linux-kernel - [PATCH] mfd: cros_ec: Fix leak in sequence

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Date:	Sat, 18 Jul 2015 19:30:33 +0200
From:	Christian Engelmayer <cengelma@....at>
To:	olof@...om.net
Cc:	lee.jones@...aro.org, javier.martinez@...labora.co.uk,
	gwendal@...omium.org, rspangler@...omium.org,
	wfrichar@...omium.org, smbarber@...omium.org,
	linux-kernel@...r.kernel.org,
	Christian Engelmayer <cengelma@....at>
Subject: [PATCH] mfd: cros_ec: Fix leak in sequence_store()

The allocated cros_ec_command message structure is not freed in function
sequence_store(). Make sure that 'msg' is freed in all exit paths.
Detected by Coverity CID 1309667.

Signed-off-by: Christian Engelmayer <cengelma@....at>
---
Compile tested only. Applies against linux-next.
---
 drivers/platform/chrome/cros_ec_lightbar.c | 23 ++++++++++++++---------
 1 file changed, 14 insertions(+), 9 deletions(-)

diff --git a/drivers/platform/chrome/cros_ec_lightbar.c b/drivers/platform/chrome/cros_ec_lightbar.c
index 144e09df9b84..fc30a991b738 100644
--- a/drivers/platform/chrome/cros_ec_lightbar.c
+++ b/drivers/platform/chrome/cros_ec_lightbar.c
@@ -352,10 +352,6 @@ static ssize_t sequence_store(struct device *dev, struct device_attribute *attr,
 	struct cros_ec_dev *ec = container_of(dev,
 					      struct cros_ec_dev, class_dev);
 
-	msg = alloc_lightbar_cmd_msg(ec);
-	if (!msg)
-		return -ENOMEM;
-
 	for (len = 0; len < count; len++)
 		if (!isalnum(buf[len]))
 			break;
@@ -370,21 +366,30 @@ static ssize_t sequence_store(struct device *dev, struct device_attribute *attr,
 			return ret;
 	}
 
+	msg = alloc_lightbar_cmd_msg(ec);
+	if (!msg)
+		return -ENOMEM;
+
 	param = (struct ec_params_lightbar *)msg->data;
 	param->cmd = LIGHTBAR_CMD_SEQ;
 	param->seq.num = num;
 	ret = lb_throttle();
 	if (ret)
-		return ret;
+		goto exit;
 
 	ret = cros_ec_cmd_xfer(ec->ec_dev, msg);
 	if (ret < 0)
-		return ret;
+		goto exit;
 
-	if (msg->result != EC_RES_SUCCESS)
-		return -EINVAL;
+	if (msg->result != EC_RES_SUCCESS) {
+		ret = -EINVAL;
+		goto exit;
+	}
 
-	return count;
+	ret = count;
+exit:
+	kfree(msg);
+	return ret;
 }
 
 /* Module initialization */
-- 
1.9.1

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