linux-kernel - Re: [PATCH 08/11] iio: adc: ti-ads8688: fix information leak in triggered buffer

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Message-ID: <20241130205247.47780c89@jic23-huawei>
Date: Sat, 30 Nov 2024 20:52:47 +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 08/11] iio: adc: ti-ads8688: fix information leak in
 triggered buffer

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

> The 'buffer' local array 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 array to zero before using it to avoid pushing
> uninitialized information to userspace.
> 
> Cc: stable@...r.kernel.org
> Fixes: 61fa5dfa5f52 ("iio: adc: ti-ads8688: Fix alignment of buffer in iio_push_to_buffers_with_timestamp()")
> Signed-off-by: Javier Carrasco <javier.carrasco.cruz@...il.com>
Applied.
> ---
>  drivers/iio/adc/ti-ads8688.c | 2 +-
>  1 file changed, 1 insertion(+), 1 deletion(-)
> 
> diff --git a/drivers/iio/adc/ti-ads8688.c b/drivers/iio/adc/ti-ads8688.c
> index 9b1814f1965a..a31658b760a4 100644
> --- a/drivers/iio/adc/ti-ads8688.c
> +++ b/drivers/iio/adc/ti-ads8688.c
> @@ -381,7 +381,7 @@ static irqreturn_t ads8688_trigger_handler(int irq, void *p)
>  	struct iio_poll_func *pf = p;
>  	struct iio_dev *indio_dev = pf->indio_dev;
>  	/* Ensure naturally aligned timestamp */
> -	u16 buffer[ADS8688_MAX_CHANNELS + sizeof(s64)/sizeof(u16)] __aligned(8);
> +	u16 buffer[ADS8688_MAX_CHANNELS + sizeof(s64)/sizeof(u16)] __aligned(8) = { };
>  	int i, j = 0;
>  
>  	iio_for_each_active_channel(indio_dev, i) {
>