Description: NFSv4: Fix a NULL pointer dereference in pnfs_mark_matching_lsegs_return()
References:
Notes:
 carnil> Introduced in de144ff4234f ("NFSv4: Don't discard segments marked for return in
 carnil> _pnfs_return_layout()"). Vulnerable versions: 4.9.269 4.14.233 4.19.191 5.4.118
 carnil> 5.10.36 5.11.20 5.12.3 5.13-rc1.
Bugs:
upstream: released (5.13-rc4) [a421d218603ffa822a0b8045055c03eae394a7eb]
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 (5.10.42) [f9890652185b72b8de9ebeb4406037640b6e1b53]
4.19-upstream-stable: released (4.19.193) [39785761feadf261bc5101372b0b0bbaf6a94494]
sid: released (5.14.6-1)
6.1-bookworm-security: N/A "Fixed before branching point"
5.10-bullseye-security: released (5.10.46-1)
4.19-buster-security: released (4.19.194-1)