --- drivers/usb/gadget/udc/renesas_usb3.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) diff --git a/drivers/usb/gadget/udc/renesas_usb3.c b/drivers/usb/gadget/udc/renesas_usb3.c index fce5c41d9f29..89b304cf6d03 100644 --- a/drivers/usb/gadget/udc/renesas_usb3.c +++ b/drivers/usb/gadget/udc/renesas_usb3.c @@ -310,7 +310,7 @@ struct renesas_usb3_request { struct list_head queue; }; -#define USB3_EP_NAME_SIZE 8 +#define USB3_EP_NAME_SIZE 16 struct renesas_usb3_ep { struct usb_ep ep; struct renesas_usb3 *usb3; -- 2.40.1

1 week, 1 day

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[PATCH] usb: gadget: udc: renesas_usb3: Fix compiler warning

by guoren＠kernel.org

From: Guo Ren <guoren(a)linux.alibaba.com> drivers/usb/gadget/udc/renesas_usb3.c: In function 'renesas_usb3_probe': drivers/usb/gadget/udc/renesas_usb3.c:2638:73: warning: '%d' directive output may be truncated writing between 1 and 11 bytes into a region of size 6 [-Wformat-truncation=] 2638 | snprintf(usb3_ep->ep_name, sizeof(usb3_ep->ep_name), "ep%d", i); ^~~~~~~~~~~~~~~~~~~~~~~~ ^~ ^ Fixes: 8292493c22c8 ("riscv: Kconfig.socs: Add ARCH_RENESAS kconfig option") Cc: stable(a)vger.kernel.org Reported-by: kernel test robot <lkp(a)intel.com> Closes: https://lore.kernel.org/oe-kbuild-all/202501201409.BIQPtkeB-lkp@intel.com/ Signed-off-by: Guo Ren <guoren(a)linux.alibaba.com> Signed-off-by: Guo Ren <guoren(a)kernel.org> --- drivers/usb/gadget/udc/renesas_usb3.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) diff --git a/drivers/usb/gadget/udc/renesas_usb3.c b/drivers/usb/gadget/udc/renesas_usb3.c index fce5c41d9f29..89b304cf6d03 100644 --- a/drivers/usb/gadget/udc/renesas_usb3.c +++ b/drivers/usb/gadget/udc/renesas_usb3.c @@ -310,7 +310,7 @@ struct renesas_usb3_request { struct list_head queue; }; -#define USB3_EP_NAME_SIZE 8 +#define USB3_EP_NAME_SIZE 16 struct renesas_usb3_ep { struct usb_ep ep; struct renesas_usb3 *usb3; -- 2.40.1

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Patch "net/sched: Fix mirred deadlock on device recursion" should probably be ported to 5.4, 5.10 and 5.15 LTS.

by Xingyu Li

Hi, We noticed that the patch 0f022d32c3ec should be probably ported to 6.1 and 6.6 LTS according to the bug introducing commit. Also, it can be applied to the latest version of these two LTS branches without conflicts. Its bug introducing commit is 3bcb846ca4cf. According to our manual analysis, the vulnerability is a deadlock caused by recursive locking of the qdisc lock (`sch->q.lock`) when packets are redirected in a loop (e.g., mirroring or redirecting packets to the same device). This happens because the same qdisc lock is attempted to be acquired multiple times by the same CPU, leading to a deadlock. The commit 3bcb846ca4cf removes the `spin_trylock()` in `net_tx_action()` and replaces it with `spin_lock()`. By doing so, it eliminates the non-blocking lock attempt (`spin_trylock()`), which would fail if the lock was already held, preventing recursive locking. The `spin_lock()` will block (wait) if the lock is already held, allowing for the possibility of the same CPU attempting to acquire the same lock recursively, leading to a deadlock. The patch adds an `owner` field to the `Qdisc` structure to track the CPU that currently owns the qdisc. Before enqueueing a packet to the qdisc, it checks if the current CPU is the owner. If so, it drops the packet to prevent the recursive locking. This effectively prevents the deadlock by ensuring that the same CPU doesn't attempt to acquire the lock recursively. -- Yours sincerely, Xingyu

1 week, 1 day

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Patch "tipc: fix kernel warning when sending SYN message" should be probably ported to 5.10 and 5.15 LTS

by Xingyu Li

Hi, We noticed that the patch 11a4d6f67cf5 should be ported to 5.10 and 5.15 LTS according to the bug introducing commit. Also, it can be applied to the latest version of these two LTS branches without conflicts. Its bug introducing commit is f25dcc7687d4. The kernel warning and stack trace indicate a problem when sending a SYN message in TIPC (Transparent Inter-Process Communication). The issue arises because `copy_from_iter()` is being called with an uninitialized `iov_iter` structure, leading to invalid memory operations. The commit (`f25dcc7687d4`) introduces the vulnerability by replacing the old data copying mechanisms with the new `copy_from_iter()` function without ensuring that the `iov_iter` structure is properly initialized in all code paths. The patch adds initialization of `iov_iter` with "iov_iter_kvec(&m.msg_iter, ITER_SOURCE, NULL, 0, 0);", which ensures that even when there's no data to send, the `iov_iter` is correctly set up, preventing the kernel warning/crash when `copy_from_iter()` is called. -- Yours sincerely, Xingyu

1 week, 1 day

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Patch "net: flow_dissector: use DEBUG_NET_WARN_ON_ONCE" should probably be ported to 5.4, 5.10 and 5.15 LTS.

by Xingyu Li

Hi, We noticed that the patch 120f1c857a73 should be ported to 5.4, 5.10 and 5.15 LTS according to bug introducing commits. Also, they can be applied to the latest version of these three branches without conflicting. Its bug introducing commit is 9b52e3f267a6. According to our manual analysis, the commit (9b52e3f267a6) introduced a `WARN_ON_ONCE(!net);` statement in the `__skb_flow_dissect` function within `net/core/flow_dissector.c`. This change began triggering warnings (splat messages) when `net` is `NULL`, which can happen in legitimate use cases, such as when `__skb_get_hash()` is called by the nftables tracing infrastructure to identify packets in traces. The patch provided replaces this `WARN_ON_ONCE(!net);` with `DEBUG_NET_WARN_ON_ONCE(!net);`, which is more appropriate for situations where `net` can be `NULL` without it indicating a critical issue. This change prevents unnecessary warning messages from appearing, which can clutter logs and potentially mask real issues. Therefore, the prior commit introduced the issue (the unnecessary warnings when `net` is `NULL`), and the patch fixes this by adjusting the warning mechanism. -- Yours sincerely, Xingyu

1 week, 1 day

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[PATCH 5.15.y] regmap: detach regmap from dev on regmap_exit

by Tzung-Bi Shih

From: Cosmin Tanislav <demonsingur(a)gmail.com> commit 3061e170381af96d1e66799d34264e6414d428a7 upstream. This is a reland commit: - f373a189817584d0af5f922e91cad40e45f12314 backported it incorrectly. - 7aee9bcc5c56086af6c063b4aaef59d4e42e0a69 reverted the wrong commit. - This re-backports it. At the end of __regmap_init(), if dev is not NULL, regmap_attach_dev() is called, which adds a devres reference to the regmap, to be able to retrieve a dev's regmap by name using dev_get_regmap(). When calling regmap_exit, the opposite does not happen, and the reference is kept until the dev is detached. Add a regmap_detach_dev() function and call it in regmap_exit() to make sure that the devres reference is not kept. Cc: stable(a)vger.kernel.org Fixes: 72b39f6f2b5a ("regmap: Implement dev_get_regmap()") Signed-off-by: Cosmin Tanislav <demonsingur(a)gmail.com> Rule: add Link: https://lore.kernel.org/stable/20241128130554.362486-1-demonsingur%40gmail.… Link: https://patch.msgid.link/20241128131625.363835-1-demonsingur@gmail.com Signed-off-by: Mark Brown <broonie(a)kernel.org> Link: https://lore.kernel.org/r/20250115033314.2540588-1-tzungbi@kernel.org Link: https://lore.kernel.org/r/20250115033244.2540522-1-tzungbi@kernel.org Signed-off-by: Tzung-Bi Shih <tzungbi(a)kernel.org> --- drivers/base/regmap/regmap.c | 12 ++++++++++++ 1 file changed, 12 insertions(+) diff --git a/drivers/base/regmap/regmap.c b/drivers/base/regmap/regmap.c index 85d324fd6a87..6d94ad8bf1eb 100644 --- a/drivers/base/regmap/regmap.c +++ b/drivers/base/regmap/regmap.c @@ -663,6 +663,17 @@ int regmap_attach_dev(struct device *dev, struct regmap *map, } EXPORT_SYMBOL_GPL(regmap_attach_dev); +static int dev_get_regmap_match(struct device *dev, void *res, void *data); + +static int regmap_detach_dev(struct device *dev, struct regmap *map) +{ + if (!dev) + return 0; + + return devres_release(dev, dev_get_regmap_release, + dev_get_regmap_match, (void *)map->name); +} + static enum regmap_endian regmap_get_reg_endian(const struct regmap_bus *bus, const struct regmap_config *config) { @@ -1531,6 +1542,7 @@ void regmap_exit(struct regmap *map) { struct regmap_async *async; + regmap_detach_dev(map->dev, map); regcache_exit(map); regmap_debugfs_exit(map); regmap_range_exit(map); -- 2.48.0.rc2.279.g1de40edade-goog

1 week, 1 day

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[PATCH 6.1.y] regmap: detach regmap from dev on regmap_exit

by Tzung-Bi Shih

From: Cosmin Tanislav <demonsingur(a)gmail.com> commit 3061e170381af96d1e66799d34264e6414d428a7 upstream. This is a reland commit: - 48dc44f3c1afa29390cb2fbc8badad1b1111cea4 backported it incorrectly. - 276185236bd8281dca88863b751b481e027cada7 reverted the wrong commit. - This re-backports it. At the end of __regmap_init(), if dev is not NULL, regmap_attach_dev() is called, which adds a devres reference to the regmap, to be able to retrieve a dev's regmap by name using dev_get_regmap(). When calling regmap_exit, the opposite does not happen, and the reference is kept until the dev is detached. Add a regmap_detach_dev() function and call it in regmap_exit() to make sure that the devres reference is not kept. Cc: stable(a)vger.kernel.org Fixes: 72b39f6f2b5a ("regmap: Implement dev_get_regmap()") Signed-off-by: Cosmin Tanislav <demonsingur(a)gmail.com> Rule: add Link: https://lore.kernel.org/stable/20241128130554.362486-1-demonsingur%40gmail.… Link: https://patch.msgid.link/20241128131625.363835-1-demonsingur@gmail.com Signed-off-by: Mark Brown <broonie(a)kernel.org> Link: https://lore.kernel.org/r/20250115033244.2540522-1-tzungbi@kernel.org Signed-off-by: Tzung-Bi Shih <tzungbi(a)kernel.org> --- drivers/base/regmap/regmap.c | 12 ++++++++++++ 1 file changed, 12 insertions(+) diff --git a/drivers/base/regmap/regmap.c b/drivers/base/regmap/regmap.c index 15b37a4163d3..f0e314abcafc 100644 --- a/drivers/base/regmap/regmap.c +++ b/drivers/base/regmap/regmap.c @@ -652,6 +652,17 @@ int regmap_attach_dev(struct device *dev, struct regmap *map, } EXPORT_SYMBOL_GPL(regmap_attach_dev); +static int dev_get_regmap_match(struct device *dev, void *res, void *data); + +static int regmap_detach_dev(struct device *dev, struct regmap *map) +{ + if (!dev) + return 0; + + return devres_release(dev, dev_get_regmap_release, + dev_get_regmap_match, (void *)map->name); +} + static enum regmap_endian regmap_get_reg_endian(const struct regmap_bus *bus, const struct regmap_config *config) { @@ -1536,6 +1547,7 @@ void regmap_exit(struct regmap *map) { struct regmap_async *async; + regmap_detach_dev(map->dev, map); regcache_exit(map); regmap_debugfs_exit(map); regmap_range_exit(map); -- 2.48.0.rc2.279.g1de40edade-goog

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[PATCH] atm/fore200e: Fix possible data race in fore200e_open()

by Gui-Dong Han

Protect access to fore200e->available_cell_rate with rate_mtx lock to prevent potential data race. The field fore200e.available_cell_rate is generally protected by the lock fore200e.rate_mtx when accessed. In all other read and write cases, this field is consistently protected by the lock, except for this case and during initialization. This potential bug was detected by our experimental static analysis tool, which analyzes locking APIs and paired functions to identify data races and atomicity violations. Fixes: 1da177e4c3f4 ("Linux-2.6.12-rc2") Cc: stable(a)vger.kernel.org Signed-off-by: Gui-Dong Han <2045gemini(a)gmail.com> --- drivers/atm/fore200e.c | 2 ++ 1 file changed, 2 insertions(+) diff --git a/drivers/atm/fore200e.c b/drivers/atm/fore200e.c index 4fea1149e003..f62e38571440 100644 --- a/drivers/atm/fore200e.c +++ b/drivers/atm/fore200e.c @@ -1374,7 +1374,9 @@ fore200e_open(struct atm_vcc *vcc) vcc->dev_data = NULL; + mutex_lock(&fore200e->rate_mtx); fore200e->available_cell_rate += vcc->qos.txtp.max_pcr; + mutex_unlock(&fore200e->rate_mtx); kfree(fore200e_vcc); return -EINVAL; -- 2.25.1

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[PATCH 0/4] media: nuvoton: Fix some reference handling issues

by Ricardo Ribalda

When trying out 6.13 cocci, some bugs were found. The fixes without using cleanup.h should be backported. The last two patches make use of cleanup.h to avoid this kind of errors in the future. Signed-off-by: Ricardo Ribalda <ribalda(a)chromium.org> --- Ricardo Ribalda (4): media: nuvoton: Fix reference handling of ece_pdev media: nuvoton: Fix reference handling of ece_node media: nuvoton: Use cleanup.h macros for device_node media: nuvoton: Use cleanup.h macros for put_device drivers/media/platform/nuvoton/npcm-video.c | 6 +++--- 1 file changed, 3 insertions(+), 3 deletions(-) --- base-commit: c4b7779abc6633677e6edb79e2809f4f61fde157 change-id: 20250121-nuvoton-fe870cbeffb6 Best regards, -- Ricardo Ribalda <ribalda(a)chromium.org>

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