linux-kernel - Re: mm: BUG in resv_map

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Message-Id: <20170328163823.3a0445a058670be9254e115c@linux-foundation.org>
Date:   Tue, 28 Mar 2017 16:38:23 -0700
From:   Andrew Morton <akpm@...ux-foundation.org>
To:     Dmitry Vyukov <dvyukov@...gle.com>
Cc:     nyc@...omorphy.com, Michal Hocko <mhocko@...e.com>,
        Mike Kravetz <mike.kravetz@...cle.com>,
        "Kirill A. Shutemov" <kirill.shutemov@...ux.intel.com>,
        Andrea Arcangeli <aarcange@...hat.com>,
        "linux-mm@...ck.org" <linux-mm@...ck.org>,
        LKML <linux-kernel@...r.kernel.org>,
        Andrey Ryabinin <aryabinin@...tuozzo.com>
Subject: Re: mm: BUG in resv_map_release

On Thu, 23 Mar 2017 11:19:38 +0100 Dmitry Vyukov <dvyukov@...gle.com> wrote:

> Hello,
> 
> I've got the following BUG while running syzkaller fuzzer.
> Note the injected kmalloc failure, most likely it's the root cause.
> 

Yes, probably the logic(?) in region_chg() leaked a
resv->adds_in_progress++, although I'm not sure how.  And afaict that
code can leak the memory at *nrg if the `trg' allocation attempt failed
on the second or later pass around the retry loop.

Blah.  Does someone want to take a look at it?