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Date: Sat, 20 Sep 2014 20:59:01 +0200
From: Peter Zijlstra <peterz@infradead.org>
To: Kirill Tkhai <tkhai@yandex.ru>
Cc: linux-kernel@vger.kernel.org, Ingo Molnar <mingo@redhat.com>,
        Kirill Tkhai <ktkhai@parallels.com>
Subject: Re: [PATCH 5/7] sched: Use rq->rd in sched_setaffinity() under RCU
 read lock
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On Sat, Sep 20, 2014 at 08:51:40PM +0400, Kirill Tkhai wrote:
> From: Kirill Tkhai <ktkhai@parallels.com>
> 
> task_rq(p)->rd and task_rq(p)->rd->span may be used-after-free here.
> Probability of NULL pointer derefference isn't zero in this place.

I don't see NULL derefs, just use-after-free.