linux-kernel - Re: [PATCH v4 1/2] block: Fix a buffer overrun in bio_integrity

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Message-ID: <20121019203015.GS13370@google.com>
Date:	Fri, 19 Oct 2012 13:30:15 -0700
From:	Tejun Heo <tj@...nel.org>
To:	Kent Overstreet <koverstreet@...gle.com>
Cc:	linux-bcache@...r.kernel.org, linux-kernel@...r.kernel.org,
	dm-devel@...hat.com, axboe@...nel.dk, vgoyal@...hat.com,
	martin.petersen@...cle.com
Subject: Re: [PATCH v4 1/2] block: Fix a buffer overrun in
 bio_integrity_split()

On Mon, Oct 15, 2012 at 01:09:01PM -0700, Kent Overstreet wrote:
> bio_integrity_split() seemed to be confusing pointers and arrays -
> bip_vec in bio_integrity_payload was an array appended to the end of the
> payload, so the bio_vecs in struct bio_pair should have come after the
> bio_integrity_payload they're for.
> 
> Fix it by making bip_vec a pointer to the inline vecs - a later patch is
> going to make more use of this pointer.
> 
> Signed-off-by: Kent Overstreet <koverstreet@...gle.com>
> CC: Jens Axboe <axboe@...nel.dk>
> CC: Martin K. Petersen <martin.petersen@...cle.com>

This being an apparent bug, I think it would be better to create a
patch to simply reorder bio_pair fields to fix it and mark it w/ Cc:
stable and introduce bip_vec pointer separately.

Other than that, looks good.

Thanks.

-- 
tejun
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