smack: do not dereference NULL ipc object
authorAhmed S. Darwish <darwish.07@gmail.com>
Thu, 20 Mar 2008 00:00:51 +0000 (17:00 -0700)
committerLinus Torvalds <torvalds@linux-foundation.org>
Thu, 20 Mar 2008 01:53:36 +0000 (18:53 -0700)
commit1d252fb870aa9cd227c4beb1a226ecd434f57f28
tree4a7b956c01487454b139e1df271518f36ca32285
parent4ebf89845bea44a164d1fbb8fa319379ec7132de
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>
security/smack/smack_lsm.c