Merge bitcoin/bitcoin#25683: refactor: log `nEvicted` message in `LimitOrphans` then return void

b4b657ba57a2ce31b3c21ea9245aad26d5b06a57 refactor: log `nEvicted` message in `LimitOrphans` then return void (chinggg)

Pull request description:

  Fix https://bugs.chromium.org/p/oss-fuzz/issues/detail?id=49347

  LimitOrphans() can log expired tx and it should log evicted tx as well instead of returning the `nEvicted` number for caller to print the message.
  Since `LimitOrphans()` now returns void, the redundant assertion check in fuzz test is also removed.

Top commit has no ACKs.

Tree-SHA512: 18c41702321b0e59812590cd389f3163831d431f4ebdc3b3e1e0698496a6bdbac52288f28f779237a58813c6717da1a35e8933d509822978ff726c1b13cfc778

4 files changed, 5 insertions, 10 deletions

diff --git a/src/net_processing.cpp b/src/net_processing.cpp
index 7507b8ebca..0e10fa5f9d 100644
--- a/src/net_processing.cpp
+++ b/src/net_processing.cpp
@@ -3631,10 +3631,7 @@ void PeerManagerImpl::ProcessMessage(CNode& pfrom, const std::string& msg_type,
 
                 // DoS prevention: do not allow m_orphanage to grow unbounded (see CVE-2012-3789)
                 unsigned int nMaxOrphanTx = (unsigned int)std::max((int64_t)0, gArgs.GetIntArg("-maxorphantx", DEFAULT_MAX_ORPHAN_TRANSACTIONS));
-                unsigned int nEvicted = m_orphanage.LimitOrphans(nMaxOrphanTx);
-                if (nEvicted > 0) {
-                    LogPrint(BCLog::MEMPOOL, "orphanage overflow, removed %u tx\n", nEvicted);
-                }
+                m_orphanage.LimitOrphans(nMaxOrphanTx);
             } else {
                 LogPrint(BCLog::MEMPOOL, "not keeping orphan with rejected parents %s\n",tx.GetHash().ToString());
                 // We will continue to reject this tx since it has rejected
diff --git a/src/test/fuzz/txorphan.cpp b/src/test/fuzz/txorphan.cpp
index 3fc6cde84e..7580651371 100644
--- a/src/test/fuzz/txorphan.cpp
+++ b/src/test/fuzz/txorphan.cpp
@@ -138,10 +138,8 @@ FUZZ_TARGET_INIT(txorphan, initialize_orphanage)
                 [&] {
                     // test mocktime and expiry
                     SetMockTime(ConsumeTime(fuzzed_data_provider));
-                    auto size_before = orphanage.Size();
                     auto limit = fuzzed_data_provider.ConsumeIntegral<unsigned int>();
-                    auto n_evicted = WITH_LOCK(g_cs_orphans, return orphanage.LimitOrphans(limit));
-                    Assert(size_before - n_evicted <= limit);
+                    WITH_LOCK(g_cs_orphans, orphanage.LimitOrphans(limit));
                     Assert(orphanage.Size() <= limit);
                 });
         }
diff --git a/src/txorphanage.cpp b/src/txorphanage.cpp
index ed4783f1a5..69ae8ea582 100644
--- a/src/txorphanage.cpp
+++ b/src/txorphanage.cpp
@@ -102,7 +102,7 @@ void TxOrphanage::EraseForPeer(NodeId peer)
     if (nErased > 0) LogPrint(BCLog::MEMPOOL, "Erased %d orphan tx from peer=%d\n", nErased, peer);
 }
 
-unsigned int TxOrphanage::LimitOrphans(unsigned int max_orphans)
+void TxOrphanage::LimitOrphans(unsigned int max_orphans)
 {
     AssertLockHeld(g_cs_orphans);
 
@@ -135,7 +135,7 @@ unsigned int TxOrphanage::LimitOrphans(unsigned int max_orphans)
         EraseTx(m_orphan_list[randompos]->first);
         ++nEvicted;
     }
-    return nEvicted;
+    if (nEvicted > 0) LogPrint(BCLog::MEMPOOL, "orphanage overflow, removed %u tx\n", nEvicted);
 }
 
 void TxOrphanage::AddChildrenToWorkSet(const CTransaction& tx, std::set<uint256>& orphan_work_set) const
diff --git a/src/txorphanage.h b/src/txorphanage.h
index 24c8318f36..9363e6f733 100644
--- a/src/txorphanage.h
+++ b/src/txorphanage.h
@@ -41,7 +41,7 @@ public:
     void EraseForBlock(const CBlock& block) LOCKS_EXCLUDED(::g_cs_orphans);
 
     /** Limit the orphanage to the given maximum */
-    unsigned int LimitOrphans(unsigned int max_orphans) EXCLUSIVE_LOCKS_REQUIRED(g_cs_orphans);
+    void LimitOrphans(unsigned int max_orphans) EXCLUSIVE_LOCKS_REQUIRED(g_cs_orphans);
 
     /** Add any orphans that list a particular tx as a parent into a peer's work set
      * (ie orphans that may have found their final missing parent, and so should be reconsidered for the mempool) */