net: lapbether: fix issue of dev reference count leakage in lapbeth_device_event()
When following tests are performed, it will cause dev reference counting leakage. a)ip link add bond2 type bond mode balance-rr b)ip link set bond2 up c)ifenslave -f bond2 rose1 d)ip link del bond2 When new bond device is created, the default type of the bond device is ether. And the bond device is up, lapbeth_device_event() receives the message and creates a new lapbeth device. In this case, the reference count value of dev is hold once. But after "ifenslave -f bond2 rose1" command is executed, the type of the bond device is changed to rose. When the bond device is unregistered, lapbeth_device_event() will not put the dev reference count. Fixes: 1da177e4 ("Linux-2.6.12-rc2") Signed-off-by: NZhengchao Shao <shaozhengchao@huawei.com> Signed-off-by: NDavid S. Miller <davem@davemloft.net>
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