Re: [PATCH 5/7] sched: Use rq->rd in sched_setaffinity() under RCU read lock

[Kirill Tkhai]

On 20.09.2014 22:59, Peter Zijlstra wrote:
> On Sat, Sep 20, 2014 at 08:51:40PM +0400, Kirill Tkhai wrote:
>> From: Kirill Tkhai <ktkhai@xxxxxxxxxxxxx>
>>
>> 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.
> 

It's very paranod case :). Two pointers are here:

task_rq(p)->rd (somebody zeroed it "rd") ->span
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