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authorGuenter Roeck <linux@roeck-us.net>2016-12-05 05:20:52 +0300
committerGuenter Roeck <linux@roeck-us.net>2016-12-12 22:33:44 +0300
commit59715f4d16c27985b6866ebdced76e4e9cd63c33 (patch)
tree67735f7f317298618673d75360c00079ea67593c /drivers/hwmon/emc6w201.c
parentca1b10b8250247fb5f241d1cb894c102203378bb (diff)
downloadlinux-59715f4d16c27985b6866ebdced76e4e9cd63c33.tar.xz
hwmon: (emcw201) Fix overflows seen when writing into limit attributes
Writes into temperature and voltage limit attributes can overflow due to multiplications with unchecked parameters. Also, the input parameter to DIV_ROUND_CLOSEST() needis to be range checked. Reviewed-by: Jean Delvare <jdelvare@suse.de> Signed-off-by: Guenter Roeck <linux@roeck-us.net>
Diffstat (limited to 'drivers/hwmon/emc6w201.c')
-rw-r--r--drivers/hwmon/emc6w201.c8
1 files changed, 5 insertions, 3 deletions
diff --git a/drivers/hwmon/emc6w201.c b/drivers/hwmon/emc6w201.c
index f37fe2011640..4aee5adf9ef2 100644
--- a/drivers/hwmon/emc6w201.c
+++ b/drivers/hwmon/emc6w201.c
@@ -215,12 +215,13 @@ static ssize_t set_in(struct device *dev, struct device_attribute *devattr,
if (err < 0)
return err;
- val = DIV_ROUND_CLOSEST(val * 0xC0, nominal_mv[nr]);
+ val = clamp_val(val, 0, 255 * nominal_mv[nr] / 192);
+ val = DIV_ROUND_CLOSEST(val * 192, nominal_mv[nr]);
reg = (sf == min) ? EMC6W201_REG_IN_LOW(nr)
: EMC6W201_REG_IN_HIGH(nr);
mutex_lock(&data->update_lock);
- data->in[sf][nr] = clamp_val(val, 0, 255);
+ data->in[sf][nr] = val;
err = emc6w201_write8(client, reg, data->in[sf][nr]);
mutex_unlock(&data->update_lock);
@@ -252,12 +253,13 @@ static ssize_t set_temp(struct device *dev, struct device_attribute *devattr,
if (err < 0)
return err;
+ val = clamp_val(val, -127000, 127000);
val = DIV_ROUND_CLOSEST(val, 1000);
reg = (sf == min) ? EMC6W201_REG_TEMP_LOW(nr)
: EMC6W201_REG_TEMP_HIGH(nr);
mutex_lock(&data->update_lock);
- data->temp[sf][nr] = clamp_val(val, -127, 127);
+ data->temp[sf][nr] = val;
err = emc6w201_write8(client, reg, data->temp[sf][nr]);
mutex_unlock(&data->update_lock);