From: Arnd Bergmann Date: Thu, 23 Mar 2017 15:03:11 +0000 (+0100) Subject: hwmon: (asus_atk0110) fix uninitialized data access X-Git-Tag: v4.14-rc1~1236^2 X-Git-Url: http://review.tizen.org/git/?a=commitdiff_plain;h=a2125d02443e9a4e68bcfd9f8004fa23239e8329;p=platform%2Fkernel%2Flinux-rpi.git hwmon: (asus_atk0110) fix uninitialized data access The latest gcc-7 snapshot adds a warning to point out that when atk_read_value_old or atk_read_value_new fails, we copy uninitialized data into sensor->cached_value: drivers/hwmon/asus_atk0110.c: In function 'atk_input_show': drivers/hwmon/asus_atk0110.c:651:26: error: 'value' may be used uninitialized in this function [-Werror=maybe-uninitialized] Adding an error check avoids this. All versions of the driver are affected. Fixes: 2c03d07ad54d ("hwmon: Add Asus ATK0110 support") Signed-off-by: Arnd Bergmann Reviewed-by: Luca Tettamanti Signed-off-by: Guenter Roeck --- diff --git a/drivers/hwmon/asus_atk0110.c b/drivers/hwmon/asus_atk0110.c index cccef87..975c43d 100644 --- a/drivers/hwmon/asus_atk0110.c +++ b/drivers/hwmon/asus_atk0110.c @@ -646,6 +646,9 @@ static int atk_read_value(struct atk_sensor_data *sensor, u64 *value) else err = atk_read_value_new(sensor, value); + if (err) + return err; + sensor->is_valid = true; sensor->last_updated = jiffies; sensor->cached_value = *value;