linux-kernel - Re: [PATCH 6/7] iio: adc: stm32-dfsdm: add check on max filter id

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Date:   Sat, 28 Apr 2018 16:07:06 +0100
From:   Jonathan Cameron <jic23@...nel.org>
To:     Fabrice Gasnier <fabrice.gasnier@...com>
Cc:     <linux-arm-kernel@...ts.infradead.org>,
        <linux-kernel@...r.kernel.org>, <mcoquelin.stm32@...il.com>,
        <alexandre.torgue@...com>, <linux-iio@...r.kernel.org>,
        <lars@...afoo.de>, <knaack.h@....de>, <pmeerw@...erw.net>,
        <benjamin.gaignard@...aro.org>, <arnaud.pouliquen@...com>
Subject: Re: [PATCH 6/7] iio: adc: stm32-dfsdm: add check on max filter id

On Fri, 23 Feb 2018 13:51:00 +0100
Fabrice Gasnier <fabrice.gasnier@...com> wrote:

> reg property should be checked against number of available filters.
> BTW, dfsdm->num_fls wasn't used. But it can be used for this purpose.
> This prevents using data out of allocated dfsdm->fl_list array.
> 
> Signed-off-by: Fabrice Gasnier <fabrice.gasnier@...com>
Applied to the togreg branch of iio.git and pushed out as testing for
the autobuilders to play with it.

Thanks,

Jonathan

> ---
>  drivers/iio/adc/stm32-dfsdm-adc.c | 4 ++--
>  1 file changed, 2 insertions(+), 2 deletions(-)
> 
> diff --git a/drivers/iio/adc/stm32-dfsdm-adc.c b/drivers/iio/adc/stm32-dfsdm-adc.c
> index 57bcb45..1b78bec 100644
> --- a/drivers/iio/adc/stm32-dfsdm-adc.c
> +++ b/drivers/iio/adc/stm32-dfsdm-adc.c
> @@ -1111,8 +1111,8 @@ static int stm32_dfsdm_adc_probe(struct platform_device *pdev)
>  	platform_set_drvdata(pdev, adc);
>  
>  	ret = of_property_read_u32(dev->of_node, "reg", &adc->fl_id);
> -	if (ret != 0) {
> -		dev_err(dev, "Missing reg property\n");
> +	if (ret != 0 || adc->fl_id >= adc->dfsdm->num_fls) {
> +		dev_err(dev, "Missing or bad reg property\n");
>  		return -EINVAL;
>  	}
>