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Message-Id: <20170323150323.271584-1-arnd@arndb.de>
Date: Thu, 23 Mar 2017 16:03:11 +0100
From: Arnd Bergmann <arnd@...db.de>
To: Luca Tettamanti <kronos.it@...il.com>,
Jean Delvare <jdelvare@...e.com>,
Guenter Roeck <linux@...ck-us.net>
Cc: Arnd Bergmann <arnd@...db.de>, linux-hwmon@...r.kernel.org,
linux-kernel@...r.kernel.org
Subject: [PATCH] hwmon: asus_atk0110.c 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 <arnd@...db.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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