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.
Signed-off-by: Guenter Roeck <linux@xxxxxxxxxxxx>
---
v2: Improved and simplified clamping
drivers/hwmon/adm9240.c | 9 ++++++---
1 file 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)
--
2.5.0
--
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