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authorAhmed S. Darwish <darwish.07@gmail.com>2008-03-19 17:00:51 -0700
committerLinus Torvalds <torvalds@linux-foundation.org>2008-03-19 18:53:36 -0700
commit1d252fb870aa9cd227c4beb1a226ecd434f57f28 (patch)
tree4a7b956c01487454b139e1df271518f36ca32285 /security
parent4ebf89845bea44a164d1fbb8fa319379ec7132de (diff)
downloadlinux-1d252fb870aa9cd227c4beb1a226ecd434f57f28.tar.gz
linux-1d252fb870aa9cd227c4beb1a226ecd434f57f28.tar.xz
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>
Diffstat (limited to 'security')
-rw-r--r--security/smack/smack_lsm.c9
1 files changed, 6 insertions, 3 deletions
diff --git a/security/smack/smack_lsm.c b/security/smack/smack_lsm.c
index 0241fd35..38d7075 100644
--- a/security/smack/smack_lsm.c
+++ b/security/smack/smack_lsm.c
@@ -1508,7 +1508,7 @@ static int smack_shm_associate(struct shmid_kernel *shp, int shmflg)
*/
static int smack_shm_shmctl(struct shmid_kernel *shp, int cmd)
{
- char *ssp = smack_of_shm(shp);
+ char *ssp;
int may;
switch (cmd) {
@@ -1532,6 +1532,7 @@ static int smack_shm_shmctl(struct shmid_kernel *shp, int cmd)
return -EINVAL;
}
+ ssp = smack_of_shm(shp);
return smk_curacc(ssp, may);
}
@@ -1616,7 +1617,7 @@ static int smack_sem_associate(struct sem_array *sma, int semflg)
*/
static int smack_sem_semctl(struct sem_array *sma, int cmd)
{
- char *ssp = smack_of_sem(sma);
+ char *ssp;
int may;
switch (cmd) {
@@ -1645,6 +1646,7 @@ static int smack_sem_semctl(struct sem_array *sma, int cmd)
return -EINVAL;
}
+ ssp = smack_of_sem(sma);
return smk_curacc(ssp, may);
}
@@ -1730,7 +1732,7 @@ static int smack_msg_queue_associate(struct msg_queue *msq, int msqflg)
*/
static int smack_msg_queue_msgctl(struct msg_queue *msq, int cmd)
{
- char *msp = smack_of_msq(msq);
+ char *msp;
int may;
switch (cmd) {
@@ -1752,6 +1754,7 @@ static int smack_msg_queue_msgctl(struct msg_queue *msq, int cmd)
return -EINVAL;
}
+ msp = smack_of_msq(msq);
return smk_curacc(msp, may);
}