diff options
| author | Guenter Roeck | 2016-11-20 10:14:09 -0800 |
|---|---|---|
| committer | Guenter Roeck | 2016-12-09 06:09:23 -0800 |
| commit | 0fb620c4334eab14e85b7f66389e9061a225fb7e (patch) | |
| tree | 4e7434d74b559ff6055fc1c0b1442d4d097137e3 /drivers/hwmon/adm9240.c | |
| parent | 1b109c49b72dc3cb8392bbc22bad662f71b8fd80 (diff) | |
hwmon: (adm9240) Fix overflows seen when writing into limit attributes
Module test reports:
in0_min: Suspected overflow: [3320 vs. 0]
in0_max: Suspected overflow: [3320 vs. 0]
in4_min: Suspected overflow: [15938 vs. 0]
in4_max: Suspected overflow: [15938 vs. 0]
temp1_max: Suspected overflow: [127000 vs. 0]
temp1_max_hyst: Suspected overflow: [127000 vs. 0]
aout_output: Suspected overflow: [1250 vs. 0]
Code analysis reveals that the overflows are caused by conversions
from unsigned long to long to int, combined with multiplications on
passed values.
Reviewed-by: Jean Delvare <jdelvare@suse.de>
Signed-off-by: Guenter Roeck <linux@roeck-us.net>
Diffstat (limited to 'drivers/hwmon/adm9240.c')
| -rw-r--r-- | drivers/hwmon/adm9240.c | 9 |
1 files changed, 6 insertions, 3 deletions
diff --git a/drivers/hwmon/adm9240.c b/drivers/hwmon/adm9240.c index 2fe1828bd10b..72bf2489511e 100644 --- a/drivers/hwmon/adm9240.c +++ b/drivers/hwmon/adm9240.c @@ -98,13 +98,15 @@ static inline unsigned int IN_FROM_REG(u8 reg, int n) static inline u8 IN_TO_REG(unsigned long val, int n) { - return clamp_val(SCALE(val, 192, nom_mv[n]), 0, 255); + val = clamp_val(val, 0, nom_mv[n] * 255 / 192); + return SCALE(val, 192, nom_mv[n]); } /* temperature range: -40..125, 127 disables temperature alarm */ static inline s8 TEMP_TO_REG(long val) { - return clamp_val(SCALE(val, 1, 1000), -40, 127); + val = clamp_val(val, -40000, 127000); + return SCALE(val, 1, 1000); } /* two fans, each with low fan speed limit */ @@ -122,7 +124,8 @@ static inline unsigned int FAN_FROM_REG(u8 reg, u8 div) /* analog out 0..1250mV */ static inline u8 AOUT_TO_REG(unsigned long val) { - return clamp_val(SCALE(val, 255, 1250), 0, 255); + val = clamp_val(val, 0, 1250); + return SCALE(val, 255, 1250); } static inline unsigned int AOUT_FROM_REG(u8 reg) |