Messages in this thread | | | Date | Thu, 23 Mar 2017 13:26:05 -0700 | From | Guenter Roeck <> | Subject | Re: [PATCH] hwmon: asus_atk0110.c fix uninitialized data access |
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On Thu, Mar 23, 2017 at 04:03:11PM +0100, Arnd Bergmann wrote: > 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. > Nice catch!
Applied, thanks.
Guenter
> Fixes: 2c03d07ad54d ("hwmon: Add Asus ATK0110 support") > Signed-off-by: Arnd Bergmann <arnd@arndb.de> > --- > drivers/hwmon/asus_atk0110.c | 3 +++ > 1 file changed, 3 insertions(+) > > diff --git a/drivers/hwmon/asus_atk0110.c b/drivers/hwmon/asus_atk0110.c > index cccef87963e0..975c43d446f8 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; > -- > 2.9.0 >
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