From 14c8565676b99eb41fb8deb15bb617a8cf883191 Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Antonio=20S=C3=A1nchez?= <asanchez@plutec.net>
Date: Thu, 17 Feb 2022 16:54:41 +0100
Subject: [PATCH] Preventing problems with segments out of order

---
 scapy/sessions.py | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/scapy/sessions.py b/scapy/sessions.py
index 62be34ec97d..30969499bec 100644
--- a/scapy/sessions.py
+++ b/scapy/sessions.py
@@ -308,6 +308,9 @@ def _process_packet(self, pkt):
         if relative_seq is None:
             relative_seq = metadata["relative_seq"] = seq - 1
         seq = seq - relative_seq
+        # If the seq < 0 means the segment is out of order
+        if seq < 0:
+            return None
         # Add the data to the buffer
         # Note that this take care of retransmission packets.
         data.append(new_data, seq)