[patch -next] ipcns: use after free in free_ipc_ns()

[Dan Carpenter]

We dereference "ns" after it has been freed.  This was introduced in
b515498f5bb5 "userns: add a user namespace owner of ipc ns".

Signed-off-by: Dan Carpenter <error27@xxxxxxxxx>

diff --git a/ipc/namespace.c b/ipc/namespace.c
index 3c3e522..8054c8e 100644
--- a/ipc/namespace.c
+++ b/ipc/namespace.c
@@ -104,7 +104,6 @@ static void free_ipc_ns(struct ipc_namespace *ns)
 	sem_exit_ns(ns);
 	msg_exit_ns(ns);
 	shm_exit_ns(ns);
-	kfree(ns);
 	atomic_dec(&nr_ipc_ns);
 
 	/*
@@ -113,6 +112,7 @@ static void free_ipc_ns(struct ipc_namespace *ns)
 	 */
 	ipcns_notify(IPCNS_REMOVED);
 	put_user_ns(ns->user_ns);
+	kfree(ns);
 }
 
 /*
--
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majordomo@xxxxxxxxxxxxxxx
More majordomo info at  http://vger.kernel.org/majordomo-info.html
Please read the FAQ at  http://www.tux.org/lkml/