Description: media: pvrusb2: fix uaf in pvr2_context_set_notify
References:
Notes:
 carnil> Introduced in e5be15c63804 ("V4L/DVB (7711): pvrusb2: Fix race on module
 carnil> unload"). Vulnerable versions: 2.6.26-rc1.
Bugs:
upstream: released (6.9-rc1) [0a0b79ea55de8514e1750884e5fec77f9fdd01ee]
6.8-upstream-stable: released (6.8.2) [eaa410e05bdf562c90b23cdf2d9327f9c4625e16]
6.7-upstream-stable: released (6.7.11) [40cd818fae875c424a8335009db33c7b5a07de3a]
6.6-upstream-stable: released (6.6.23) [8e60b99f6b7ccb3badeb512f5eb613ad45904592]
6.1-upstream-stable: released (6.1.83) [3a1ec89708d2e57e2712f46241282961b1a7a475]
5.10-upstream-stable: released (5.10.214) [ab896d93fd6a2cd1afeb034c3cc9226cb499209f]
4.19-upstream-stable: released (4.19.311) [ed8000e1e8e9684ab6c30cf2b526c0cea039929c]
sid: released (6.7.12-1)
6.1-bookworm-security: released (6.1.85-1)
5.10-bullseye-security: needed
4.19-buster-security: needed