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Change History

In the Linux kernel, the following vulnerability has been resolved:

drm/xe/oa: Fix potential UAF in xe_oa_add_config_ioctl()

In xe_oa_add_config_ioctl(), we accessed oa_config->id after dropping
metrics_lock. Since this lock protects the lifetime of oa_config, an
attacker could guess the id and call xe_oa_remove_config_ioctl() with
perfect timing, freeing oa_config before we dereference it, leading to
a potential use-after-free.

Fix this by caching the id in a local variable while holding the lock.

v2: (Matt A)
- Dropped mutex_unlock(&oa->metrics_lock) ordering change from
  xe_oa_remove_config_ioctl()

(cherry picked from commit 28aeaed130e8e587fd1b73b6d66ca41ccc5a1a31)

https://git.kernel.org/stable/c/7cdb9a9da935c687563cc682155461fef5f9b48d

https://git.kernel.org/stable/c/c6d30b65b7a44dac52ad49513268adbf19eab4a2

https://git.kernel.org/stable/c/dcb171931954c51a1a7250d558f02b8f36570783