linux-kernel - [PATCH 4.1 102/123] hwmon: (nct7802) Fix integer overflow seen when writing voltage limits

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Date:	Sat,  8 Aug 2015 15:09:40 -0700
From:	Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:	linux-kernel@...r.kernel.org
Cc:	Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
	stable@...r.kernel.org,
	Constantine Shulyupin <const@...eLinux.com>,
	Jean Delvare <jdelvare@...e.de>,
	Guenter Roeck <linux@...ck-us.net>
Subject: [PATCH 4.1 102/123] hwmon: (nct7802) Fix integer overflow seen when writing voltage limits

4.1-stable review patch.  If anyone has any objections, please let me know.

------------------

From: Guenter Roeck <linux@...ck-us.net>

commit 9200bc4c28cd8992eb5379345abd6b4f0c93df16 upstream.

Writing a large value into a voltage limit attribute can result
in an overflow due to an auto-conversion from unsigned long to
unsigned int.

Cc: Constantine Shulyupin <const@...eLinux.com>
Reviewed-by: Jean Delvare <jdelvare@...e.de>
Signed-off-by: Guenter Roeck <linux@...ck-us.net>
Signed-off-by: Greg Kroah-Hartman <gregkh@...uxfoundation.org>

---
 drivers/hwmon/nct7802.c |    2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

--- a/drivers/hwmon/nct7802.c
+++ b/drivers/hwmon/nct7802.c
@@ -195,7 +195,7 @@ abort:
 }
 
 static int nct7802_write_voltage(struct nct7802_data *data, int nr, int index,
-				 unsigned int voltage)
+				 unsigned long voltage)
 {
 	int shift = 8 - REG_VOLTAGE_LIMIT_MSB_SHIFT[index - 1][nr];
 	int err;


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