Description: ipc,shm: fix shm_file deletion races
References:
Notes:
 bwh> Bug introduced in 3.12 and then 3.{10,11}.y by commit 8b8d52ac382b
 bwh> ("ipc,shm: introduce lockless functions to obtain the ipc object")
 bwh> or related locking changes.
Bugs:
upstream: released (3.13-rc1) [a399b29dfbaaaf91162b2dc5a5875dd51bbfa2a1]
2.6.32-upstream-stable: N/A (see notes)
sid: released (3.11.10-1)
3.2-wheezy-security: N/A (see notes)
2.6.32-squeeze-security: N/A (see notes)
3.2-upstream-stable: N/A (see notes)