linux-kernel - Re: [PATCH v6] scatterlist: prevent invalid free when alloc fails

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Date:	Mon, 30 Aug 2010 19:28:16 +0200
From:	Tejun Heo <tj@...nel.org>
To:	Jeffrey Carlyle <jeff.carlyle@...orola.com>
CC:	OLUSANYA SOYANNWO <olusanya.soyannwo@...orola.com>,
	linux-kernel@...r.kernel.org, Hu Tao <taohu@...orola.com>,
	jaxboe@...ionio.com, torvalds@...l.org
Subject: Re: [PATCH v6] scatterlist: prevent invalid free when alloc fails

On 08/30/2010 06:19 PM, Jeffrey Carlyle wrote:
> When alloc fails, free_table is being called. Depending on the number of
> bytes requested, we determine if we are going to call _get_free_page()
> or kmalloc(). When alloc fails, our math is wrong (due to sg_size - 1),
> and the last buffer is wrongfully assumed to have been allocated by
> kmalloc. Hence, kfree gets called and a panic occurs.
> 
> Signed-off-by: Jeffrey Carlyle <jeff.carlyle@...orola.com>
> Signed-off-by: Olusanya Soyannwo <c23746@...orola.com>
> Cc: Tejun Heo <tj@...nel.org>
> Cc: Jens Axboe <jaxboe@...ionio.com>

Acked-by: Tejun Heo <tj@...nel.org>

Thanks. :-)

-- 
tejun
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