netdev - [PATCH 1/2] Revert "net-sysfs: Fix memory leak in netdev_register

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Date:   Fri, 12 Apr 2019 16:36:33 -0400
From:   Wang Hai <wanghai26@...wei.com>
To:     <davem@...emloft.net>, <idosch@...lanox.com>,
        <eric.dumazet@...il.com>, <alexander.h.duyck@...el.com>,
        <tyhicks@...onical.com>, <f.fainelli@...il.com>,
        <viro@...iv.linux.org.uk>, <amritha.nambiar@...el.com>,
        <joe@...ches.com>, <dmitry.torokhov@...il.com>,
        <andriy.shevchenko@...ux.intel.com>, <stephen@...workplumber.org>
CC:     <netdev@...r.kernel.org>, <linux-kernel@...r.kernel.org>,
        <wanghai26@...wei.com>
Subject: [PATCH 1/2] Revert "net-sysfs: Fix memory leak in netdev_register_kobject"

This reverts commit 6b70fc94afd165342876e53fc4b2f7d085009945.

The reverted bugfix will cause another issue.
Reported by syzbot+6024817a931b2830bc93@...kaller.appspotmail.com.
See https://syzkaller.appspot.com/x/log.txt?x=1737671b200000 for
details.

Signed-off-by: Wang Hai <wanghai26@...wei.com>
---
 net/core/net-sysfs.c | 14 +++++---------
 1 file changed, 5 insertions(+), 9 deletions(-)

diff --git a/net/core/net-sysfs.c b/net/core/net-sysfs.c
index f8f9430..8f8b7b6 100644
--- a/net/core/net-sysfs.c
+++ b/net/core/net-sysfs.c
@@ -1747,20 +1747,16 @@ int netdev_register_kobject(struct net_device *ndev)
 
 	error = device_add(dev);
 	if (error)
-		goto error_put_device;
+		return error;
 
 	error = register_queue_kobjects(ndev);
-	if (error)
-		goto error_device_del;
+	if (error) {
+		device_del(dev);
+		return error;
+	}
 
 	pm_runtime_set_memalloc_noio(dev, true);
 
-	return 0;
-
-error_device_del:
-	device_del(dev);
-error_put_device:
-	put_device(dev);
 	return error;
 }
 
-- 
1.8.3.1