mptcp: initialize the data_fin field for mpc packets

When parsing MPC+data packets we set the dss field, so
we must also initialize the data_fin, or we can find stray
value there.

Fixes: 9a19371bf029 ("mptcp: fix data_fin handing in RX path")
Signed-off-by: Paolo Abeni <pabeni@redhat.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

diff --git a/net/mptcp/options.c b/net/mptcp/options.c
index 9486720..45497af 100644 (file)
--- a/net/mptcp/options.c
+++ b/net/mptcp/options.c
@@ -858,6 +858,7 @@ void mptcp_incoming_options(struct sock *sk, struct sk_buff *skb,
                        mpext->subflow_seq = 1;
                        mpext->dsn64 = 1;
                        mpext->mpc_map = 1;
+                       mpext->data_fin = 0;
                } else {
                        mpext->data_seq = mp_opt.data_seq;
                        mpext->subflow_seq = mp_opt.subflow_seq;