diff options
Diffstat (limited to 'net/mptcp')
| -rw-r--r-- | net/mptcp/options.c | 9 |
1 files changed, 6 insertions, 3 deletions
diff --git a/net/mptcp/options.c b/net/mptcp/options.c index b4458ecd01f8..7fa822b55c34 100644 --- a/net/mptcp/options.c +++ b/net/mptcp/options.c @@ -868,15 +868,18 @@ void mptcp_incoming_options(struct sock *sk, struct sk_buff *skb, if (mp_opt.use_ack) update_una(msk, &mp_opt); - /* Zero-length packets, like bare ACKs carrying a DATA_FIN, are - * dropped by the caller and not propagated to the MPTCP layer. - * Copy the DATA_FIN information now. + /* Zero-data-length packets are dropped by the caller and not + * propagated to the MPTCP layer, so the skb extension does not + * need to be allocated or populated. DATA_FIN information, if + * present, needs to be updated here before the skb is freed. */ if (TCP_SKB_CB(skb)->seq == TCP_SKB_CB(skb)->end_seq) { if (mp_opt.data_fin && mp_opt.data_len == 1 && mptcp_update_rcv_data_fin(msk, mp_opt.data_seq) && schedule_work(&msk->work)) sock_hold(subflow->conn); + + return; } mpext = skb_ext_add(skb, SKB_EXT_MPTCP); |