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| author | WANG Cong <xiyou.wangcong@gmail.com> | 2015-02-13 13:56:53 -0800 |
|---|---|---|
| committer | David S. Miller <davem@davemloft.net> | 2015-02-15 08:30:10 -0800 |
| commit | 7afb8886a05be68e376655539a064ec672de8a8e (patch) | |
| tree | 80a30b31cb6062fb572cfe748556a8974badf973 /net | |
| parent | d95e2fe0ffa3b4325ddd11095f46d0c0b96450f5 (diff) | |
| download | linux-7afb8886a05be68e376655539a064ec672de8a8e.tar.bz2 | |
rtnetlink: call ->dellink on failure when ->newlink exists
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>
Diffstat (limited to 'net')
| -rw-r--r-- | net/core/rtnetlink.c | 9 |
1 files changed, 8 insertions, 1 deletions
diff --git a/net/core/rtnetlink.c b/net/core/rtnetlink.c index 5be499b6a2d2..ab293a3066b3 100644 --- a/net/core/rtnetlink.c +++ b/net/core/rtnetlink.c @@ -2162,7 +2162,14 @@ replay: } err = rtnl_configure_link(dev, ifm); if (err < 0) { - unregister_netdevice(dev); + if (ops->newlink) { + LIST_HEAD(list_kill); + + ops->dellink(dev, &list_kill); + unregister_netdevice_many(&list_kill); + } else { + unregister_netdevice(dev); + } goto out; } |