linux-kernel - [PATCH v2] hwmon: (lm80) fix a missing check of bus read in lm80 probe

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Message-Id: <20181221191039.1519-1-kjlu@umn.edu>
Date:   Fri, 21 Dec 2018 13:10:39 -0600
From:   Kangjie Lu <kjlu@....edu>
To:     kjlu@....edu
Cc:     pakki001@....edu, Jean Delvare <jdelvare@...e.com>,
        Guenter Roeck <linux@...ck-us.net>,
        linux-hwmon@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: [PATCH v2] hwmon: (lm80) fix a missing check of bus read in lm80 probe

In lm80_probe(), if lm80_read_value() fails, it returns a negative
error number which is stored to data->fan[f_min] and will be further
used. We should avoid using the data if the read fails.

The fix checks if lm80_read_value() fails, and if so, returns with the
error number.

Signed-off-by: Kangjie Lu <kjlu@....edu>
---
 drivers/hwmon/lm80.c | 11 +++++++++--
 1 file changed, 9 insertions(+), 2 deletions(-)

diff --git a/drivers/hwmon/lm80.c b/drivers/hwmon/lm80.c
index d91333557f04..85f797501aaf 100644
--- a/drivers/hwmon/lm80.c
+++ b/drivers/hwmon/lm80.c
@@ -627,6 +627,7 @@ static int lm80_probe(struct i2c_client *client,
 	struct device *dev = &client->dev;
 	struct device *hwmon_dev;
 	struct lm80_data *data;
+	int rv;
 
 	data = devm_kzalloc(dev, sizeof(struct lm80_data), GFP_KERNEL);
 	if (!data)
@@ -639,8 +640,14 @@ static int lm80_probe(struct i2c_client *client,
 	lm80_init_client(client);
 
 	/* A few vars need to be filled upon startup */
-	data->fan[f_min][0] = lm80_read_value(client, LM80_REG_FAN_MIN(1));
-	data->fan[f_min][1] = lm80_read_value(client, LM80_REG_FAN_MIN(2));
+	rv = lm80_read_value(client, LM80_REG_FAN_MIN(1));
+	if (rv < 0)
+		return rv;
+	data->fan[f_min][0] = rv;
+	rv = lm80_read_value(client, LM80_REG_FAN_MIN(2));
+	if (rv < 0)
+		return rv;
+	data->fan[f_min][1] = rv;
 
 	hwmon_dev = devm_hwmon_device_register_with_groups(dev, client->name,
 							   data, lm80_groups);
-- 
2.17.1