linux-kernel - Re: [patch] slub: fix per cpu kmem_cache

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Message-Id: <1233132733.16201.0.camel@penberg-laptop>
Date:	Wed, 28 Jan 2009 10:52:12 +0200
From:	Pekka Enberg <penberg@...helsinki.fi>
To:	David Rientjes <rientjes@...gle.com>
Cc:	Christoph Lameter <cl@...ux-foundation.org>,
	linux-kernel@...r.kernel.org
Subject: Re: [patch] slub: fix per cpu kmem_cache_cpu array memory leak

On Tue, 2009-01-27 at 18:59 -0800, David Rientjes wrote:
> The per cpu array of kmem_cache_cpu structures accomodates
> NR_KMEM_CACHE_CPU such structs.
> 
> When this array overflows and a struct is allocated by kmalloc(), it may
> have an address at the upper bound of this array.  If this happens, it
> does not get freed and the per cpu kmem_cache_cpu_free pointer will be out
> of bounds after kmem_cache_destroy() or cpu offlining.
> 
> Cc: Christoph Lameter <cl@...ux-foundation.org>
> Signed-off-by: David Rientjes <rientjes@...gle.com>

Applied, thanks!

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