Description: drm/i915: Flush TLBs before releasing backing store
References:
 https://www.openwall.com/lists/oss-security/2022/01/25/12
Notes:
 carnil> Fixed in 5.16.4 for 5.16.y and 5.15.18 for 5.15.y.
Bugs:
upstream: released (5.17-rc2) [7938d61591d33394a21bdd7797a245b65428f44c]
5.10-upstream-stable: released (5.10.95) [6a6acf927895c38bdd9f3cd76b8dbfc25ac03e88]
4.19-upstream-stable: released (4.19.227) [b188780649081782e341e52223db47c49f172712]
4.9-upstream-stable: released (4.9.299) [84f4ab5b47d955ad2bb30115d7841d3e8f0994f4]
sid: released (5.15.15-2) [bugfix/x86/drm-i915-Flush-TLBs-before-releasing-backing-store.patch]
5.10-bullseye-security: released (5.10.92-2) [bugfix/x86/drm-i915-Flush-TLBs-before-releasing-backing-store.patch]
4.19-buster-security: released (4.19.232-1)
4.9-stretch-security: released (4.9.303-1)