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authorThomas Gleixner <tglx@linutronix.de>2010-02-03 08:33:05 (GMT)
committerThomas Gleixner <tglx@linutronix.de>2010-02-03 14:13:22 (GMT)
commit59647b6ac3050dd964bc556fe6ef22f4db5b935c (patch)
tree5e3b678a1172bce5f61143466bb172727cb13aec /net/packet
parent51246bfd189064079c54421507236fd2723b18f3 (diff)
downloadlinux-fsl-qoriq-59647b6ac3050dd964bc556fe6ef22f4db5b935c.tar.xz
futex: Handle futex value corruption gracefully
The WARN_ON in lookup_pi_state which complains about a mismatch between pi_state->owner->pid and the pid which we retrieved from the user space futex is completely bogus. The code just emits the warning and then continues despite the fact that it detected an inconsistent state of the futex. A conveniant way for user space to spam the syslog. Replace the WARN_ON by a consistency check. If the values do not match return -EINVAL and let user space deal with the mess it created. This also fixes the missing task_pid_vnr() when we compare the pi_state->owner pid with the futex value. Reported-by: Jermome Marchand <jmarchan@redhat.com> Signed-off-by: Thomas Gleixner <tglx@linutronix.de> Acked-by: Darren Hart <dvhltc@us.ibm.com> Acked-by: Peter Zijlstra <a.p.zijlstra@chello.nl> Cc: <stable@kernel.org>
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