linux-kernel - Re: [PATCH 1/3] iio: mxs-lradc: fix buffer overflow

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Date:	Sat, 18 Jan 2014 11:31:21 +0000
From:	Jonathan Cameron <jic23@...nel.org>
To:	Alexandre Belloni <alexandre.belloni@...e-electrons.com>
CC:	Marek Vasut <marex@...x.de>, linux-iio@...r.kernel.org,
	linux-kernel@...r.kernel.org
Subject: Re: [PATCH 1/3] iio: mxs-lradc: fix buffer overflow

On 13/01/14 16:02, Alexandre Belloni wrote:
> Fixes:
> drivers/staging/iio/adc/mxs-lradc.c:1556 mxs_lradc_probe() error: buffer
> overflow 'iio->channels' 15 <= 15
>
> The reported available scales for in_voltage15 were also wrong.
>
> The realbits lookup is not necessary as all the channels of the LRADC have the
> same resolution, use LRADC_RESOLUTION instead.
>
> Reported-by: Dan Carpenter <dan.carpenter@...cle.com>
> Signed-off-by: Alexandre Belloni <alexandre.belloni@...e-electrons.com>
Applied to the fixes-for-3.14new branch of iio.git.  This will go upstream
after 3.14-rc1 is tagged.

It's a little clunky having a simple array some of which isn't used for these
but I guess it does give fairly simple code.

Thanks,
> ---
>   drivers/staging/iio/adc/mxs-lradc.c | 2 +-
>   1 file changed, 1 insertion(+), 1 deletion(-)
>
> diff --git a/drivers/staging/iio/adc/mxs-lradc.c b/drivers/staging/iio/adc/mxs-lradc.c
> index df71669bb60e..aa86849daeba 100644
> --- a/drivers/staging/iio/adc/mxs-lradc.c
> +++ b/drivers/staging/iio/adc/mxs-lradc.c
> @@ -1613,7 +1613,7 @@ static int mxs_lradc_probe(struct platform_device *pdev)
>   			 * of the array.
>   			 */
>   			scale_uv = ((u64)lradc->vref_mv[i] * 100000000) >>
> -				   (iio->channels[i].scan_type.realbits - s);
> +				   (LRADC_RESOLUTION - s);
>   			lradc->scale_avail[i][s].nano =
>   					do_div(scale_uv, 100000000) * 10;
>   			lradc->scale_avail[i][s].integer = scale_uv;
>
--
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