linux-kernel - Re: [PATCH V2] slub: avoid potential NULL dereference or corruption

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Message-ID: <alpine.DEB.2.00.1111222129420.21009@chino.kir.corp.google.com>
Date:	Tue, 22 Nov 2011 21:30:00 -0800 (PST)
From:	David Rientjes <rientjes@...gle.com>
To:	Eric Dumazet <eric.dumazet@...il.com>
cc:	Christoph Lameter <cl@...ux.com>,
	Pekka Enberg <penberg@...nel.org>,
	linux-kernel <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH V2] slub: avoid potential NULL dereference or
 corruption

On Tue, 22 Nov 2011, Eric Dumazet wrote:

> show_slab_objects() can trigger NULL dereferences or memory corruption.
> 
> Another cpu can change its c->page to NULL or c->node to NUMA_NO_NODE
> while we use them.
> 
> Use ACCESS_ONCE(c->page) and ACCESS_ONCE(c->node) to make sure this
> cannot happen.
> 
> Signed-off-by: Eric Dumazet <eric.dumazet@...il.com>
> 

Acked-by: David Rientjes <rientjes@...gle.com>
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