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

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Date:	Fri, 14 Aug 2015 10:14:23 +0300
From:	Kalle Valo <kvalo@...eaurora.org>
To:	Adrien Schildknecht <adrien+dev@...ischi.me>
Cc:	"Grumbach\, Emmanuel" <emmanuel.grumbach@...el.com>,
	"Berg\, Johannes" <johannes.berg@...el.com>,
	"ilw\@linux.intel.com" <ilw@...ux.intel.com>,
	"linux-wireless\@vger.kernel.org" <linux-wireless@...r.kernel.org>,
	"netdev\@vger.kernel.org" <netdev@...r.kernel.org>,
	"linux-kernel\@vger.kernel.org" <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH] iwlwifi: out-of-bounds access in iwl_init_sband_channels

Adrien Schildknecht <adrien+dev@...ischi.me> writes:

> 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
> ==================================================================

Always try to add information like this to the commit log, it's very
useful.

-- 
Kalle Valo
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