Re: mm: BUG in resv_map_release

[Andrew Morton]

On Thu, 23 Mar 2017 11:19:38 +0100 Dmitry Vyukov <dvyukov@xxxxxxxxxx> 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?