[PATCH] kernel/futex.c: fix incorrect 'should_fail_futex' handling

[mateusznosek0]

From: Mateusz Nosek <mateusznos...@gmail.com>

Previously if 'futex_should_fail' returned true, then only 'ret' variable
was set, which was later overwritten without being read. The patch fixes
the problem.

Signed-off-by: Mateusz Nosek <mateusznos...@gmail.com>
---
 kernel/futex.c | 4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)

diff --git a/kernel/futex.c b/kernel/futex.c
index a5876694a60e..39681bf8b06c 100644
--- a/kernel/futex.c
+++ b/kernel/futex.c
@@ -1502,8 +1502,10 @@ static int wake_futex_pi(u32 __user *uaddr, u32 uval, 
struct futex_pi_state *pi_
         */
        newval = FUTEX_WAITERS | task_pid_vnr(new_owner);
 
-       if (unlikely(should_fail_futex(true)))
+       if (unlikely(should_fail_futex(true))) {
                ret = -EFAULT;
+               goto out_unlock;
+       }
 
        ret = cmpxchg_futex_value_locked(&curval, uaddr, uval, newval);
        if (!ret && (curval != uval)) {
-- 
2.20.1