linux-kernel - Re: [PATCH] tmpfs: fix shared mempolicy leak

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Message-ID: <CA+ydwtoduPVnkzL4cgRdaNjhTYa1HV2KUi6CjXsap_qOuu_SQQ@mail.gmail.com>
Date:	Wed, 5 Dec 2012 22:25:53 +0200
From:	Tommi Rantala <tt.rantala@...il.com>
To:	Mel Gorman <mgorman@...e.de>
Cc:	Hugh Dickins <hughd@...gle.com>, Stable <stable@...r.kernel.org>,
	Andi Kleen <ak@...ux.intel.com>,
	Andrew Morton <akpm@...ux-foundation.org>,
	KOSAKI Motohiro <kosaki.motohiro@...fujitsu.com>,
	Dave Jones <davej@...hat.com>,
	Christoph Lameter <cl@...ux.com>,
	LKML <linux-kernel@...r.kernel.org>,
	Linux-MM <linux-mm@...ck.org>
Subject: Re: [PATCH] tmpfs: fix shared mempolicy leak

2012/12/5 Mel Gorman <mgorman@...e.de>:
> On Tue, Dec 04, 2012 at 11:24:30PM -0800, Hugh Dickins wrote:
>> From: Mel Gorman <mgorman@...e.de>
>>
>> Commit 00442ad04a5e ("mempolicy: fix a memory corruption by refcount
>> imbalance in alloc_pages_vma()") changed get_vma_policy() to raise the
>> refcount on a shmem shared mempolicy; whereas shmem_alloc_page() went
>> on expecting alloc_page_vma() to drop the refcount it had acquired.
>> This deserves a rework: but for now fix the leak in shmem_alloc_page().
>
> Thanks Hugh for turning gibber into a patch!
>
> Signed-off-by: Mel Gorman <mgorman@...e.de>
>
> Tommi, just in case, can you confirm this fixes the problem for you please?

Confirmed! No more complaints from kmemleak.

Thanks,
Tommi
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