Any options received on a fallback subflow should be ignored.

squashto: Implement MPTCP receive path

Signed-off-by: Peter Krystad <peter.krystad(a)linux.intel.com>
---
 net/mptcp/options.c | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/net/mptcp/options.c b/net/mptcp/options.c
index 8f199039971f..dcd7273e488c 100644
--- a/net/mptcp/options.c
+++ b/net/mptcp/options.c
@@ -591,6 +591,9 @@ void mptcp_incoming_options(struct sock *sk, struct sk_buff *skb,
 	struct mptcp_options_received *mp_opt;
 	struct mptcp_ext *mpext;
 
+	if (!subflow->mp_capable)
+		return;
+
 	mp_opt = &opt_rx->mptcp;
 
 	if (msk && mp_opt->add_addr) {
-- 
2.17.2