CVE

CVE-2023-52847

Date: (C)2024-05-22   (M)2024-05-24

In the Linux kernel, the following vulnerability has been resolved: media: bttv: fix use after free error due to btv->timeout timer There may be some a race condition between timer function bttv_irq_timeout and bttv_remove. The timer is setup in probe and there is no timer_delete operation in remove function. When it hit kfree btv, the function might still be invoked, which will cause use after free bug. This bug is found by static analysis, it may be false positive. Fix it by adding del_timer_sync invoking to the remove function. cpu0 cpu1 bttv_probe ->timer_setup ->bttv_set_dma ->mod_timer; bttv_remove ->kfree(btv); ->bttv_irq_timeout ->USE btv

Reference:

https://git.kernel.org/stable/c/1871014d6ef4812ad11ef7d838d73ce09d632267

https://git.kernel.org/stable/c/20568d06f6069cb835e05eed432edf962645d226

https://git.kernel.org/stable/c/2f3d9198cdae1cb079ec8652f4defacd481eab2b

https://git.kernel.org/stable/c/51c94256a83fe4e17406c66ff3e1ad7d242d8574

https://git.kernel.org/stable/c/847599fffa528b2cdec4e21b6bf7586dad982132

https://git.kernel.org/stable/c/b35fdade92c5058a5e727e233fe263b828de2c9a

https://git.kernel.org/stable/c/bbc3b8dd2cb7817e703f112d988e4f4728f0f2a9

https://git.kernel.org/stable/c/bd5b50b329e850d467e7bcc07b2b6bde3752fbda