netdev - [PATCH] net-sysfs: Fix reference count leak in rx|netdev_queue_add

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Date:   Tue, 19 Nov 2019 11:51:21 +0200
From:   jouni.hogander@...kie.com
To:     netdev@...r.kernel.org
Cc:     Jouni Hogander <jouni.hogander@...kie.com>,
        David Miller <davem@...emloft.net>,
        Lukas Bulwahn <lukas.bulwahn@...il.com>
Subject: [PATCH] net-sysfs: Fix reference count leak in rx|netdev_queue_add_kobject

From: Jouni Hogander <jouni.hogander@...kie.com>

kobject_init_and_add takes reference even when it fails. This has
to be given up by the caller in error handling. Otherwise memory
allocated by kobject_init_and_add is never freed.

Cc: David Miller <davem@...emloft.net>
Cc: Lukas Bulwahn <lukas.bulwahn@...il.com>
Signed-off-by: Jouni Hogander <jouni.hogander@...kie.com>
---
 net/core/net-sysfs.c | 24 +++++++++++++-----------
 1 file changed, 13 insertions(+), 11 deletions(-)

diff --git a/net/core/net-sysfs.c b/net/core/net-sysfs.c
index 865ba6ca16eb..4f404bf33e44 100644
--- a/net/core/net-sysfs.c
+++ b/net/core/net-sysfs.c
@@ -923,21 +923,23 @@ static int rx_queue_add_kobject(struct net_device *dev, int index)
 	error = kobject_init_and_add(kobj, &rx_queue_ktype, NULL,
 				     "rx-%u", index);
 	if (error)
-		return error;
+		goto err;
 
 	dev_hold(queue->dev);
 
 	if (dev->sysfs_rx_queue_group) {
 		error = sysfs_create_group(kobj, dev->sysfs_rx_queue_group);
-		if (error) {
-			kobject_put(kobj);
-			return error;
-		}
+		if (error)
+			goto err;
 	}
 
 	kobject_uevent(kobj, KOBJ_ADD);
 
 	return error;
+
+err:
+	kobject_put(kobj);
+	return error;
 }
 #endif /* CONFIG_SYSFS */
 
@@ -1461,21 +1463,21 @@ static int netdev_queue_add_kobject(struct net_device *dev, int index)
 	error = kobject_init_and_add(kobj, &netdev_queue_ktype, NULL,
 				     "tx-%u", index);
 	if (error)
-		return error;
+		goto err;
 
 	dev_hold(queue->dev);
 
 #ifdef CONFIG_BQL
 	error = sysfs_create_group(kobj, &dql_group);
-	if (error) {
-		kobject_put(kobj);
-		return error;
-	}
+	if (error)
+		goto err;
 #endif
 
 	kobject_uevent(kobj, KOBJ_ADD);
 
-	return 0;
+err:
+	kobject_put(kobj);
+	return error;
 }
 #endif /* CONFIG_SYSFS */
 
-- 
2.17.1