On Sat, Sep 20, 2014 at 11:05:46PM +0400, Kirill Tkhai wrote: > 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 <ktk...@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. > > > > It's very paranod case :). Two pointers are here: > > task_rq(p)->rd (somebody zeroed it "rd") ->span
What you're saying is: due to the reuse someone might have put a NULL in there. Which is fair, but I'd still call it use-after-free because that is the first order problem. Dereferencing 'unknown' memory can of course cause all kinds of 'fun' problems :-) -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majord...@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
