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

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Date:	Tue, 12 Mar 2013 15:10:30 -0700
From:	Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:	Konrad Rzeszutek Wilk <konrad.wilk@...cle.com>
Cc:	Jan Beulich <JBeulich@...e.com>, Paul Bolle <pebolle@...cali.nl>,
	Ian Campbell <ian.campbell@...rix.com>,
	Ben Hutchings <ben@...adent.org.uk>,
	linux-kernel@...r.kernel.org, stable@...r.kernel.org
Subject: Re: [ 34/77] xen/blkback: Dont trust the handle from the frontend.

On Mon, Mar 04, 2013 at 10:02:46AM -0500, Konrad Rzeszutek Wilk wrote:
> On Mon, Mar 04, 2013 at 09:14:47AM +0000, Jan Beulich wrote:
> > >>> 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.
> 
> Which it actually is not, unless somebody compiles the kernel
> with #define DEBUG 1
> at the top of the file.
> 
> > >> 
> > >> 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.
> 
> Yes. Lets drop it.

Now reverted, thanks.

greg k-h
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