linux-kernel - Re: [patch] iio: dac: ad5592r: Off by one bug in ad5592r_alloc

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Date:	Sun, 1 May 2016 20:04:32 +0100
From:	Jonathan Cameron <jic23@...nel.org>
To:	Dan Carpenter <dan.carpenter@...cle.com>,
	Lars-Peter Clausen <lars@...afoo.de>
Cc:	Michael Hennerich <Michael.Hennerich@...log.com>,
	Hartmut Knaack <knaack.h@....de>,
	Peter Meerwald-Stadler <pmeerw@...erw.net>,
	linux-iio@...r.kernel.org, linux-kernel@...r.kernel.org,
	kernel-janitors@...r.kernel.org
Subject: Re: [patch] iio: dac: ad5592r: Off by one bug in
 ad5592r_alloc_channels()

On 29/04/16 10:03, Dan Carpenter wrote:
> The > here should be >= or we go beyond the end for the array.
> 
> Signed-off-by: Dan Carpenter <dan.carpenter@...cle.com>
Good spot - marked it to pick up when I am back on the internet soonish....
(though perhaps not when I my computer manages to sneak this lot out!)
> 
> 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);
> --
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