linux-kernel - Re: [ 34/77] xen/blkback: Dont trust the handle from the frontend.

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Date:	Mon, 04 Mar 2013 10:11:42 +0100
From:	Paul Bolle <pebolle@...cali.nl>
To:	Jan Beulich <JBeulich@...e.com>
Cc:	Ben Hutchings <ben@...adent.org.uk>,
	Ian Campbell <ian.campbell@...rix.com>,
	Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
	KonradRzeszutek Wilk <konrad.wilk@...cle.com>,
	linux-kernel@...r.kernel.org, stable@...r.kernel.org
Subject: Re: [ 34/77] xen/blkback: Dont trust the handle from the frontend.

On Mon, 2013-03-04 at 07:55 +0000, Jan Beulich wrote:
> >>> On 03.03.13 at 11:20, Paul Bolle <pebolle@...cali.nl> wrote:
> For one, a fix for the (indeed valid) compiler warning has been in
> Konrad's tree for several days
> (http://git.kernel.org/cgit/linux/kernel/git/konrad/xen.git/commit/drivers/block/xen-blkback/blkback.c?id=a72d9002f80bffd7e4c7d60e5a9caa0cddffe894).

Thanks. (For the record: that commit is titled "xen/xen-blkback:
preq.dev is used without initialized".)

> And second, there's nothing really being fixed with the patch in
> question here. The title is kind of misleading, as the handle
> coming from the frontend is - without said patch - in the worst
> case being used for the very message that triggered the
> compiler warning. Nothing else is affected, the code just gave
> the impression that the handle was used.
> 
> IOW I don't see why this got proposed for stable at all.

So, you suggest to just drop this patch for v3.8.3, don't you?


Paul Bolle

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