linux-kernel - Re: [PATCH] inetdevice: fixed signed integer overflow

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Message-Id: <20141114.170941.444338853371717833.davem@davemloft.net>
Date:	Fri, 14 Nov 2014 17:09:41 -0500 (EST)
From:	David Miller <davem@...emloft.net>
To:	vincent.benayoun@...st-in-soft.com
Cc:	jiri@...nulli.us, ja@....bg, nicolas.dichtel@...nd.com,
	linux-kernel@...r.kernel.org, netdev@...r.kernel.org
Subject: Re: [PATCH] inetdevice: fixed signed integer overflow

From: Vincent Benayoun <vincent.benayoun@...st-in-soft.com>
Date: Thu, 13 Nov 2014 15:04:57 +0000

> From f25ff0f2645f9763552147d480f86973b7041e26 Mon Sep 17 00:00:00 2001
> From: Vincent BENAYOUN <vincent.benayoun@...st-in-soft.com>
> Date: Thu, 13 Nov 2014 13:47:26 +0100
> Subject: [PATCH] inetdevice: fixed signed integer overflow
> 
> There could be a signed overflow in the following code.
> 
> The expression, (32-logmask) is comprised between 0 and 31 included.
> It may be equal to 31.
> In such a case the left shift will produce a signed integer overflow.
> According to the C99 Standard, this is an undefined behavior.
> A simple fix is to replace the signed int 1 with the unsigned int 1U.
> 
> Signed-off-by: Vincent BENAYOUN <vincent.benayoun@...st-in-soft.com>

Applied, thanks.
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