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Date: Mon, 11 Feb 2019 15:18:55 +0100 From: Greg Kroah-Hartman <gregkh@...uxfoundation.org> To: linux-kernel@...r.kernel.org Cc: Greg Kroah-Hartman <gregkh@...uxfoundation.org>, stable@...r.kernel.org, Kangjie Lu <kjlu@....edu>, Guenter Roeck <linux@...ck-us.net>, Sasha Levin <sashal@...nel.org> Subject: [PATCH 4.14 137/205] hwmon: (lm80) fix a missing check of bus read in lm80 probe 4.14-stable review patch. If anyone has any objections, please let me know. ------------------ [ Upstream commit 9aa3aa15f4c2f74f47afd6c5db4b420fadf3f315 ] 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> Signed-off-by: Guenter Roeck <linux@...ck-us.net> Signed-off-by: Sasha Levin <sashal@...nel.org> --- 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 04f9df0d2341..0e30fa00204c 100644 --- a/drivers/hwmon/lm80.c +++ b/drivers/hwmon/lm80.c @@ -628,6 +628,7 @@ 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) @@ -640,8 +641,14 @@ 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); -- 2.19.1
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