Vote on IS only if it was accepted to mempool

src/instantx.cpp

@@ -122,15 +122,11 @@ bool CInstantSend::ProcessTxLockRequest(const CTxLockRequest& txLockRequest, CCo
     }
     LogPrintf("CInstantSend::ProcessTxLockRequest -- accepted, txid=%s\n", txHash.ToString());
 
-    std::map<uint256, CTxLockCandidate>::iterator itLockCandidate = mapTxLockCandidates.find(txHash);
-    CTxLockCandidate& txLockCandidate = itLockCandidate->second;
-    Vote(txLockCandidate, connman);
-    ProcessOrphanTxLockVotes(connman);
-
     // Masternodes will sometimes propagate votes before the transaction is known to the client.
     // If this just happened - lock inputs, resolve conflicting locks, update transaction status
     // forcing external script notification.
-    TryToFinalizeLockCandidate(txLockCandidate);
+    std::map<uint256, CTxLockCandidate>::iterator itLockCandidate = mapTxLockCandidates.find(txHash);
+    TryToFinalizeLockCandidate(itLockCandidate->second);
 
     return true;
 }
@@ -182,6 +178,18 @@ void CInstantSend::CreateEmptyTxLockCandidate(const uint256& txHash)
     mapTxLockCandidates.insert(std::make_pair(txHash, CTxLockCandidate(txLockRequest)));
 }
 
+void CInstantSend::Vote(const uint256& txHash, CConnman& connman)
+{
+    AssertLockHeld(cs_main);
+    LOCK(cs_instantsend);
+
+    std::map<uint256, CTxLockCandidate>::iterator itLockCandidate = mapTxLockCandidates.find(txHash);
+    if (itLockCandidate == mapTxLockCandidates.end()) return;
+    Vote(itLockCandidate->second, connman);
+    // Let's see if our vote changed smth
+    TryToFinalizeLockCandidate(itLockCandidate->second);
+}
+
 void CInstantSend::Vote(CTxLockCandidate& txLockCandidate, CConnman& connman)
 {
     if(!fMasterNode) return;
@@ -190,6 +198,8 @@ void CInstantSend::Vote(CTxLockCandidate& txLockCandidate, CConnman& connman)
     LOCK2(cs_main, cs_instantsend);
 
     uint256 txHash = txLockCandidate.GetHash();
+    // We should never vote on a Transaction Lock Request that was not (yet) accepted by the mempool
+    if(mapLockRequestAccepted.find(txHash) == mapLockRequestAccepted.end()) return;
     // check if we need to vote on this candidate's outpoints,
     // it's possible that we need to vote for several of them
     std::map<COutPoint, COutPointLock>::iterator itOutpointLock = txLockCandidate.mapOutPointLocks.begin();

src/instantx.h

@@ -86,6 +86,7 @@ class CInstantSend
     void ProcessMessage(CNode* pfrom, std::string& strCommand, CDataStream& vRecv, CConnman& connman);
 
     bool ProcessTxLockRequest(const CTxLockRequest& txLockRequest, CConnman& connman);
+    void Vote(const uint256& txHash, CConnman& connman);
 
     bool AlreadyHave(const uint256& hash);
 

src/net_processing.cpp

@@ -1659,6 +1659,7 @@ bool static ProcessMessage(CNode* pfrom, string strCommand, CDataStream& vRecv,
                 LogPrintf("TXLOCKREQUEST -- Transaction Lock Request accepted, txid=%s, peer=%d\n",
                         tx.GetHash().ToString(), pfrom->id);
                 instantsend.AcceptLockRequest(txLockRequest);
+                instantsend.Vote(tx.GetHash(), connman);
             }
 
             mempool.check(pcoinsTip);