1From c91f1d05c65526fe250cf5e5c32f9038721bc1d5 Mon Sep 17 00:00:00 2001 2From: yangchen <yangchen145@huawei.com> 3Date: Mon, 25 Dec 2023 12:39:56 +0800 4Subject: [PATCH] tcp_send_fin: add the fin to the last unsent segment 5 6--- 7 src/core/tcp_out.c | 4 ++-- 8 1 file changed, 2 insertions(+), 2 deletions(-) 9 10diff --git a/src/core/tcp_out.c b/src/core/tcp_out.c 11index 137e3cf..e5c407e 100644 12--- a/src/core/tcp_out.c 13+++ b/src/core/tcp_out.c 14@@ -1195,8 +1195,8 @@ tcp_send_fin(struct tcp_pcb *pcb) 15 LWIP_ASSERT("tcp_send_fin: invalid pcb", pcb != NULL); 16 17 /* first, try to add the fin to the last unsent segment */ 18- if (pcb->unsent != NULL) { 19- struct tcp_seg *last_unsent = pcb->unsent; 20+ if (pcb->last_unsent != NULL) { 21+ struct tcp_seg *last_unsent = pcb->last_unsent; 22 23 if ((TCPH_FLAGS(last_unsent->tcphdr) & (TCP_SYN | TCP_FIN | TCP_RST)) == 0) { 24 /* no SYN/FIN/RST flag in the header, we can add the FIN flag */ 25-- 262.33.0 27 28