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Change History

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

drm/vc4: kms: Clear the HVS FIFO commit pointer once done

Commit 9ec03d7f1ed3 ("drm/vc4: kms: Wait on previous FIFO users before a
commit") introduced a wait on the previous commit done on a given HVS
FIFO.

However, we never cleared that pointer once done. Since
drm_crtc_commit_put can free the drm_crtc_commit structure directly if
we were the last user, this means that it can lead to a use-after free
if we were to duplicate 

kernel.org https://git.kernel.org/stable/c/2931db9a5ed219546cf2ae0546698faf78281b89 [No types assigned]

kernel.org https://git.kernel.org/stable/c/d134c5ff71c7f2320fc7997f2fbbdedf0c76889a [No types assigned]