Description: RDMA/ucma: Rework ucma_migrate_id() to avoid races with destroy
References:
 https://sites.google.com/view/syzscope/kasan-use-after-free-read-in-ucma_close-2
 https://syzkaller.appspot.com/bug?id=457491c4672d7b52c1007db213d93e47c711fae6
Notes:
Bugs:
upstream: released (5.10-rc1) [f5449e74802c1112dea984aec8af7a33c4516af1]
6.1-upstream-stable: N/A "Fixed before branch point"
5.10-upstream-stable: N/A "Fixed before branching point"
4.19-upstream-stable: needed
4.9-upstream-stable: ignored "EOL"
sid: released (5.10.4-1)
6.1-bookworm-security: N/A "Fixed before branch point"
5.10-bullseye-security: N/A "Fixed before branching point"
4.19-buster-security: needed
4.9-stretch-security: ignored "EOL"