linux-kernel - [PATCH 02/11] iio: adc: ti-ads1119: fix information leak in triggered buffer

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Message-Id: <20241125-iio_memset_scan_holes-v1-2-0cb6e98d895c@gmail.com>
Date: Mon, 25 Nov 2024 22:16:10 +0100
From: Javier Carrasco <javier.carrasco.cruz@...il.com>
To: Jonathan Cameron <jic23@...nel.org>, 
 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>
Cc: 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>, 
 Javier Carrasco <javier.carrasco.cruz@...il.com>, stable@...r.kernel.org
Subject: [PATCH 02/11] 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: stable@...r.kernel.org
Fixes: a9306887eba4 ("iio: adc: ti-ads1119: Add driver")
Signed-off-by: Javier Carrasco <javier.carrasco.cruz@...il.com>
---
 drivers/iio/adc/ti-ads1119.c | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/drivers/iio/adc/ti-ads1119.c b/drivers/iio/adc/ti-ads1119.c
index e9d9d4d46d38..2615a275acb3 100644
--- a/drivers/iio/adc/ti-ads1119.c
+++ b/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));

-- 
2.43.0