linux-kernel - [PATCH v2] iio/adjd_s311: Fix potential memory leak in adjd_s311_update_scan

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Date:	Wed,  8 Aug 2012 13:58:55 +0400
From:	Alexey Khoroshilov <khoroshilov@...ras.ru>
To:	Peter Meerwald <pmeerw@...erw.net>
Cc:	Alexey Khoroshilov <khoroshilov@...ras.ru>,
	Jonathan Cameron <jic23@....ac.uk>, linux-iio@...r.kernel.org,
	linux-kernel@...r.kernel.org, ldv-project@...ras.ru,
	Lars-Peter Clausen <lars@...afoo.de>
Subject: [PATCH v2] iio/adjd_s311: Fix potential memory leak in adjd_s311_update_scan_mode()

Do not leak memory by updating pointer with potentially NULL realloc return value.
There is no need to preserve data in the buffer,
so replace krealloc() by kfree()-kmalloc() pair.

Found by Linux Driver Verification project (linuxtesting.org).

Signed-off-by: Alexey Khoroshilov <khoroshilov@...ras.ru>
---
 drivers/iio/light/adjd_s311.c |    7 ++++---
 1 file changed, 4 insertions(+), 3 deletions(-)

diff --git a/drivers/iio/light/adjd_s311.c b/drivers/iio/light/adjd_s311.c
index 1cbb449..9a99f43 100644
--- a/drivers/iio/light/adjd_s311.c
+++ b/drivers/iio/light/adjd_s311.c
@@ -271,9 +271,10 @@ static int adjd_s311_update_scan_mode(struct iio_dev *indio_dev,
 	const unsigned long *scan_mask)
 {
 	struct adjd_s311_data *data = iio_priv(indio_dev);
-	data->buffer = krealloc(data->buffer, indio_dev->scan_bytes,
-				GFP_KERNEL);
-	if (!data->buffer)
+
+	kfree(data->buffer);
+	data->buffer = kmalloc(indio_dev->scan_bytes, GFP_KERNEL);
+	if (data->buffer == NULL)
 		return -ENOMEM;
 
 	return 0;
-- 
1.7.9.5

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