linux-kernel - Re: [PATCH] - Updated: Fix slab corruption caused by alloc_cpumask_var

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Date:	Fri, 3 Apr 2009 00:23:59 +0200
From:	Ingo Molnar <mingo@...e.hu>
To:	Jack Steiner <steiner@....com>
Cc:	Andrew Morton <akpm@...ux-foundation.org>, rusty@...tcorp.com.au,
	sfr@...b.auug.org.au, linux-kernel@...r.kernel.org,
	stable@...nel.org
Subject: Re: [PATCH] - Updated: Fix slab corruption caused by
	alloc_cpumask_var_node()


* Jack Steiner <steiner@....com> wrote:

> Fix slab corruption caused by alloc_cpumask_var_node() overwriting
> the tail end of an off-stack cpumask.
> 
> The function zeros out cpumask bits beyond the last possible cpu.
> The starting point for zeroing should be the beginning
> of the mask offset by a byte count derived from the number
> of possible cpus. The offset was calculated in bits instead of bytes.
> This resulted in overwriting the end of the cpumask.
> 
> 
> v2.6.29 is also affected by this bug.
> 
> 
> Signed-off-by: Jack Steiner <steiner@....com>
> Acked-by: Mike Travis <travis.sgi.com>
> Acked-by: Ingo Molnar <mingo@...e.hu>

In the future you can add:

  Cc: <stable@...nel.org>

to the signoff/ack section of the changlog in such cases - then the 
-stable folks will notice the commit automatically.

Thanks,

	Ingo
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