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

[Michael Hennerich]

On 06/02/2016 12:06 PM, Colin King wrote:
> From: Colin Ian King <colin.king@xxxxxxxxxxxxx>
>
> 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@xxxxxxxxxxxxx>

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

> ---
>   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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