linux-kernel - Re: [PATCH 03/11] iio: pressure: zpa2326: fix information leak in triggered buffer

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Message-ID: <20241130205948.389689b1@jic23-huawei>
Date: Sat, 30 Nov 2024 20:59:57 +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 03/11] iio: pressure: zpa2326: fix information leak in
 triggered buffer

On Mon, 25 Nov 2024 22:16:11 +0100
Javier Carrasco <javier.carrasco.cruz@...il.com> wrote:

> The 'sample' local struct is used to push data to user space from a
> triggered buffer, but it has a hole between the temperature and the
> timestamp (u32 pressure, u16 temperature, GAP, u64 timestamp).
> This hole is never initialized.
> 
> Initialize the struct to zero before using it to avoid pushing
> uninitialized information to userspace.
> 
> Cc: stable@...r.kernel.org
> Fixes: 03b262f2bbf4 ("iio:pressure: initial zpa2326 barometer support")
> Signed-off-by: Javier Carrasco <javier.carrasco.cruz@...il.com>
Applied.
> ---
>  drivers/iio/pressure/zpa2326.c | 2 ++
>  1 file changed, 2 insertions(+)
> 
> diff --git a/drivers/iio/pressure/zpa2326.c b/drivers/iio/pressure/zpa2326.c
> index 950f8dee2b26..b4c6c7c47256 100644
> --- a/drivers/iio/pressure/zpa2326.c
> +++ b/drivers/iio/pressure/zpa2326.c
> @@ -586,6 +586,8 @@ static int zpa2326_fill_sample_buffer(struct iio_dev               *indio_dev,
>  	}   sample;
>  	int err;
>  
> +	memset(&sample, 0, sizeof(sample));
> +
>  	if (test_bit(0, indio_dev->active_scan_mask)) {
>  		/* Get current pressure from hardware FIFO. */
>  		err = zpa2326_dequeue_pressure(indio_dev, &sample.pressure);
>