[tip PATCH V2] futex: fix futex_wait_setup key handling

[Darren Hart]

If the get_futex_key() call were to fail, the existing code would
try and put_futex_key() prior to returning.  This patch makes sure
we only put_futex_key() if get_futex_key() succeeded.

Please apply to -rt and to tip:/core/futexes.

Reported-by: Clark Williams <williams@xxxxxxxxxx>
Signed-off-by: Darren Hart <dvhltc@xxxxxxxxxx>
Cc: Thomas Gleixner <tglx@xxxxxxxxxxxxx>
Cc: Ingo Molnar <mingo@xxxxxxx>
---

 kernel/futex.c |    2 +-
 1 files changed, 1 insertions(+), 1 deletions(-)

diff --git a/kernel/futex.c b/kernel/futex.c
index 185c981..47520d2 100644
--- a/kernel/futex.c
+++ b/kernel/futex.c
@@ -1645,7 +1645,7 @@ retry:
 	q->key = FUTEX_KEY_INIT;
 	ret = get_futex_key(uaddr, fshared, &q->key);
 	if (unlikely(ret != 0))
-		goto out;
+		return ret;
 
 retry_private:
 	*hb = queue_lock(q);

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