linux-kernel - Re: [PATCH] slub: fix a memory leak in get_partial

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Message-ID: <alpine.DEB.2.00.1205151527150.11923@router.home>
Date:	Tue, 15 May 2012 15:36:52 -0500 (CDT)
From:	Christoph Lameter <cl@...ux.com>
To:	Joonsoo Kim <js1304@...il.com>
cc:	Pekka Enberg <penberg@...nel.org>, linux-kernel@...r.kernel.org,
	linux-mm@...ck.org,
	Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
	stable@...r.kernel.org
Subject: Re: [PATCH] slub: fix a memory leak in get_partial_node()

On Wed, 16 May 2012, Joonsoo Kim wrote:

> In the case which is below,
>
> 1. acquire slab for cpu partial list
> 2. free object to it by remote cpu
> 3. page->freelist = t
>
> then memory leak is occurred.

Hmmm... Ok so we cannot assign page->freelist in get_partial_node() for
the cpu partial slabs. It must be done in the cmpxchg transition.

Acked-by: Christoph Lameter <cl@...ux.com>
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