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hwmon: (adm9240) Fix overflows seen when writing into limit attributes

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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>
This commit is contained in:
Guenter Roeck 2016-11-20 10:14:09 -08:00
parent 1b109c49b7
commit 0fb620c433
1 changed files with 6 additions and 3 deletions
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9
drivers/hwmon/adm9240.c
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@ -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)