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dlci: acquire rtnl_lock before calling __dev_get_by_name()
commit 11eb264 upstream. Otherwise the net device returned can be freed at anytime. Signed-off-by: Li Zefan <lizefan@huawei.com> Signed-off-by: David S. Miller <davem@davemloft.net> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
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