From: Guenter Roeck Date: Fri, 18 Jul 2014 14:31:18 +0000 (-0700) Subject: hwmon: (smsc47m192) Fix temperature limit and vrm write operations X-Git-Tag: firefly_0821_release~176^2~3555^2 X-Git-Url: http://demsky.eecs.uci.edu/git/?a=commitdiff_plain;h=043572d5444116b9d9ad8ae763cf069e7accbc30;p=firefly-linux-kernel-4.4.55.git hwmon: (smsc47m192) Fix temperature limit and vrm write operations Temperature limit clamps are applied after converting the temperature from milli-degrees C to degrees C, so either the clamp limit needs to be specified in degrees C, not milli-degrees C, or clamping must happen before converting to degrees C. Use the latter method to avoid overflows. vrm is an u8, so the written value needs to be limited to [0, 255]. Cc: Axel Lin Cc: stable@vger.kernel.org Signed-off-by: Guenter Roeck Reviewed-by: Jean Delvare --- diff --git a/drivers/hwmon/smsc47m192.c b/drivers/hwmon/smsc47m192.c index efee4c59239f..34b9a601ad07 100644 --- a/drivers/hwmon/smsc47m192.c +++ b/drivers/hwmon/smsc47m192.c @@ -86,7 +86,7 @@ static inline u8 IN_TO_REG(unsigned long val, int n) */ static inline s8 TEMP_TO_REG(int val) { - return clamp_val(SCALE(val, 1, 1000), -128000, 127000); + return SCALE(clamp_val(val, -128000, 127000), 1, 1000); } static inline int TEMP_FROM_REG(s8 val) @@ -384,6 +384,8 @@ static ssize_t set_vrm(struct device *dev, struct device_attribute *attr, err = kstrtoul(buf, 10, &val); if (err) return err; + if (val > 255) + return -EINVAL; data->vrm = val; return count;