linux-kernel - [PATCH 07/11] iio: light: bh1745: fix information leak in triggered buffer

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Message-Id: <20241125-iio_memset_scan_holes-v1-7-0cb6e98d895c@gmail.com>
Date: Mon, 25 Nov 2024 22:16:15 +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 07/11] iio: light: bh1745: fix information leak in
 triggered buffer

The 'scan' 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: eab35358aae7 ("iio: light: ROHM BH1745 colour sensor")
Signed-off-by: Javier Carrasco <javier.carrasco.cruz@...il.com>
---
 drivers/iio/light/bh1745.c | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/drivers/iio/light/bh1745.c b/drivers/iio/light/bh1745.c
index 23e9f16090cc..2ffc839c7501 100644
--- a/drivers/iio/light/bh1745.c
+++ b/drivers/iio/light/bh1745.c
@@ -746,6 +746,8 @@ static irqreturn_t bh1745_trigger_handler(int interrupt, void *p)
 	int i;
 	int j = 0;
 
+	memset(&scan, 0, sizeof(scan));
+
 	iio_for_each_active_channel(indio_dev, i) {
 		ret = regmap_bulk_read(data->regmap, BH1745_RED_LSB + 2 * i,
 				       &value, 2);

-- 
2.43.0