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

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Message-Id: <5134741702000078000C2B3E@nat28.tlf.novell.com>
Date:	Mon, 04 Mar 2013 09:14:47 +0000
From:	"Jan Beulich" <JBeulich@...e.com>
To:	"Paul Bolle" <pebolle@...cali.nl>
Cc:	"Ian Campbell" <ian.campbell@...rix.com>,
	"Ben Hutchings" <ben@...adent.org.uk>,
	"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 04.03.13 at 10:11, Paul Bolle <pebolle@...cali.nl> wrote:
> 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/bl 
> ock/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?

I do, yes. But I'd suggest to get Konrad to agree.

Jan

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