Merge pull request zcash#3401

012ca1c LoadWallet: acquire cs_wallet mutex before clearing setKeyPool (Wladimir J. van der Laan)
9569168 Document cs_wallet lock and add AssertLockHeld (Wladimir J. van der Laan)
19a5676 Use mutex pointer instead of name for AssertLockHeld (Wladimir J. van der Laan)

src/main.cpp

@@ -2235,7 +2235,7 @@ void PushGetBlocks(CNode* pnode, CBlockIndex* pindexBegin, uint256 hashEnd)
 
 bool ProcessBlock(CValidationState &state, CNode* pfrom, CBlock* pblock, CDiskBlockPos *dbp)
 {
-    AssertLockHeld("cs_main");
+    AssertLockHeld(cs_main);
 
     // Check for duplicate
     uint256 hash = pblock->GetHash();

src/sync.cpp

@@ -136,11 +136,11 @@ std::string LocksHeld()
     return result;
 }
 
-void AssertLockHeld(std::string strName)
+void AssertLockHeldInternal(const char *pszName, const char* pszFile, int nLine, void *cs)
 {
     BOOST_FOREACH(const PAIRTYPE(void*, CLockLocation)&i, *lockstack)
-        if (i.second.MutexName() == strName) return;
-    LogPrintf("Lock %s not held; locks held:\n%s", strName.c_str(), LocksHeld().c_str());
+        if (i.first == cs) return;
+    LogPrintf("Lock %s not held in %s:%i; locks held:\n%s", pszName, pszFile, nLine, LocksHeld().c_str());
     assert(0);
 }
 

src/sync.h

@@ -88,12 +88,13 @@ typedef AnnotatedMixin<boost::mutex> CWaitableCriticalSection;
 void EnterCritical(const char* pszName, const char* pszFile, int nLine, void* cs, bool fTry = false);
 void LeaveCritical();
 std::string LocksHeld();
-void AssertLockHeld(std::string strName);
+void AssertLockHeldInternal(const char* pszName, const char* pszFile, int nLine, void *cs);
 #else
 void static inline EnterCritical(const char* pszName, const char* pszFile, int nLine, void* cs, bool fTry = false) {}
 void static inline LeaveCritical() {}
-void static inline AssertLockHeld(std::string) {}
+void static inline AssertLockHeldInternal(const char* pszName, const char* pszFile, int nLine, void *cs) {}
 #endif
+#define AssertLockHeld(cs) AssertLockHeldInternal(#cs, __FILE__, __LINE__, &cs)
 
 #ifdef DEBUG_LOCKCONTENTION
 void PrintLockContention(const char* pszName, const char* pszFile, int nLine);

src/wallet.cpp

@@ -35,6 +35,7 @@ struct CompareValueOnly
 
 CPubKey CWallet::GenerateNewKey()
 {
+    AssertLockHeld(cs_wallet); // mapKeyMetadata
     bool fCompressed = CanSupportFeature(FEATURE_COMPRPUBKEY); // default to compressed public keys if we want 0.6.0 wallets
 
     RandAddSeedPerfmon();
@@ -60,6 +61,7 @@ CPubKey CWallet::GenerateNewKey()
 
 bool CWallet::AddKeyPubKey(const CKey& secret, const CPubKey &pubkey)
 {
+    AssertLockHeld(cs_wallet); // mapKeyMetadata
     if (!CCryptoKeyStore::AddKeyPubKey(secret, pubkey))
         return false;
     if (!fFileBacked)
@@ -95,6 +97,7 @@ bool CWallet::AddCryptedKey(const CPubKey &vchPubKey,
 
 bool CWallet::LoadKeyMetadata(const CPubKey &pubkey, const CKeyMetadata &meta)
 {
+    AssertLockHeld(cs_wallet); // mapKeyMetadata
     if (meta.nCreateTime && (!nTimeFirstKey || meta.nCreateTime < nTimeFirstKey))
         nTimeFirstKey = meta.nCreateTime;
 
@@ -202,6 +205,7 @@ class CCorruptAddress
 
 bool CWallet::SetMinVersion(enum WalletFeature nVersion, CWalletDB* pwalletdbIn, bool fExplicit)
 {
+    AssertLockHeld(cs_wallet); // nWalletVersion
     if (nWalletVersion >= nVersion)
         return true;
 
@@ -235,6 +239,7 @@ bool CWallet::SetMinVersion(enum WalletFeature nVersion, CWalletDB* pwalletdbIn,
 
 bool CWallet::SetMaxVersion(int nVersion)
 {
+    AssertLockHeld(cs_wallet); // nWalletVersion, nWalletMaxVersion
     // cannot downgrade below current version
     if (nWalletVersion > nVersion)
         return false;
@@ -327,6 +332,7 @@ bool CWallet::EncryptWallet(const SecureString& strWalletPassphrase)
 
 int64_t CWallet::IncOrderPosNext(CWalletDB *pwalletdb)
 {
+    AssertLockHeld(cs_wallet); // nOrderPosNext
     int64_t nRet = nOrderPosNext++;
     if (pwalletdb) {
         pwalletdb->WriteOrderPosNext(nOrderPosNext);
@@ -338,6 +344,7 @@ int64_t CWallet::IncOrderPosNext(CWalletDB *pwalletdb)
 
 CWallet::TxItems CWallet::OrderedTxItems(std::list<CAccountingEntry>& acentries, std::string strAccount)
 {
+    AssertLockHeld(cs_wallet); // mapWallet
     CWalletDB walletdb(strWalletFile);
 
     // First: get all CWalletTx and CAccountingEntry into a sorted-by-order multimap.
@@ -1492,6 +1499,7 @@ DBErrors CWallet::LoadWallet(bool& fFirstRunRet)
     {
         if (CDB::Rewrite(strWalletFile, "\x04pool"))
         {
+            LOCK(cs_wallet);
             setKeyPool.clear();
             // Note: can't top-up keypool here, because wallet is locked.
             // User will be prompted to unlock wallet the next operation
@@ -1509,6 +1517,7 @@ DBErrors CWallet::LoadWallet(bool& fFirstRunRet)
 
 bool CWallet::SetAddressBook(const CTxDestination& address, const string& strName, const string& strPurpose)
 {
+    AssertLockHeld(cs_wallet); // mapAddressBook
     std::map<CTxDestination, CAddressBookData>::iterator mi = mapAddressBook.find(address);
     mapAddressBook[address].name = strName;
     if (!strPurpose.empty()) /* update purpose only if requested */
@@ -1525,6 +1534,7 @@ bool CWallet::SetAddressBook(const CTxDestination& address, const string& strNam
 
 bool CWallet::DelAddressBook(const CTxDestination& address)
 {
+    AssertLockHeld(cs_wallet); // mapAddressBook
     mapAddressBook.erase(address);
     NotifyAddressBookChanged(this, address, "", ::IsMine(*this, address), "", CT_DELETED);
     if (!fFileBacked)
@@ -1738,6 +1748,7 @@ std::map<CTxDestination, int64_t> CWallet::GetAddressBalances()
 
 set< set<CTxDestination> > CWallet::GetAddressGroupings()
 {
+    AssertLockHeld(cs_wallet); // mapWallet
     set< set<CTxDestination> > groupings;
     set<CTxDestination> grouping;
 
@@ -1830,6 +1841,7 @@ set< set<CTxDestination> > CWallet::GetAddressGroupings()
 
 set<CTxDestination> CWallet::GetAccountAddresses(string strAccount) const
 {
+    AssertLockHeld(cs_wallet); // mapWallet
     set<CTxDestination> result;
     BOOST_FOREACH(const PAIRTYPE(CTxDestination, CAddressBookData)& item, mapAddressBook)
     {
@@ -1911,28 +1923,33 @@ void CWallet::UpdatedTransaction(const uint256 &hashTx)
 
 void CWallet::LockCoin(COutPoint& output)
 {
+    AssertLockHeld(cs_wallet); // setLockedCoins
     setLockedCoins.insert(output);
 }
 
 void CWallet::UnlockCoin(COutPoint& output)
 {
+    AssertLockHeld(cs_wallet); // setLockedCoins
     setLockedCoins.erase(output);
 }
 
 void CWallet::UnlockAllCoins()
 {
+    AssertLockHeld(cs_wallet); // setLockedCoins
     setLockedCoins.clear();
 }
 
 bool CWallet::IsLockedCoin(uint256 hash, unsigned int n) const
 {
+    AssertLockHeld(cs_wallet); // setLockedCoins
     COutPoint outpt(hash, n);
 
     return (setLockedCoins.count(outpt) > 0);
 }
 
 void CWallet::ListLockedCoins(std::vector<COutPoint>& vOutpts)
 {
+    AssertLockHeld(cs_wallet); // setLockedCoins
     for (std::set<COutPoint>::iterator it = setLockedCoins.begin();
          it != setLockedCoins.end(); it++) {
         COutPoint outpt = (*it);
@@ -1941,6 +1958,7 @@ void CWallet::ListLockedCoins(std::vector<COutPoint>& vOutpts)
 }
 
 void CWallet::GetKeyBirthTimes(std::map<CKeyID, int64_t> &mapKeyBirth) const {
+    AssertLockHeld(cs_wallet); // mapKeyMetadata
     mapKeyBirth.clear();
 
     // get birth times for keys with metadata

src/wallet.h

@@ -105,6 +105,11 @@ class CWallet : public CCryptoKeyStore, public CWalletInterface
     int64_t nLastResend;
 
 public:
+    /// Main wallet lock.
+    /// This lock protects all the fields added by CWallet
+    ///   except for:
+    ///      fFileBacked (immutable after instantiation)
+    ///      strWalletFile (immutable after instantiation)
     mutable CCriticalSection cs_wallet;
 
     bool fFileBacked;
@@ -154,10 +159,11 @@ class CWallet : public CCryptoKeyStore, public CWalletInterface
     int64_t nTimeFirstKey;
 
     // check whether we are allowed to upgrade (or already support) to the named feature
-    bool CanSupportFeature(enum WalletFeature wf) { return nWalletMaxVersion >= wf; }
+    bool CanSupportFeature(enum WalletFeature wf) { AssertLockHeld(cs_wallet); return nWalletMaxVersion >= wf; }
 
     void AvailableCoins(std::vector<COutput>& vCoins, bool fOnlyConfirmed=true, const CCoinControl *coinControl = NULL) const;
     bool SelectCoinsMinConf(int64_t nTargetValue, int nConfMine, int nConfTheirs, std::vector<COutput> vCoins, std::set<std::pair<const CWalletTx*,unsigned int> >& setCoinsRet, int64_t& nValueRet) const;
+
     bool IsLockedCoin(uint256 hash, unsigned int n) const;
     void LockCoin(COutPoint& output);
     void UnlockCoin(COutPoint& output);
@@ -174,7 +180,7 @@ class CWallet : public CCryptoKeyStore, public CWalletInterface
     // Load metadata (used by LoadWallet)
     bool LoadKeyMetadata(const CPubKey &pubkey, const CKeyMetadata &metadata);
 
-    bool LoadMinVersion(int nVersion) { nWalletVersion = nVersion; nWalletMaxVersion = std::max(nWalletMaxVersion, nVersion); return true; }
+    bool LoadMinVersion(int nVersion) { AssertLockHeld(cs_wallet); nWalletVersion = nVersion; nWalletMaxVersion = std::max(nWalletMaxVersion, nVersion); return true; }
 
     // Adds an encrypted key to the store, and saves it to disk.
     bool AddCryptedKey(const CPubKey &vchPubKey, const std::vector<unsigned char> &vchCryptedSecret);
@@ -323,6 +329,7 @@ class CWallet : public CCryptoKeyStore, public CWalletInterface
 
     unsigned int GetKeyPoolSize()
     {
+        AssertLockHeld(cs_wallet); // setKeyPool
         return setKeyPool.size();
     }
 
@@ -335,7 +342,7 @@ class CWallet : public CCryptoKeyStore, public CWalletInterface
     bool SetMaxVersion(int nVersion);
 
     // get the current wallet format (the oldest client version guaranteed to understand this wallet)
-    int GetVersion() { return nWalletVersion; }
+    int GetVersion() { AssertLockHeld(cs_wallet); return nWalletVersion; }
 
     /** Address book entry changed.
      * @note called with lock cs_wallet held.