linux-kernel - Re: [PATCH 07/11] iio: light: bh1745: fix information leak in triggered buffer

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Message-ID: <20241130205355.0c4238c7@jic23-huawei>
Date: Sat, 30 Nov 2024 20:53:55 +0000
From: Jonathan Cameron <jic23@...nel.org>
To: Javier Carrasco <javier.carrasco.cruz@...il.com>
Cc: Lars-Peter Clausen <lars@...afoo.de>, Antoni Pokusinski
 <apokusinski01@...il.com>, Francesco Dolcini <francesco@...cini.it>,
 João Paulo Gonçalves
 <jpaulo.silvagoncalves@...il.com>, Gregor Boirie
 <gregor.boirie@...rot.com>, Jonathan Cameron <Jonathan.Cameron@...wei.com>,
 linux-iio@...r.kernel.org, linux-kernel@...r.kernel.org, João Paulo Gonçalves
 <joao.goncalves@...adex.com>, Francesco Dolcini
 <francesco.dolcini@...adex.com>, stable@...r.kernel.org
Subject: Re: [PATCH 07/11] iio: light: bh1745: fix information leak in
 triggered buffer

On Mon, 25 Nov 2024 22:16:15 +0100
Javier Carrasco <javier.carrasco.cruz@...il.com> wrote:

> The 'scan' local struct is used to push data to user space from a
> triggered buffer, but it does not set values for inactive channels, as
> it only uses iio_for_each_active_channel() to assign new values.
> 
> Initialize the struct to zero before using it to avoid pushing
> uninitialized information to userspace.
> 
> Cc: stable@...r.kernel.org
> Fixes: eab35358aae7 ("iio: light: ROHM BH1745 colour sensor")
> Signed-off-by: Javier Carrasco <javier.carrasco.cruz@...il.com>
Applied.
> ---
>  drivers/iio/light/bh1745.c | 2 ++
>  1 file changed, 2 insertions(+)
> 
> diff --git a/drivers/iio/light/bh1745.c b/drivers/iio/light/bh1745.c
> index 23e9f16090cc..2ffc839c7501 100644
> --- a/drivers/iio/light/bh1745.c
> +++ b/drivers/iio/light/bh1745.c
> @@ -746,6 +746,8 @@ static irqreturn_t bh1745_trigger_handler(int interrupt, void *p)
>  	int i;
>  	int j = 0;
>  
> +	memset(&scan, 0, sizeof(scan));
> +
>  	iio_for_each_active_channel(indio_dev, i) {
>  		ret = regmap_bulk_read(data->regmap, BH1745_RED_LSB + 2 * i,
>  				       &value, 2);
>