From dba483ac69878f5f8aa3acbad31eba7aa65528fb Mon Sep 17 00:00:00 2001
From: Jonathan Hui <jonhui@google.com>
Date: Tue, 5 Aug 2025 15:51:25 -0700
Subject: [PATCH] [tcp] skip checksum validation during fuzz tests (#11789)

---
 src/core/net/tcp6.cpp | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/src/core/net/tcp6.cpp b/src/core/net/tcp6.cpp
index 204021583..f3f707acf 100644
--- a/src/core/net/tcp6.cpp
+++ b/src/core/net/tcp6.cpp
@@ -640,7 +640,9 @@ Error Tcp::HandleMessage(ot::Ip6::Header &aIp6Header, Message &aMessage, Message
     VerifyOrExit(headerSize >= sizeof(struct tcphdr) && headerSize <= sizeof(header) &&
                      static_cast<uint16_t>(headerSize) <= length,
                  error = kErrorParse);
+#ifndef FUZZING_BUILD_MODE_UNSAFE_FOR_PRODUCTION
     SuccessOrExit(error = Checksum::VerifyMessageChecksum(aMessage, aMessageInfo, kProtoTcp));
+#endif
     SuccessOrExit(error = aMessage.Read(aMessage.GetOffset(), &header[0], headerSize));
 
     ip6Header = reinterpret_cast<struct ip6_hdr *>(&aIp6Header);