iio: adc: ti-ads1119: fix information leak in triggered buffer

The 'scan' local struct is used to push data to user space from a
triggered buffer, but it has a hole between the sample (unsigned int)
and the timestamp. This hole is never initialized.

Initialize the struct to zero before using it to avoid pushing
uninitialized information to userspace.

Cc: [email protected]
Fixes: a930688 ("iio: adc: ti-ads1119: Add driver")
Signed-off-by: Javier Carrasco <[email protected]>
Reviewed-by: Francesco Dolcini <[email protected]>
Link: https://patch.msgid.link/[email protected]
Signed-off-by: Jonathan Cameron <[email protected]>

Author: javiercarrascocruz

drivers/iio/adc/ti-ads1119.c

@@ -506,6 +506,8 @@ static irqreturn_t ads1119_trigger_handler(int irq, void *private)
 	unsigned int index;
 	int ret;
 
+	memset(&scan, 0, sizeof(scan));
+
 	if (!iio_trigger_using_own(indio_dev)) {
 		index = find_first_bit(indio_dev->active_scan_mask,
 				       iio_get_masklength(indio_dev));