[PATCH] hwmon: Fix missing boundary check when setting W83627THF in0 limits

Add SENSORS_LIMIT in store VCore limit functions. This fixes a potential
u8 overflow on out-of-range user input.

Signed-off-by: Jean Delvare <khali@linux-fr.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>

diff --git a/drivers/hwmon/w83627hf.c b/drivers/hwmon/w83627hf.c
index 4e9a04e..bbb3dcd 100644 (file)
--- a/drivers/hwmon/w83627hf.c
+++ b/drivers/hwmon/w83627hf.c
@@ -456,7 +456,9 @@ static ssize_t store_regs_in_min0(struct device *dev, struct device_attribute *a
                (w83627thf == data->type || w83637hf == data->type))
 
                /* use VRM9 calculation */
-               data->in_min[0] = (u8)(((val * 100) - 70000 + 244) / 488);
+               data->in_min[0] =
+                       SENSORS_LIMIT(((val * 100) - 70000 + 244) / 488, 0,
+                                       255);
        else
                /* use VRM8 (standard) calculation */
                data->in_min[0] = IN_TO_REG(val);
@@ -481,7 +483,9 @@ static ssize_t store_regs_in_max0(struct device *dev, struct device_attribute *a
                (w83627thf == data->type || w83637hf == data->type))
                
                /* use VRM9 calculation */
-               data->in_max[0] = (u8)(((val * 100) - 70000 + 244) / 488);
+               data->in_max[0] =
+                       SENSORS_LIMIT(((val * 100) - 70000 + 244) / 488, 0,
+                                       255);
        else
                /* use VRM8 (standard) calculation */
                data->in_max[0] = IN_TO_REG(val);