linux-kernel - Re: [PATCH] iio: dac: fix off-by-one comparison and out-of-bounds write

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Date:	Thu, 2 Jun 2016 12:53:44 +0200
From:	Michael Hennerich <michael.hennerich@...log.com>
To:	Colin King <colin.king@...onical.com>,
	Lars-Peter Clausen <lars@...afoo.de>,
	Jonathan Cameron <jic23@...nel.org>,
	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: dac: fix off-by-one comparison and out-of-bounds
 write

On 06/02/2016 12:06 PM, Colin King wrote:
> From: Colin Ian King <colin.king@...onical.com>
>
> The check on reg is off-by-one, it should be >= rather than >. Fix
> this to stop an out-of-bounds write to st->channel_modes[reg].
>
> Signed-off-by: Colin Ian King <colin.king@...onical.com>

Acked-by: Michael Hennerich <michael.hennerich@...log.com>

> ---
>   drivers/iio/dac/ad5592r-base.c | 2 +-
>   1 file changed, 1 insertion(+), 1 deletion(-)
>
> diff --git a/drivers/iio/dac/ad5592r-base.c b/drivers/iio/dac/ad5592r-base.c
> index 948f600..69bde59 100644
> --- a/drivers/iio/dac/ad5592r-base.c
> +++ b/drivers/iio/dac/ad5592r-base.c
> @@ -525,7 +525,7 @@ static int ad5592r_alloc_channels(struct ad5592r_state *st)
>
>   	device_for_each_child_node(st->dev, child) {
>   		ret = fwnode_property_read_u32(child, "reg", &reg);
> -		if (ret || reg > ARRAY_SIZE(st->channel_modes))
> +		if (ret || reg >= ARRAY_SIZE(st->channel_modes))
>   			continue;
>
>   		ret = fwnode_property_read_u32(child, "adi,mode", &tmp);
>


-- 
Greetings,
Michael

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