Fix overflows seen when writing large values into voltage limit,
temperature limit, temperature offset, and DAC attributes.
Overflows are seen due to unbound multiplications and additions.
Signed-off-by: Guenter Roeck <linux@xxxxxxxxxxxx>
---
drivers/hwmon/adm1026.c | 26 +++++++++++++++++---------
1 file changed, 17 insertions(+), 9 deletions(-)
diff --git a/drivers/hwmon/adm1026.c b/drivers/hwmon/adm1026.c
index e67b9a50ac7c..b2a5d9e5c590 100644
--- a/drivers/hwmon/adm1026.c
+++ b/drivers/hwmon/adm1026.c
@@ -197,8 +197,9 @@ static int adm1026_scaling[] = { /* .001 Volts */
};
#define NEG12_OFFSET 16000
#define SCALE(val, from, to) (((val)*(to) + ((from)/2))/(from))
-#define INS_TO_REG(n, val) (clamp_val(SCALE(val, adm1026_scaling[n], 192),\
- 0, 255))
+#define INS_TO_REG(n, val) \
+ SCALE(clamp_val(val, 0, 255 * adm1026_scaling[n] / 192), \
+ adm1026_scaling[n], 192)
#define INS_FROM_REG(n, val) (SCALE(val, 192, adm1026_scaling[n]))
/*
@@ -215,11 +216,11 @@ static int adm1026_scaling[] = { /* .001 Volts */
#define DIV_TO_REG(val) ((val) >= 8 ? 3 : (val) >= 4 ? 2 : (val) >= 2 ? 1 : 0)
/* Temperature is reported in 1 degC increments */
-#define TEMP_TO_REG(val) (clamp_val(((val) + ((val) < 0 ? -500 : 500)) \
- / 1000, -127, 127))
+#define TEMP_TO_REG(val) DIV_ROUND_CLOSEST(clamp_val(val, -128000, 127000), \
+ 1000)
#define TEMP_FROM_REG(val) ((val) * 1000)
-#define OFFSET_TO_REG(val) (clamp_val(((val) + ((val) < 0 ? -500 : 500)) \
- / 1000, -127, 127))
+#define OFFSET_TO_REG(val) DIV_ROUND_CLOSEST(clamp_val(val, -128000, 127000), \
+ 1000)
#define OFFSET_FROM_REG(val) ((val) * 1000)
#define PWM_TO_REG(val) (clamp_val(val, 0, 255))
@@ -233,7 +234,8 @@ static int adm1026_scaling[] = { /* .001 Volts */
* indicates that the DAC could be used to drive the fans, but in our
* example board (Arima HDAMA) it isn't connected to the fans at all.
*/
-#define DAC_TO_REG(val) (clamp_val(((((val) * 255) + 500) / 2500), 0, 255))
+#define DAC_TO_REG(val) DIV_ROUND_CLOSEST(clamp_val(val, 0, 2500) * 255, \
+ 2500)
#define DAC_FROM_REG(val) (((val) * 2500) / 255)
/*
@@ -593,7 +595,10 @@ static ssize_t set_in16_min(struct device *dev, struct device_attribute *attr,
return err;
mutex_lock(&data->update_lock);
- data->in_min[16] = INS_TO_REG(16, val + NEG12_OFFSET);
+ data->in_min[16] = INS_TO_REG(16,
+ clamp_val(val, INT_MIN,
+ INT_MAX - NEG12_OFFSET) +
+ NEG12_OFFSET);
adm1026_write_value(client, ADM1026_REG_IN_MIN[16], data->in_min[16]);
mutex_unlock(&data->update_lock);
return count;
@@ -618,7 +623,10 @@ static ssize_t set_in16_max(struct device *dev, struct device_attribute *attr,
return err;
mutex_lock(&data->update_lock);
- data->in_max[16] = INS_TO_REG(16, val+NEG12_OFFSET);
+ data->in_max[16] = INS_TO_REG(16,
+ clamp_val(val, INT_MIN,
+ INT_MAX - NEG12_OFFSET) +
+ NEG12_OFFSET);
adm1026_write_value(client, ADM1026_REG_IN_MAX[16], data->in_max[16]);
mutex_unlock(&data->update_lock);
return count;
--
2.5.0
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