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

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Message-Id: <5134617F02000078000C2AD8@nat28.tlf.novell.com>
Date:	Mon, 04 Mar 2013 07:55:27 +0000
From:	"Jan Beulich" <JBeulich@...e.com>
To:	"Ben Hutchings" <ben@...adent.org.uk>,
	"Paul Bolle" <pebolle@...cali.nl>
Cc:	"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 03.03.13 at 11:20, Paul Bolle <pebolle@...cali.nl> wrote:
> Perhaps Konrad, Jan, Or Ian can tell whether the patch still needs to go
> in stable as is, because the problem it fixes is more severe than the
> problem it apparently creates. Maybe a mainline fix is needed before
> this can go in, or perhaps even a stable specific fix (if context
> changes are to blame).

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).

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.

Jan

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