memcg: use rcu_dereference to access mm->owner

mm->owner should be accessed with rcu_dereference().

Reported-by: KOSAKI Motohiro <[email protected]>
Signed-off-by: KAMEZAWA Hiroyuki <[email protected]>
Acked-by: Balbir Singh <[email protected]>
Signed-off-by: Andrew Morton <[email protected]>
Signed-off-by: Linus Torvalds <[email protected]>

diff --git a/include/linux/memcontrol.h b/include/linux/memcontrol.h
index 18146c980b68b33d5aafdd8403531f5548dd545a..a9e3b76aa8846d2b6172cfca09a15d6c0d2b4d83 100644 (file)
--- a/include/linux/memcontrol.h
+++ b/include/linux/memcontrol.h
@@ -75,7 +75,7 @@ int mm_match_cgroup(const struct mm_struct *mm, const struct mem_cgroup *cgroup)
 {
        struct mem_cgroup *mem;
        rcu_read_lock();
-       mem = mem_cgroup_from_task((mm)->owner);
+       mem = mem_cgroup_from_task(rcu_dereference((mm)->owner));
        rcu_read_unlock();
        return cgroup == mem;
 }