linux-kernel - Re: [PATCH 04/11] iio: adc: rockchip_saradc: fix information leak in triggered buffer

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Message-ID: <20241130205937.19a24818@jic23-huawei>
Date: Sat, 30 Nov 2024 20:59:37 +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 04/11] iio: adc: rockchip_saradc: fix information leak
 in triggered buffer

On Mon, 25 Nov 2024 22:16:12 +0100
Javier Carrasco <javier.carrasco.cruz@...il.com> wrote:

> The 'data' 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: 4e130dc7b413 ("iio: adc: rockchip_saradc: Add support iio buffers")
> Signed-off-by: Javier Carrasco <javier.carrasco.cruz@...il.com>
Applied.
> ---
>  drivers/iio/adc/rockchip_saradc.c | 2 ++
>  1 file changed, 2 insertions(+)
> 
> diff --git a/drivers/iio/adc/rockchip_saradc.c b/drivers/iio/adc/rockchip_saradc.c
> index 240cfa391674..dfd47a6e1f4a 100644
> --- a/drivers/iio/adc/rockchip_saradc.c
> +++ b/drivers/iio/adc/rockchip_saradc.c
> @@ -368,6 +368,8 @@ static irqreturn_t rockchip_saradc_trigger_handler(int irq, void *p)
>  	int ret;
>  	int i, j = 0;
>  
> +	memset(&data, 0, sizeof(data));
> +
>  	mutex_lock(&info->lock);
>  
>  	iio_for_each_active_channel(i_dev, i) {
>