linux-kernel - Re: [PATCH] rmap: anon_vma_prepare() can leak anon_vma

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Message-ID: <4BCE12CA.1070209@redhat.com>
Date:	Tue, 20 Apr 2010 16:47:06 -0400
From:	Rik van Riel <riel@...hat.com>
To:	Oleg Nesterov <oleg@...hat.com>
CC:	Andrew Morton <akpm@...ux-foundation.org>,
	Hugh Dickins <hugh.dickins@...cali.co.uk>,
	Pete Zaitcev <zaitcev@...hat.com>, linux-kernel@...r.kernel.org
Subject: Re: [PATCH] rmap: anon_vma_prepare() can leak anon_vma_chain

On 04/20/2010 03:24 PM, Oleg Nesterov wrote:
> If find_mergeable_anon_vma() succeeds but another thread installs
> ->anon_vma before we take ptl, then allocated == NULL but avc should
> be freed. Change the code to check avc != NULL to detect this case.

Good catch!

> Signed-off-by: Oleg Nesterov<oleg@...hat.com>

Reviewed-by: Rik van Riel <riel@...hat.com>
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