linux-kernel - Re: potential NULL dereference in futex_wait_requeue

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Message-ID: <20120718155533.GF16348@mwanda>
Date:	Wed, 18 Jul 2012 18:55:33 +0300
From:	Dan Carpenter <dan.carpenter@...cle.com>
To:	Darren Hart <dvhart@...ux.intel.com>
Cc:	Dave Jones <davej@...hat.com>, linux-kernel@...r.kernel.org
Subject: Re: potential NULL dereference in futex_wait_requeue_pi()

On Wed, Jul 18, 2012 at 08:41:38AM -0700, Darren Hart wrote:
> 
> 
> On 07/18/2012 08:31 AM, Dave Jones wrote:
> > On Wed, Jul 18, 2012 at 05:25:14PM +0300, Dan Carpenter wrote:
> >  > Hi Darren,
> >  > 
> >  > The patch 52400ba94675: "futex: add requeue_pi functionality" from
> >  > Apr 3, 2009, leads to the following warning:
> >  > kernel/futex.c:2373 futex_wait_requeue_pi()
> >  > 	 error: potential NULL dereference 'pi_mutex'.
> > 
> > This sounds like the oops I saw that I reported at https://lkml.org/lkml/2012/7/13/328
> 
> I'm looking into the report Dave sent today (delayed from piles of
> urgent issues after returning from vacation, my apologies).
> 
> Dan, under which workload are you seeing this?
> 

This was a static checker warning.  It was Dave who saw the oops
from syscall fuzzing with trinity.

regards,
dan carpenter

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