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| author | Kees Cook <keescook@chromium.org> | 2017-07-12 14:34:56 -0700 |
|---|---|---|
| committer | Linus Torvalds <torvalds@linux-foundation.org> | 2017-07-12 16:26:01 -0700 |
| commit | 9ef5932f8a1134b9d93676ee26701b2be90c7a95 (patch) | |
| tree | 3cffc8fe88d4f1c59778ebb9a4a83feba1c7f001 /ipc | |
| parent | 66470b18179f8839a62b4c20ffd3903a4025fe90 (diff) | |
| download | lwn-9ef5932f8a1134b9d93676ee26701b2be90c7a95.tar.gz lwn-9ef5932f8a1134b9d93676ee26701b2be90c7a95.zip | |
ipc/msg: do not use ipc_rcu_free()
Avoid using ipc_rcu_free, since it just re-finds the original structure
pointer. For the pre-list-init failure path, there is no RCU needed,
since it was just allocated. It can be directly freed.
Link: http://lkml.kernel.org/r/20170525185107.12869-8-manfred@colorfullife.com
Signed-off-by: Kees Cook <keescook@chromium.org>
Signed-off-by: Manfred Spraul <manfred@colorfullife.com>
Cc: Davidlohr Bueso <dave@stgolabs.net>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Diffstat (limited to 'ipc')
| -rw-r--r-- | ipc/msg.c | 9 |
1 files changed, 7 insertions, 2 deletions
diff --git a/ipc/msg.c b/ipc/msg.c index 0ed7dae7d4e8..25d43e27ef12 100644 --- a/ipc/msg.c +++ b/ipc/msg.c @@ -95,13 +95,18 @@ static inline void msg_rmid(struct ipc_namespace *ns, struct msg_queue *s) ipc_rmid(&msg_ids(ns), &s->q_perm); } +static void __msg_free(struct msg_queue *msq) +{ + kvfree(msq); +} + static void msg_rcu_free(struct rcu_head *head) { struct kern_ipc_perm *p = container_of(head, struct kern_ipc_perm, rcu); struct msg_queue *msq = container_of(p, struct msg_queue, q_perm); security_msg_queue_free(msq); - ipc_rcu_free(head); + __msg_free(msq); } /** @@ -131,7 +136,7 @@ static int newque(struct ipc_namespace *ns, struct ipc_params *params) msq->q_perm.security = NULL; retval = security_msg_queue_alloc(msq); if (retval) { - ipc_rcu_putref(&msq->q_perm, ipc_rcu_free); + __msg_free(msq); return retval; } |