From fe04f24b831cf384eda9798e1af642b96ca19d29 Mon Sep 17 00:00:00 2001
From: Axel Lin <axel.lin@ingics.com>
Date: Wed, 6 Aug 2014 08:28:02 +0800
Subject: [PATCH] hwmon: (w83791d) Fix vrm write operation

vrm is an u8, so the written value needs to be limited to [0, 255].

Signed-off-by: Axel Lin <axel.lin@ingics.com>
Signed-off-by: Guenter Roeck <linux@roeck-us.net>
---
 drivers/hwmon/w83791d.c | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/drivers/hwmon/w83791d.c b/drivers/hwmon/w83791d.c
index cb3765fec98c..001df856913f 100644
--- a/drivers/hwmon/w83791d.c
+++ b/drivers/hwmon/w83791d.c
@@ -1181,6 +1181,9 @@ static ssize_t store_vrm_reg(struct device *dev,
 	if (err)
 		return err;
 
+	if (val > 255)
+		return -EINVAL;
+
 	data->vrm = val;
 	return count;
 }