futex: Fix incorrect should_fail_futex() handling

If should_futex_fail() returns true in futex_wake_pi(), then the 'ret'
variable is set to -EFAULT and then immediately overwritten. So the failure
injection is non-functional.

Fix it by actually leaving the function and returning -EFAULT.

The Fixes tag is kinda blury because the initial commit which introduced
failure injection was already sloppy, but the below mentioned commit broke
it completely.

[ tglx: Massaged changelog ]

Fixes: 6b4f4bc9cb22 ("locking/futex: Allow low-level atomic operations to return -EAGAIN")
Signed-off-by: Mateusz Nosek <mateusznosek0@gmail.com>
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Link: https://lore.kernel.org/r/20200927000858.24219-1-mateusznosek0@gmail.com

diff --git a/kernel/futex.c b/kernel/futex.c
index a587669..39681bf 100644 (file)
--- 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)) {