1 files changed, 11 insertions, 1 deletions

diff --git a/kernel/signal.c b/kernel/signal.c
index 54820984a872..19e35135fc60 100644
--- a/kernel/signal.c
+++ b/kernel/signal.c
@@ -1275,7 +1275,17 @@ struct sighand_struct *__lock_task_sighand(struct task_struct *tsk,
                         local_irq_restore(*flags);
                         break;
                 }
-
+                /*
+                 * This sighand can be already freed and even reused, but
+                 * we rely on SLAB_DESTROY_BY_RCU and sighand_ctor() which
+                 * initializes ->siglock: this slab can't go away, it has
+                 * the same object type, ->siglock can't be reinitialized.
+                 *
+                 * We need to ensure that tsk->sighand is still the same
+                 * after we take the lock, we can race with de_thread() or
+                 * __exit_signal(). In the latter case the next iteration
+                 * must see ->sighand == NULL.
+                 */
                 spin_lock(&sighand->siglock);
                 if (likely(sighand == tsk->sighand)) {
                         rcu_read_unlock();