linux-kernel - Re: [Stable-review] [24/28] USB: xhci

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Date:	Wed, 20 Apr 2011 13:34:35 +0100
From:	Ben Hutchings <ben@...adent.org.uk>
To:	Willy Tarreau <w@....eu>
Cc:	Dmitry Torokhov <dtor@...are.com>,
	Sarah Sharp <sarah.a.sharp@...ux.intel.com>,
	Greg KH <gregkh@...e.de>, linux-kernel@...r.kernel.org,
	stable@...nel.org, akpm@...ux-foundation.org,
	torvalds@...ux-foundation.org, stable-review@...nel.org,
	alan@...rguk.ukuu.org.uk
Subject: Re: [Stable-review] [24/28] USB: xhci - fix unsafe macro
 definitions

On Wed, 2011-04-20 at 07:39 +0200, Willy Tarreau wrote:
> On Wed, Apr 20, 2011 at 03:02:04AM +0100, Ben Hutchings wrote:
> > On Tue, 2011-04-19 at 13:31 -0700, Greg KH wrote:
> > > 2.6.32-longterm review patch.  If anyone has any objections, please let us know.
> > > 
> > > ------------------
> > > 
> > > From: Dmitry Torokhov <dtor@...are.com>
> > > 
> > > commit 5a6c2f3ff039154872ce597952f8b8900ea0d732 upstream.
> > > 
> > > Macro arguments used in expressions need to be enclosed in parenthesis
> > > to avoid unpleasant surprises.
> > 
> > Do you know of any specific uses of these macros where the missing
> > parentheses caused 'unpleasant surprises'?
> 
> In my opinion, this type of fix should be backported even if the current
> code does not appear to be at risk, otherwise a later fix in the kernel
> could cause a serious regression when backported to -stable. For instance,
> if we later have to backport this patch (cut'n'pasted) :
[...]

I agree, but would like to know whether there is an immediate effect.

Ben.

-- 
Ben Hutchings
Once a job is fouled up, anything done to improve it makes it worse.

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