[PATCH 3.16 090/370] hwmon: (ds620) Fix overflows seen when writing temperature limits

Ben Hutchings
2017-03-10T14:13:30Z

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

commit e36ce99ee0815d7919a7b589bfb66f3de50b6bc7 upstream.

Module test reports:

temp1_max: Suspected overflow: [160000 vs. 0]
temp1_min: Suspected overflow: [160000 vs. 0]

This is seen because the values passed when writing temperature limits
are unbound.

Reviewed-by: Jean Delvare <jdelvare@suse.de>
Fixes: 6099469805c2 ("hwmon: Support for Dallas Semiconductor DS620")
Signed-off-by: Guenter Roeck <linux@roeck-us.net>
Signed-off-by: Ben Hutchings <ben@decadent.org.uk>
---
drivers/hwmon/ds620.c | 2 +-
1 file changed, 1 insertion(+), 1 deletion(-)

--- a/drivers/hwmon/ds620.c
+++ b/drivers/hwmon/ds620.c
@@ -166,7 +166,7 @@ static ssize_t set_temp(struct device *d
if (res)
return res;

- val = (val * 10 / 625) * 8;
+ val = (clamp_val(val, -128000, 128000) * 10 / 625) * 8;

mutex_lock(&data->update_lock);
data->temp[attr->index] = val;