linux-kernel - Re: [PATCH v1] iio: adc: PAC1934: fix accessing out of bounds array index

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Message-ID: <20240425-canteen-alias-5a907b1deecc@wendy>
Date: Thu, 25 Apr 2024 13:22:45 +0100
From: Conor Dooley <conor.dooley@...rochip.com>
To: <marius.cristea@...rochip.com>
CC: <jic23@...nel.org>, <lars@...afoo.de>, <lgirdwood@...il.com>,
	<broonie@...nel.org>, <linux-iio@...r.kernel.org>,
	<linux-kernel@...r.kernel.org>, <conor+dt@...nel.org>
Subject: Re: [PATCH v1] iio: adc: PAC1934: fix accessing out of bounds array
 index

On Thu, Apr 25, 2024 at 02:42:32PM +0300, marius.cristea@...rochip.com wrote:
> From: Marius Cristea <marius.cristea@...rochip.com>
> 
> Fix accessing out of bounds array index for average
> current and voltage measurements. The device itself has
> only 4 channels, but in sysfs there are "fake"
> channels for the average voltages and currents too.
> 
> Fixes: 0fb528c8255b: "iio: adc: adding support for PAC193x"
> Reported-by: Conor Dooley <conor.dooley@...rochip.com>
> Signed-off-by: Marius Cristea <marius.cristea@...rochip.com>
> ---
>  drivers/iio/adc/pac1934.c | 9 +++++++++
>  1 file changed, 9 insertions(+)
> 
> diff --git a/drivers/iio/adc/pac1934.c b/drivers/iio/adc/pac1934.c
> index f751260605e4..456f12faa348 100644
> --- a/drivers/iio/adc/pac1934.c
> +++ b/drivers/iio/adc/pac1934.c
> @@ -787,6 +787,15 @@ static int pac1934_read_raw(struct iio_dev *indio_dev,
>  	s64 curr_energy;
>  	int ret, channel = chan->channel - 1;
>  
> +	/*
> +	 * For AVG the index should be between 5 to 8.
> +	 * To calculate PAC1934_CH_VOLTAGE_AVERAGE,
> +	 * respectively PAC1934_CH_CURRENT real index, we need
> +	 * to remove the added offset (PAC1934_MAX_NUM_CHANNELS).
> +	 */
> +	if (channel >= PAC1934_MAX_NUM_CHANNELS)
> +		channel = channel - PAC1934_MAX_NUM_CHANNELS;
> +
>  	ret = pac1934_retrieve_data(info, PAC1934_MIN_UPDATE_WAIT_TIME_US);
>  	if (ret < 0)
>  		return ret;
> 
> base-commit: b80ad8e3cd2712b78b98804d1f59199680d8ed91
> -- 
> 2.34.1
> 

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