Description: drm/prime: Fix use after free in mmap with drm_gem_ttm_mmap
References:
Notes:
 carnil> Introduced in 9786b65bc61a ("drm/ttm: fix mmap refcounting"). Vulnerable
 carnil> versions: 5.5-rc1.
Bugs:
upstream: released (5.16-rc1) [8244a3bc27b3efd057da154b8d7e414670d5044f]
6.8-upstream-stable: N/A "Fixed before branching point"
6.7-upstream-stable: N/A "Fixed before branching point"
6.6-upstream-stable: N/A "Fixed before branching point"
6.1-upstream-stable: N/A "Fixed before branching point"
5.10-upstream-stable: needed
4.19-upstream-stable: N/A "Vulnerable code not present"
sid: released (5.15.5-1)
6.1-bookworm-security: N/A "Fixed before branching point"
5.10-bullseye-security: needed
4.19-buster-security: N/A "Vulnerable code not present"