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authorKees Cook <keescook@chromium.org>2017-07-12 14:34:53 -0700
committerLinus Torvalds <torvalds@linux-foundation.org>2017-07-12 16:26:01 -0700
commit66470b18179f8839a62b4c20ffd3903a4025fe90 (patch)
tree3ed91f7e0da037c85683fe14fe8d39782b545bd9 /ipc
parent1b4654ef72f61c84704b3c79b50fdeed8747fc56 (diff)
download96b-common-66470b18179f8839a62b4c20ffd3903a4025fe90.tar.gz
ipc/shm: 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/20170525185107.12869-7-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/shm.c9
1 files changed, 7 insertions, 2 deletions
diff --git a/ipc/shm.c b/ipc/shm.c
index 5ef6d31a52c5..566c1e193ee1 100644
--- a/ipc/shm.c
+++ b/ipc/shm.c
@@ -172,6 +172,11 @@ static inline void shm_lock_by_ptr(struct shmid_kernel *ipcp)
ipc_lock_object(&ipcp->shm_perm);
}
+static void __shm_free(struct shmid_kernel *shp)
+{
+ kvfree(shp);
+}
+
static void shm_rcu_free(struct rcu_head *head)
{
struct kern_ipc_perm *ptr = container_of(head, struct kern_ipc_perm,
@@ -179,7 +184,7 @@ static void shm_rcu_free(struct rcu_head *head)
struct shmid_kernel *shp = container_of(ptr, struct shmid_kernel,
shm_perm);
security_shm_free(shp);
- ipc_rcu_free(head);
+ __shm_free(shp);
}
static inline void shm_rmid(struct ipc_namespace *ns, struct shmid_kernel *s)
@@ -557,7 +562,7 @@ static int newseg(struct ipc_namespace *ns, struct ipc_params *params)
shp->shm_perm.security = NULL;
error = security_shm_alloc(shp);
if (error) {
- ipc_rcu_putref(&shp->shm_perm, ipc_rcu_free);
+ __shm_free(shp);
return error;
}