From 64fb4066cfafbaf7157ad9bfca1e541d1a8ff76c Mon Sep 17 00:00:00 2001
From: Victor Julien <vjulien@oisf.net>
Date: Fri, 3 Mar 2023 13:30:55 +0100
Subject: [PATCH] stream: harden tcp reuse check against RST/FIN

---
 src/stream-tcp.c | 4 ++++
 1 file changed, 4 insertions(+)

diff --git a/src/stream-tcp.c b/src/stream-tcp.c
index 0524f8c618..013feac9a0 100644
--- a/src/stream-tcp.c
+++ b/src/stream-tcp.c
@@ -5493,6 +5493,10 @@ static inline int StreamTcpValidateChecksum(Packet *p)
  *  \retval bool true/false */
 static int TcpSessionPacketIsStreamStarter(const Packet *p)
 {
+    if (p->tcph->th_flags & (TH_RST | TH_FIN)) {
+        return 0;
+    }
+
     if ((p->tcph->th_flags & (TH_SYN | TH_ACK)) == TH_SYN) {
         SCLogDebug("packet %"PRIu64" is a stream starter: %02x", p->pcap_cnt, p->tcph->th_flags);
         return 1;