Cc: "Eric W. Biederman" <ebiederm@xmission.com>

Cc: Ben Blum <bblum@google.com>
Cc: Li Zefan <lizf@cn.fujitsu.com>
Cc: Matt Helsley <matthltc@us.ibm.com>
Cc: Oleg Nesterov <oleg@redhat.com>
Cc: Paul Menage <menage@google.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>

kernel/cgroup.c

@@ -1557,7 +1557,7 @@ struct sighand_struct *threadgroup_fork_lock(struct task_struct *tsk)
 		rcu_read_lock();
 		list_for_each_entry_rcu(p, &tsk->thread_group, thread_group) {
 			if (p->sighand) {
-				sighand = tsk->sighand;
+				sighand = p->sighand;
 				break;
 			}
 		}