tree 4a7b956c01487454b139e1df271518f36ca32285
parent 4ebf89845bea44a164d1fbb8fa319379ec7132de
author Ahmed S. Darwish <darwish.07@gmail.com> 1205971251 -0700
committer Linus Torvalds <torvalds@linux-foundation.org> 1205978016 -0700

smack: do not dereference NULL ipc object

In the SYSV ipc msgctl(),semctl(),shmctl() family, if the user passed *_INFO
as the desired operation, no specific object is meant to be controlled and
only system-wide information is returned.  This leads to a NULL IPC object in
the LSM hooks if the _INFO flag is given.

Avoid dereferencing this NULL pointer in Smack ipc *ctl() methods.

Signed-off-by: Ahmed S. Darwish <darwish.07@gmail.com>
Acked-by: Casey Schaufler <casey@schaufler-ca.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>