Description

In the Linux kernel, the following vulnerability has been resolved: drm/i915: fix race condition UAF in i915_perf_add_config_ioctl Userspace can guess the id value and try to race oa_config object creation with config remove, resulting in a use-after-free if we dereference the object after unlocking the metrics_lock. For that reason, unlocking the metrics_lock must be done after we are done dereferencing the object. [tursulin: Manually added stable tag.] (cherry picked from commit 49f6f6483b652108bcb73accd0204a464b922395)

References 4

• git.kernel.org https://git.kernel.org/stable/c/240b1502708858b5e3f10b6dc5ca3f148a322fef
• git.kernel.org https://git.kernel.org/stable/c/6eeb1cba4c9dc47656ea328afa34953c28783d8c
• git.kernel.org https://git.kernel.org/stable/c/7eb98f5ac551863efe8be810cea1cd5411d677b1
• git.kernel.org https://git.kernel.org/stable/c/dc30c011469165d57af9adac5baff7d767d20e5c

Remediation