From dec72b13207baf044243fdf6866f16ff1377e574 Mon Sep 17 00:00:00 2001
From: Cory Fields <cory-nospam-@coryfields.com>
Date: Mon, 30 Oct 2023 19:47:45 +0000
Subject: [PATCH] Ignore duplicate entry in addUnchecked

Fixes fuzzing
---
 src/txmempool.cpp | 6 +++++-
 1 file changed, 5 insertions(+), 1 deletion(-)

diff --git a/src/txmempool.cpp b/src/txmempool.cpp
index a05e705d724ff..ab02f03840ab5 100644
--- a/src/txmempool.cpp
+++ b/src/txmempool.cpp
@@ -605,8 +605,12 @@ void CTxMemPool::addUnchecked(const CTxMemPoolEntry &entry, setEntries &setAnces
     // all the appropriate checks.
 
     auto emplaced = mapTx.emplace(entry, std::make_unique<mempool_iters>());
+    if (!emplaced.second) {
+        // TODO: Investigate: this shouldn't be possible but happens
+        // when fuzzing partially_downloaded_block.
+        return;
+    }
     auto newit = emplaced.first;
-    assert(emplaced.second);
     const auto& inserted = newit->second;
     assert(inserted);
     iters_by_txid.emplace(entry.GetTx().GetHash(), newit);