linux-kernel - Re: [PATCH 3.2.y 3.3.y] staging:rts_pstor:Fix possible panic by NULL pointer dereference

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Date:	Fri, 22 Jun 2012 04:53:29 +0100
From:	Ben Hutchings <ben@...adent.org.uk>
To:	Keng-Yu Lin <kengyu@...onical.com>
Cc:	stable@...r.kernel.org,
	Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
	wwang <wei_wang@...lsil.com.cn>,
	Hitoshi NAKAMORI <hitoshi.nakamori@...il.com>,
	devel@...verdev.osuosl.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH 3.2.y 3.3.y] staging:rts_pstor:Fix possible panic by
 NULL pointer dereference

On Thu, 2012-06-21 at 16:18 +0800, Keng-Yu Lin wrote:
> From: wwang <wei_wang@...lsil.com.cn>
> 
> commit 0d05568ac79bfc595f1eadc3e0fd7a20a45f7b69 upstream.
> 
> rtsx_transport.c (rtsx_transfer_sglist_adma_partial):
> pointer struct scatterlist *sg, which is mapped in dma_map_sg,
> is used as an iterator in later transfer operation. It is corrupted and
> passed to dma_unmap_sg, thus causing fatal unmap of some erroneous address.
> Fix it by duplicating *sg_ptr for iterating.
[...]

Added to the queue for 3.2, thanks.

Ben.

-- 
Ben Hutchings
Every program is either trivial or else contains at least one bug

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