From: Thomas Gleixner tglx@linutronix.de
[ Upstream commit 04b79c55201f02ffd675e1231d731365e335c307 ]
If that unexpected case of inconsistent arguments ever happens then the futex state is left completely inconsistent and the printk is not really helpful. Replace it with a warning and make the state consistent.
Signed-off-by: Thomas Gleixner tglx@linutronix.de Acked-by: Peter Zijlstra (Intel) peterz@infradead.org Cc: stable@vger.kernel.org Signed-off-by: Lee Jones lee.jones@linaro.org Signed-off-by: Greg Kroah-Hartman gregkh@linuxfoundation.org --- kernel/futex.c | 10 +++------- 1 file changed, 3 insertions(+), 7 deletions(-)
--- a/kernel/futex.c +++ b/kernel/futex.c @@ -2447,14 +2447,10 @@ static int fixup_owner(u32 __user *uaddr
/* * Paranoia check. If we did not take the lock, then we should not be - * the owner of the rt_mutex. + * the owner of the rt_mutex. Warn and establish consistent state. */ - if (rt_mutex_owner(&q->pi_state->pi_mutex) == current) { - printk(KERN_ERR "fixup_owner: ret = %d pi-mutex: %p " - "pi-state %p\n", ret, - q->pi_state->pi_mutex.owner, - q->pi_state->owner); - } + if (WARN_ON_ONCE(rt_mutex_owner(&q->pi_state->pi_mutex) == current)) + return fixup_pi_state_owner(uaddr, q, current);
out: return ret ? ret : locked;