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

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Message-ID: <AE90C24D6B3A694183C094C60CF0A2F6026B6E45@saturn3.aculab.com>
Date:	Wed, 1 Feb 2012 09:04:48 -0000
From:	"David Laight" <David.Laight@...LAB.COM>
To:	"Danny Kukawka" <danny.kukawka@...ect.de>,
	"Karsten Keil" <kkeil@...ux-pingi.de>
Cc:	"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

 

> -----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].

	David


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