4.9-stable review patch. If anyone has any objections, please let me know.
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From: Arnd Bergmann arnd@arndb.de
[ Upstream commit a2125d02443e9a4e68bcfd9f8004fa23239e8329 ]
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 arnd@arndb.de Reviewed-by: Luca Tettamanti kronos.it@gmail.com Signed-off-by: Guenter Roeck linux@roeck-us.net Signed-off-by: Sasha Levin alexander.levin@verizon.com Signed-off-by: Greg Kroah-Hartman gregkh@linuxfoundation.org --- drivers/hwmon/asus_atk0110.c | 3 +++ 1 file changed, 3 insertions(+)
--- a/drivers/hwmon/asus_atk0110.c +++ b/drivers/hwmon/asus_atk0110.c @@ -646,6 +646,9 @@ static int atk_read_value(struct atk_sen else err = atk_read_value_new(sensor, value);
+ if (err) + return err; + sensor->is_valid = true; sensor->last_updated = jiffies; sensor->cached_value = *value;