netdev - Re: [patch 2/3] i4l: silence compiler warnings for array access in Eicon DIVA ISDN driver

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Message-Id: <20100315.154842.00466136.davem@davemloft.net>
Date:	Mon, 15 Mar 2010 15:48:42 -0700 (PDT)
From:	David Miller <davem@...emloft.net>
To:	akpm@...ux-foundation.org
Cc:	isdn@...ux-pingi.de, netdev@...r.kernel.org, imunsie@...ibm.com,
	mac@...ware.de, sgayda2@...c.edu
Subject: Re: [patch 2/3] i4l: silence compiler warnings for array access in
 Eicon DIVA ISDN driver

From: akpm@...ux-foundation.org
Date: Thu, 11 Mar 2010 14:07:24 -0800

> From: Ian Munsie <imunsie@...ibm.com>
> 
> When compiling this driver, the compiler throws the following warnings:
> 
> drivers/isdn/hardware/eicon/message.c:8426: warning: array subscript is above array bounds
> drivers/isdn/hardware/eicon/message.c:8427: warning: array subscript is above array bounds
> drivers/isdn/hardware/eicon/message.c:8434: warning: array subscript is above array bounds
> drivers/isdn/hardware/eicon/message.c:8435: warning: array subscript is above array bounds
> drivers/isdn/hardware/eicon/message.c:8436: warning: array subscript is above array bounds
> drivers/isdn/hardware/eicon/message.c:8447: warning: array subscript is above array bounds
> 
> This arises from the particular semantics the driver is using to write to
> the nlc array (static byte[256]).  The array has a length in byte 0
> followed by a T30_INFO struct starting at byte 1.
> 
> The T30_INFO struct has a number of variable length strings after the
> station_id entry, which cannot be explicitly defined in the struct and the
> driver accesses them with an array index to station_id beyond the length
> of station_id.
> 
> This patch merely changes the semantics that the driver uses to access the
> entries after the station_id entry to use the original 256 byte nlc array
> taking the offset and length of the station_id entry to calculate where to
> write in the array, thereby silencing the warning.
> 
> Signed-off-by: Ian Munsie <imunsie@...ibm.com>
> Cc: Armin Schindler <mac@...ware.de>
> Cc: Karsten Keil <isdn@...ux-pingi.de>
> Cc: Stoyan Gaydarov <sgayda2@...c.edu>
> Signed-off-by: Andrew Morton <akpm@...ux-foundation.org>

Applied.
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