memcg: oom_notify use-after-free fix

[platform/adaptation/renesas_rcar/renesas_kernel.git] / mm / memcontrol.c

diff --git a/mm/memcontrol.c b/mm/memcontrol.c
index 5b6b003..9b35da2 100644 (file)
--- a/mm/memcontrol.c
+++ b/mm/memcontrol.c
@@ -5670,8 +5670,12 @@ static int mem_cgroup_oom_notify_cb(struct mem_cgroup *memcg)
 {
        struct mem_cgroup_eventfd_list *ev;
 
+       spin_lock(&memcg_oom_lock);
+
        list_for_each_entry(ev, &memcg->oom_notify, list)
                eventfd_signal(ev->eventfd, 1);
+
+       spin_unlock(&memcg_oom_lock);
        return 0;
 }