Merge bitcoin#13437: wallet: Erase wtxOrderd wtx pointer on removeprunedfunds

faa18ca wallet: Erase wtxOrderd wtx pointer on removeprunedfunds (MarcoFalke)

Pull request description:

  This prevents segfaults, when reading from the freed memory.

Tree-SHA512: 04f8190dea7901cf1cc298d5db98c83b02858f27114c5ef4da738accd176d6647d6b81f3dc39f3d5912b1a981cf0599370fd391c4154ffbde97afc1fac389123

Author: laanwj

src/wallet/wallet.cpp

@@ -1063,11 +1063,10 @@ bool CWallet::AddToWallet(const CWalletTx& wtxIn, bool fFlushOnClose)
     CWalletTx& wtx = (*ret.first).second;
     wtx.BindWallet(this);
     bool fInsertedNew = ret.second;
-    if (fInsertedNew)
-    {
+    if (fInsertedNew) {
         wtx.nTimeReceived = GetAdjustedTime();
         wtx.nOrderPos = IncOrderPosNext(&walletdb);
-        wtxOrdered.insert(std::make_pair(wtx.nOrderPos, TxPair(&wtx, nullptr)));
+        wtx.m_it_wtxOrdered = wtxOrdered.insert(std::make_pair(wtx.nOrderPos, TxPair(&wtx, nullptr)));
         wtx.nTimeSmart = ComputeTimeSmart(wtx);
         AddToSpends(hash);
 
@@ -1141,9 +1140,12 @@ bool CWallet::AddToWallet(const CWalletTx& wtxIn, bool fFlushOnClose)
 bool CWallet::LoadToWallet(const CWalletTx& wtxIn)
 {
     uint256 hash = wtxIn.GetHash();
-    CWalletTx& wtx = mapWallet.emplace(hash, wtxIn).first->second;
+    const auto& ins = mapWallet.emplace(hash, wtxIn);
+    CWalletTx& wtx = ins.first->second;
     wtx.BindWallet(this);
-    wtxOrdered.insert(std::make_pair(wtx.nOrderPos, TxPair(&wtx, nullptr)));
+    if (/* insertion took place */ ins.second) {
+        wtx.m_it_wtxOrdered = wtxOrdered.insert(std::make_pair(wtx.nOrderPos, TxPair(&wtx, nullptr)));
+    }
     AddToSpends(hash);
     for (const CTxIn& txin : wtx.tx->vin) {
         auto it = mapWallet.find(txin.prevout.hash);
@@ -4172,8 +4174,11 @@ DBErrors CWallet::ZapSelectTx(std::vector<uint256>& vHashIn, std::vector<uint256
 {
     AssertLockHeld(cs_wallet); // mapWallet
     DBErrors nZapSelectTxRet = CWalletDB(*dbw,"cr+").ZapSelectTx(vHashIn, vHashOut);
-    for (uint256 hash : vHashOut)
-        mapWallet.erase(hash);
+    for (uint256 hash : vHashOut) {
+        const auto& it = mapWallet.find(hash);
+        wtxOrdered.erase(it->second.m_it_wtxOrdered);
+        mapWallet.erase(it);
+    }
 
     if (nZapSelectTxRet == DB_NEED_REWRITE)
     {

src/wallet/wallet.h

@@ -331,6 +331,7 @@ class CWalletTx : public CMerkleTx
     char fFromMe;
     std::string strFromAccount;
     int64_t nOrderPos; //!< position in ordered transaction list
+    std::multimap<int64_t, std::pair<CWalletTx*, CAccountingEntry*>>::const_iterator m_it_wtxOrdered;
 
     // memory only
     mutable bool fDebitCached;