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hwmon: (lm85) Fix various errors on attribute writes

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Temperature limit register writes did not account for negative numbers.
As a result, writing -127000 resulted in -126000 written into the
temperature limit register. This problem affected temp[1-3]_min,
temp[1-3]_max, temp[1-3]_auto_temp_crit, and temp[1-3]_auto_temp_min.

When writing pwm[1-3]_freq, a long variable was auto-converted into an int
without range check. Wiring values larger than MAXINT resulted in unexpected
register values.

When writing temp[1-3]_auto_temp_max, an unsigned long variable was
auto-converted into an int without range check. Writing values larger than
MAXINT resulted in unexpected register values.

vrm is an u8, so the written value needs to be limited to [0, 255].

Cc: Axel Lin <axel.lin@ingics.com>
Cc: stable@vger.kernel.org
Reviewed-by: Axel Lin <axel.lin@ingics.com>
Signed-off-by: Guenter Roeck <linux@roeck-us.net>
This commit is contained in:
Guenter Roeck 2014-07-29 22:23:12 -07:00
parent 56de1377ad
commit 3248c3b771
1 changed files with 6 additions and 3 deletions
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9
drivers/hwmon/lm85.c
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@ -155,7 +155,7 @@ static inline u16 FAN_TO_REG(unsigned long val)
/* Temperature is reported in .001 degC increments */
#define TEMP_TO_REG(val) \
clamp_val(SCALE(val, 1000, 1), -127, 127)
DIV_ROUND_CLOSEST(clamp_val((val), -127000, 127000), 1000)
#define TEMPEXT_FROM_REG(val, ext) \
SCALE(((val) << 4) + (ext), 16, 1000)
#define TEMP_FROM_REG(val) ((val) * 1000)
@ -189,7 +189,7 @@ static const int lm85_range_map[] = {
13300, 16000, 20000, 26600, 32000, 40000, 53300, 80000
};
static int RANGE_TO_REG(int range)
static int RANGE_TO_REG(long range)
{
int i;
@ -211,7 +211,7 @@ static const int adm1027_freq_map[8] = { /* 1 Hz */
11, 15, 22, 29, 35, 44, 59, 88
};
static int FREQ_TO_REG(const int *map, int freq)
static int FREQ_TO_REG(const int *map, unsigned long freq)
{
int i;
@ -460,6 +460,9 @@ static ssize_t store_vrm_reg(struct device *dev, struct device_attribute *attr,
if (err)
return err;
if (val > 255)
return -EINVAL;
data->vrm = val;
return count;
}