From: Luca Ceresoli <luca.ceresoli@bootlin.com> mainline inclusion from mainline-v6.15-rc6 commit f063a28002e3350088b4577c5640882bf4ea17ea category: bugfix bugzilla: https://gitee.com/src-openeuler/kernel/issues/IC992V CVE: CVE-2025-37968 Reference: https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?i... -------------------------------- The threaded IRQ function in this driver is reading the flag twice: once to lock a mutex and once to unlock it. Even though the code setting the flag is designed to prevent it, there are subtle cases where the flag could be true at the mutex_lock stage and false at the mutex_unlock stage. This results in the mutex not being unlocked, resulting in a deadlock. Fix it by making the opt3001_irq() code generally more robust, reading the flag into a variable and using the variable value at both stages. Fixes: 94a9b7b1809f ("iio: light: add support for TI's opt3001 light sensor") Cc: stable@vger.kernel.org Signed-off-by: Luca Ceresoli <luca.ceresoli@bootlin.com> Link: https://patch.msgid.link/20250321-opt3001-irq-fix-v1-1-6c520d851562@bootlin.... Signed-off-by: Jonathan Cameron <Jonathan.Cameron@huawei.com> Conflicts: drivers/iio/light/opt3001.c [As context diff] Signed-off-by: Ye Bin <yebin10@huawei.com> --- drivers/iio/light/opt3001.c | 5 +++-- 1 file changed, 3 insertions(+), 2 deletions(-) diff --git a/drivers/iio/light/opt3001.c b/drivers/iio/light/opt3001.c index dc529cbe3805..25a45c4251fb 100644 --- a/drivers/iio/light/opt3001.c +++ b/drivers/iio/light/opt3001.c @@ -692,8 +692,9 @@ static irqreturn_t opt3001_irq(int irq, void *_iio) struct opt3001 *opt = iio_priv(iio); int ret; bool wake_result_ready_queue = false; + bool ok_to_ignore_lock = opt->ok_to_ignore_lock; - if (!opt->ok_to_ignore_lock) + if (!ok_to_ignore_lock) mutex_lock(&opt->lock); ret = i2c_smbus_read_word_swapped(opt->client, OPT3001_CONFIGURATION); @@ -730,7 +731,7 @@ static irqreturn_t opt3001_irq(int irq, void *_iio) } out: - if (!opt->ok_to_ignore_lock) + if (!ok_to_ignore_lock) mutex_unlock(&opt->lock); if (wake_result_ready_queue) -- 2.34.1