Description: userfaultfd: release page in error path to avoid BUG_ON
References:
Notes:
 carnil> Introduced in cb658a453b93 ("userfaultfd: shmem: avoid leaking blocks and used
 carnil> blocks in UFFDIO_COPY"). Vulnerable versions: 4.11-rc1.
Bugs:
upstream: released (5.13-rc2) [7ed9d238c7dbb1fdb63ad96a6184985151b0171c]
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: released (5.10.38) [140cfd9980124aecb6c03ef2e69c72d0548744de]
4.19-upstream-stable: released (4.19.191) [07c9b834c97d0fa3402fb7f3f3b32df370a6ff1f]
sid: released (5.10.38-1)
6.1-bookworm-security: N/A "Fixed before branching point"
5.10-bullseye-security: N/A "Fixed before branching point"
4.19-buster-security: released (4.19.194-1)