1 files changed, 15 insertions, 3 deletions

diff --git a/kernel/futex.c b/kernel/futex.c
index 4949d336d88d..5c88839bd993 100644
--- a/kernel/futex.c
+++ b/kernel/futex.c
@@ -1791,6 +1791,7 @@ static int futex_wait(u32 __user *uaddr, int fshared,
                                              current->timer_slack_ns);
         }
 
+retry:
         /* Prepare to wait on uaddr. */
         ret = futex_wait_setup(uaddr, val, fshared, &q, &hb);
         if (ret)
@@ -1808,9 +1809,14 @@ static int futex_wait(u32 __user *uaddr, int fshared,
                 goto out_put_key;
 
         /*
-         * We expect signal_pending(current), but another thread may
-         * have handled it for us already.
+         * We expect signal_pending(current), but we might be the
+         * victim of a spurious wakeup as well.
          */
+        if (!signal_pending(current)) {
+                put_futex_key(fshared, &q.key);
+                goto retry;
+        }
+
         ret = -ERESTARTSYS;
         if (!abs_time)
                 goto out_put_key;
@@ -2118,9 +2124,11 @@ int handle_early_requeue_pi_wakeup(struct futex_hash_bucket *hb,
                  */
                 plist_del(&q->list, &q->list.plist);
 
+                /* Handle spurious wakeups gracefully */
+                ret = -EAGAIN;
                 if (timeout && !timeout->task)
                         ret = -ETIMEDOUT;
-                else
+                else if (signal_pending(current))
                         ret = -ERESTARTNOINTR;
         }
         return ret;
@@ -2198,6 +2206,7 @@ static int futex_wait_requeue_pi(u32 __user *uaddr, int fshared,
         debug_rt_mutex_init_waiter(&rt_waiter);
         rt_waiter.task = NULL;
 
+retry:
         key2 = FUTEX_KEY_INIT;
         ret = get_futex_key(uaddr2, fshared, &key2, VERIFY_WRITE);
         if (unlikely(ret != 0))
@@ -2292,6 +2301,9 @@ out_put_keys:
 out_key2:
         put_futex_key(fshared, &key2);
 
+        /* Spurious wakeup ? */
+        if (ret == -EAGAIN)
+                goto retry;
 out:
         if (to) {
                 hrtimer_cancel(&to->timer);