Re: [PATCH v2] gpiolib: cdev: Fix use after free in lineinfo_changed_notify

[Bartosz Golaszewski]

From: Bartosz Golaszewski <bartosz.golaszewski@xxxxxxxxxx>


On Sun, 05 May 2024 22:11:56 +0800, Zhongqiu Han wrote:
> The use-after-free issue occurs as follows: when the GPIO chip device file
> is being closed by invoking gpio_chrdev_release(), watched_lines is freed
> by bitmap_free(), but the unregistration of lineinfo_changed_nb notifier
> chain failed due to waiting write rwsem. Additionally, one of the GPIO
> chip's lines is also in the release process and holds the notifier chain's
> read rwsem. Consequently, a race condition leads to the use-after-free of
> watched_lines.
> 
> [...]

Applied, thanks!

[1/1] gpiolib: cdev: Fix use after free in lineinfo_changed_notify
      commit: 02f6b0e1ec7e0e7d059dddc893645816552039da

Best regards,
-- 
Bartosz Golaszewski <bartosz.golaszewski@xxxxxxxxxx>