futex: pass nr_wake2 to futex_wake_op

The fourth argument of sys_futex is ignored when op == FUTEX_WAKE_OP,
but futex_wake_op expects it as its nr_wake2 parameter.

The only user of this operation in glibc is always passing 1, so this
bug had no consequences so far.

Signed-off-by: Andreas Schwab <schwab@suse.de>
Cc: Ingo Molnar <mingo@elte.hu>
Signed-off-by: Ulrich Drepper <drepper@redhat.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>

diff --git a/kernel/futex.c b/kernel/futex.c
index 45490bec5831d5a806c1703251f82dec3e599d63..9b57f7e1f7e97a9d9669d12528629bceee81ce3e 100644 (file)
--- a/kernel/futex.c
+++ b/kernel/futex.c
@@ -2061,8 +2061,10 @@ asmlinkage long sys_futex(u32 __user *uaddr, int op, u32 val,
        }
        /*
         * requeue parameter in 'utime' if cmd == FUTEX_REQUEUE.
+        * number of waiters to wake in 'utime' if cmd == FUTEX_WAKE_OP.
         */
-       if (cmd == FUTEX_REQUEUE || cmd == FUTEX_CMP_REQUEUE)
+       if (cmd == FUTEX_REQUEUE || cmd == FUTEX_CMP_REQUEUE ||
+           cmd == FUTEX_WAKE_OP)
                val2 = (u32) (unsigned long) utime;
 
        return do_futex(uaddr, op, val, tp, uaddr2, val2, val3);