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

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Message-ID: <1327964972.2595.31.camel@bwh-desktop>
Date:	Mon, 30 Jan 2012 23:09:32 +0000
From:	Ben Hutchings <bhutchings@...arflare.com>
To:	Danny Kukawka <danny.kukawka@...ect.de>
CC:	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 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.

Ben.

> Signed-off-by: Danny Kukawka <danny.kukawka@...ect.de>
> ---
>  drivers/isdn/hardware/eicon/capi20.h |    2 +-
>  1 files changed, 1 insertions(+), 1 deletions(-)
> 
> diff --git a/drivers/isdn/hardware/eicon/capi20.h b/drivers/isdn/hardware/eicon/capi20.h
> index 7ebcccd..f9170ad 100644
> --- a/drivers/isdn/hardware/eicon/capi20.h
> +++ b/drivers/isdn/hardware/eicon/capi20.h
> @@ -226,7 +226,7 @@ typedef struct {
>          /* FACILITY-REQUEST */
>  typedef struct {
>    word Selector;
> -  byte structs[1];      /* Facility parameters */
> +  byte structs[4];      /* Facility parameters */
>  } _FAC_REQP;
>          /* FACILITY-CONFIRM STRUCT FOR SUPPLEMENT. SERVICES */
>  typedef struct {

-- 
Ben Hutchings, Staff Engineer, Solarflare
Not speaking for my employer; that's the marketing department's job.
They asked us to note that Solarflare product names are trademarked.

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