l2tp: take a reference for kernel sockets in l2tp_tunnel_sock_lookup
When looking up the tunnel socket in struct l2tp_tunnel, hold a reference whether the socket was created by the kernel or by userspace. Signed-off-by: Tom Parkin <tparkin@katalix.com> Signed-off-by: James Chapman <jchapman@katalix.com> Signed-off-by: David S. Miller <davem@davemloft.net>
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