linux-kernel - Re: [PATCH] iio: ad5755: fix off-by-one on devnr limit check

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Date:   Sun, 21 Aug 2016 22:07:33 +0200
From:   Lars-Peter Clausen <lars@...afoo.de>
To:     Jonathan Cameron <jic23@...nel.org>,
        Colin King <colin.king@...onical.com>,
        Michael Hennerich <Michael.Hennerich@...log.com>,
        Hartmut Knaack <knaack.h@....de>,
        Peter Meerwald-Stadler <pmeerw@...erw.net>,
        linux-iio@...r.kernel.org
Cc:     linux-kernel@...r.kernel.org
Subject: Re: [PATCH] iio: ad5755: fix off-by-one on devnr limit check

On 08/21/2016 09:30 PM, Jonathan Cameron wrote:
> On 25/07/16 23:40, Colin King wrote:
>> From: Colin Ian King <colin.king@...onical.com>
>>
>> The comparison for devnr limits is off-by-one, the current check
>> allows 0 to AD5755_NUM_CHANNELS and the limit should be in fact
>> 0 to AD5755_NUM_CHANNELS - 1.  This can lead to an out of bounds
>> write to pdata->dac[devnr]. Fix this by replacing > with >= on the
>> comparison.
>>
>> Signed-off-by: Colin Ian King <colin.king@...onical.com>
> Lars? 
> 
> Looks correct to me.
> 
> I'd also like a fixes tag for this if possible.  Guessing it
> might well be the original driver introduction but best to be
> sure ;)

It's new in 4.8-rc1. It was introduced by the devictree support patch.

Fixes: c947459979c6 ("iio: ad5755: add support for dt bindings")