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| author | WANG Cong <xiyou.wangcong@gmail.com> | 2015-02-13 13:56:53 -0800 |
|---|---|---|
| committer | Ben Hutchings <ben@decadent.org.uk> | 2015-05-09 23:16:37 +0100 |
| commit | c9f412a4c739cb7eb2b6af845f97539d8d1fcf44 (patch) | |
| tree | 21daa91d955d46bacf78a8e7bfe511847f7f6eea /net | |
| parent | 8bcd64423836bad3638684677f6d740bc7c9297f (diff) | |
| download | lwn-c9f412a4c739cb7eb2b6af845f97539d8d1fcf44.tar.gz lwn-c9f412a4c739cb7eb2b6af845f97539d8d1fcf44.zip | |
rtnetlink: call ->dellink on failure when ->newlink exists
[ Upstream commit 7afb8886a05be68e376655539a064ec672de8a8e ]
Ignacy reported that when eth0 is down and add a vlan device
on top of it like:
ip link add link eth0 name eth0.1 up type vlan id 1
We will get a refcount leak:
unregister_netdevice: waiting for eth0.1 to become free. Usage count = 2
The problem is when rtnl_configure_link() fails in rtnl_newlink(),
we simply call unregister_device(), but for stacked device like vlan,
we almost do nothing when we unregister the upper device, more work
is done when we unregister the lower device, so call its ->dellink().
Reported-by: Ignacy Gawedzki <ignacy.gawedzki@green-communications.fr>
Signed-off-by: Cong Wang <xiyou.wangcong@gmail.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
Signed-off-by: Ben Hutchings <ben@decadent.org.uk>
Diffstat (limited to 'net')
| -rw-r--r-- | net/core/rtnetlink.c | 12 |
1 files changed, 10 insertions, 2 deletions
diff --git a/net/core/rtnetlink.c b/net/core/rtnetlink.c index 2c51dfbed5e6..5b412f0627c3 100644 --- a/net/core/rtnetlink.c +++ b/net/core/rtnetlink.c @@ -1860,8 +1860,16 @@ replay: goto out; err = rtnl_configure_link(dev, ifm); - if (err < 0) - unregister_netdevice(dev); + if (err < 0) { + if (ops->newlink) { + LIST_HEAD(list_kill); + + ops->dellink(dev, &list_kill); + unregister_netdevice_many(&list_kill); + } else { + unregister_netdevice(dev); + } + } out: put_net(dest_net); return err; |