hwmon: (lm90) Add range check to set_update_interval

When writing the update_interval attribute, the parameter value was
not range checked, which could cause an integer overflow and result
in an arbitrary update interval. Fix by limiting the value range to
<0, 100000>.
Reported-by: NJean Delvare <khali@linux-fr.org>
Signed-off-by: NGuenter Roeck <linux@roeck-us.net>
Signed-off-by: NJean Delvare <khali@linux-fr.org>

drivers/hwmon/lm90.c

@@ -917,7 +917,7 @@ static ssize_t set_update_interval(struct device *dev,
 		return err;
 
 	mutex_lock(&data->update_lock);
-	lm90_set_convrate(client, data, val);
+	lm90_set_convrate(client, data, SENSORS_LIMIT(val, 0, 100000));
 	mutex_unlock(&data->update_lock);
 
 	return count;