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[AUTOSEL,for,4.9,035/100] hwmon: (asus_atk0110) fix uninitialized data access

Message ID 20171213015722.6722-10-alexander.levin@verizon.com
State New
Headers show
Series None | expand

Commit Message

Levin, Alexander (Sasha Levin) Dec. 13, 2017, 1:57 a.m. UTC 
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>

---
 drivers/hwmon/asus_atk0110.c | 3 +++
 1 file changed, 3 insertions(+)

-- 
2.11.0
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Patch

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;