linux-kernel - Re: [PATCH] iwlwifi: out-of-bounds access in iwl_init_sband

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Message-ID: <20150814090408.1521e8fe.adrien+dev@schischi.me>
Date:	Fri, 14 Aug 2015 09:04:08 +0200
From:	Adrien Schildknecht <adrien+dev@...ischi.me>
To:	"Grumbach, Emmanuel" <emmanuel.grumbach@...el.com>
Cc:	"Berg, Johannes" <johannes.berg@...el.com>,
	"ilw@...ux.intel.com" <ilw@...ux.intel.com>,
	"kvalo@...eaurora.org" <kvalo@...eaurora.org>,
	"linux-wireless@...r.kernel.org" <linux-wireless@...r.kernel.org>,
	"netdev@...r.kernel.org" <netdev@...r.kernel.org>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH] iwlwifi: out-of-bounds access in
 iwl_init_sband_channels

Hi,

> On 08/14/2015 03:36 AM, Adrien Schildknecht wrote:
> > Both loops of this function compare data from the 'chan' array and
> > then check if the index is valid.
> > 
> > The 2 conditions should be inverted to avoid an out-of-bounds
> > access.
> > 
> 
> Was that found by a static analyzer or any other automated tool, or
> was that the result of your very careful review?

The error has been reported by KASan:
==================================================================
BUG: KASan: out of bounds access in iwl_init_sband_channels+0x207/0x260 [iwlwifi] at addr ffff8800c2d0aac8
Read of size 4 by task modprobe/329
==================================================================

-- 
Adrien Schildknecht
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