linux-kernel - Re: [PATCH 01/16] eicon: fix -Warray-bounds warning

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Date:	Thu, 2 Feb 2012 19:25:15 +0100
From:	Karsten Keil <kkeil@...ux-pingi.de>
To:	Danny Kukawka <danny.kukawka@...ect.de>
Cc:	David Laight <David.Laight@...lab.com>,
	Karsten Keil <kkeil@...ux-pingi.de>,
	Ben Hutchings <bhutchings@...arflare.com>,
	Armin Schindler <mac@...ware.de>, linux-kernel@...r.kernel.org,
	netdev@...r.kernel.org, Karsten Keil <isdn@...ux-pingi.de>
Subject: Re: [PATCH 01/16] eicon: fix -Warray-bounds warning

On Wed, Feb 01, 2012 at 01:52:18PM +0100, Danny Kukawka wrote:
> On Mittwoch, 1. Februar 2012, David Laight wrote:
> > > -----Original Message-----
> > > From: netdev-owner@...r.kernel.org
> > > [mailto:netdev-owner@...r.kernel.org] On Behalf Of Danny Kukawka
> > > Sent: 31 January 2012 17:04
> > > To: Karsten Keil
> > > Cc: Ben Hutchings; Armin Schindler;
> > > linux-kernel@...r.kernel.org; netdev@...r.kernel.org; Karsten Keil
> > > Subject: Re: [PATCH 01/16] eicon: fix -Warray-bounds warning
> > >
> > > On Dienstag, 31. Januar 2012, Karsten Keil wrote:
> > > > On Mon, Jan 30, 2012 at 11:09:32PM +0000, Ben Hutchings wrote:
> > > > > On Mon, 2012-01-30 at 23:00 +0100, Danny Kukawka wrote:
> > > > > > Fix for a -Warray-bounds warning. mixer_notify_update() tries to
> > > > > > write to ((CAPI_MSG *) msg)->info.facility_req.structs[3] while
> > > > > > structs is defined as byte structs[1], define structs[1] as
> > > > > > structs[4].
> > > > >
> > > > > I suspect that all the 'byte structs[1];' fields defined
> > >
> > > in that header
> > >
> > > > > are actually variable-length arrays.  In that case, there
> > >
> > > may be no
> > >
> > > > > reasonable bound you can specify.
> > > >
> > > > Yes, exactely, the structs is a ASN1 coded message so it
> > >
> > > can have any len.
> > >
> > > So, how can we get rid of the compiler warning then?
> >
> > Try defining it as a 'variable sized array' - byte structs[0].
> 
> Okay, that works. I'll send an updated patch.
> 

Nice, I did not know this way.

Karsten
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