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@vger.kernel.org
Fixes: 4e130dc7b413 ("iio: adc: rockchip_saradc: Add support iio buffers")
Signed-off-by: Javier Carrasco <javier.carrasco.cruz@gmail.com>
---
 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) {

-- 
2.43.0

On Mon, 25 Nov 2024 22:16:12 +0100
Javier Carrasco <javier.carrasco.cruz@gmail.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@vger.kernel.org
> Fixes: 4e130dc7b413 ("iio: adc: rockchip_saradc: Add support iio buffers")
> Signed-off-by: Javier Carrasco <javier.carrasco.cruz@gmail.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) {
>