commit 3806b45ba4655147a011df03242cc197ab986c43
author Dan Carpenter <dan.carpenter@oracle.com> Thu Dec 12 08:05:33 2013 +0100
committer Jean Delvare <khali@endymion.delvare> Thu Dec 12 08:05:33 2013 +0100
tree 6f16fdaab2125caf51cd1c9b2fb9cd9e1eb3674f
parent 33a7ab91d509fa33b4bcd3ce0038cc80298050da

hwmon: Prevent some divide by zeros in FAN_TO_REG()

The "rpm * div" operations can overflow here, so this patch adds an
upper limit to rpm to prevent that.  Jean Delvare helped me with this
patch.

Signed-off-by: Dan Carpenter <dan.carpenter@oracle.com>
Acked-by: Roger Lucas <vt8231@hiddenengine.co.uk>
Cc: stable@vger.kernel.org
Signed-off-by: Jean Delvare <khali@linux-fr.org>

drivers/hwmon/sis5595.c

diff --git a/drivers/hwmon/sis5595.c b/drivers/hwmon/sis5595.c
index 1404e63..72a8897 100644
--- a/drivers/hwmon/sis5595.c
+++ b/drivers/hwmon/sis5595.c
@@ -141,6 +141,8 @@
 {
 	if (rpm <= 0)
 		return 255;
+	if (rpm > 1350000)
+		return 1;
 	return clamp_val((1350000 + rpm * div / 2) / (rpm * div), 1, 254);
 }