Merge #10760: Avoid dereference-of-casted-pointer

0aadc11fd Avoid dereference-of-casted-pointer (Pieter Wuille)

Pull request description:

  And prefer a static_cast to the intended reference type.

Tree-SHA512: e83b20023a4dca6029b46f7040a8a6fd54e1b42112ec0c87c3c3b567ed641de97a9e2335b57a2efb075491f641e5b977bc226a474276bea0c3c3c71d8d6ac54d

8 files changed, 26 insertions, 18 deletions

diff --git a/src/core_memusage.h b/src/core_memusage.h
index e4ccd54c42..f038e7b154 100644
--- a/src/core_memusage.h
+++ b/src/core_memusage.h
@@ -10,7 +10,7 @@
 #include "memusage.h"
 
 static inline size_t RecursiveDynamicUsage(const CScript& script) {
-    return memusage::DynamicUsage(*static_cast<const CScriptBase*>(&script));
+    return memusage::DynamicUsage(script);
 }
 
 static inline size_t RecursiveDynamicUsage(const COutPoint& out) {
diff --git a/src/primitives/transaction.h b/src/primitives/transaction.h
index f1dd51b9fd..041034bb8b 100644
--- a/src/primitives/transaction.h
+++ b/src/primitives/transaction.h
@@ -106,7 +106,7 @@ public:
     template <typename Stream, typename Operation>
     inline void SerializationOp(Stream& s, Operation ser_action) {
         READWRITE(prevout);
-        READWRITE(*(CScriptBase*)(&scriptSig));
+        READWRITE(scriptSig);
         READWRITE(nSequence);
     }
 
@@ -146,7 +146,7 @@ public:
     template <typename Stream, typename Operation>
     inline void SerializationOp(Stream& s, Operation ser_action) {
         READWRITE(nValue);
-        READWRITE(*(CScriptBase*)(&scriptPubKey));
+        READWRITE(scriptPubKey);
     }
 
     void SetNull()
diff --git a/src/rpc/blockchain.cpp b/src/rpc/blockchain.cpp
index c17ca2fa3a..6178a1c7ab 100644
--- a/src/rpc/blockchain.cpp
+++ b/src/rpc/blockchain.cpp
@@ -798,7 +798,7 @@ static void ApplyStats(CCoinsStats &stats, CHashWriter& ss, const uint256& hash,
     stats.nTransactions++;
     for (const auto output : outputs) {
         ss << VARINT(output.first + 1);
-        ss << *(const CScriptBase*)(&output.second.out.scriptPubKey);
+        ss << output.second.out.scriptPubKey;
         ss << VARINT(output.second.out.nValue);
         stats.nTransactionOutputs++;
         stats.nTotalAmount += output.second.out.nValue;
diff --git a/src/script/interpreter.cpp b/src/script/interpreter.cpp
index 7149c938fc..8a121774a0 100644
--- a/src/script/interpreter.cpp
+++ b/src/script/interpreter.cpp
@@ -1099,7 +1099,7 @@ public:
         // Serialize the script
         if (nInput != nIn)
             // Blank out other inputs' signatures
-            ::Serialize(s, CScriptBase());
+            ::Serialize(s, CScript());
         else
             SerializeScriptCode(s);
         // Serialize the nSequence
@@ -1207,7 +1207,7 @@ uint256 SignatureHash(const CScript& scriptCode, const CTransaction& txTo, unsig
         // The prevout may already be contained in hashPrevout, and the nSequence
         // may already be contain in hashSequence.
         ss << txTo.vin[nIn].prevout;
-        ss << static_cast<const CScriptBase&>(scriptCode);
+        ss << scriptCode;
         ss << amount;
         ss << txTo.vin[nIn].nSequence;
         // Outputs (none/one/all, depending on flags)
diff --git a/src/script/script.h b/src/script/script.h
index bbb37f049e..d16bfd0e00 100644
--- a/src/script/script.h
+++ b/src/script/script.h
@@ -8,6 +8,7 @@
 
 #include "crypto/common.h"
 #include "prevector.h"
+#include "serialize.h"
 
 #include <assert.h>
 #include <climits>
@@ -404,6 +405,13 @@ public:
     CScript(std::vector<unsigned char>::const_iterator pbegin, std::vector<unsigned char>::const_iterator pend) : CScriptBase(pbegin, pend) { }
     CScript(const unsigned char* pbegin, const unsigned char* pend) : CScriptBase(pbegin, pend) { }
 
+    ADD_SERIALIZE_METHODS;
+
+    template <typename Stream, typename Operation>
+    inline void SerializationOp(Stream& s, Operation ser_action) {
+        READWRITE(static_cast<CScriptBase&>(*this));
+    }
+
     CScript& operator+=(const CScript& b)
     {
         insert(end(), b.begin(), b.end());
diff --git a/src/test/dbwrapper_tests.cpp b/src/test/dbwrapper_tests.cpp
index be631ce7a6..093509e61c 100644
--- a/src/test/dbwrapper_tests.cpp
+++ b/src/test/dbwrapper_tests.cpp
@@ -95,7 +95,7 @@ BOOST_AUTO_TEST_CASE(dbwrapper_iterator)
         uint256 in2 = InsecureRand256();
         BOOST_CHECK(dbw.Write(key2, in2));
 
-        std::unique_ptr<CDBIterator> it(const_cast<CDBWrapper*>(&dbw)->NewIterator());
+        std::unique_ptr<CDBIterator> it(const_cast<CDBWrapper&>(dbw).NewIterator());
 
         // Be sure to seek past the obfuscation key (if it exists)
         it->Seek(key);
@@ -210,7 +210,7 @@ BOOST_AUTO_TEST_CASE(iterator_ordering)
         BOOST_CHECK(dbw.Write(key, value));
     }
 
-    std::unique_ptr<CDBIterator> it(const_cast<CDBWrapper*>(&dbw)->NewIterator());
+    std::unique_ptr<CDBIterator> it(const_cast<CDBWrapper&>(dbw).NewIterator());
     for (int c=0; c<2; ++c) {
         int seek_start;
         if (c == 0)
@@ -286,7 +286,7 @@ BOOST_AUTO_TEST_CASE(iterator_string_ordering)
         }
     }
 
-    std::unique_ptr<CDBIterator> it(const_cast<CDBWrapper*>(&dbw)->NewIterator());
+    std::unique_ptr<CDBIterator> it(const_cast<CDBWrapper&>(dbw).NewIterator());
     for (int c=0; c<2; ++c) {
         int seek_start;
         if (c == 0)
diff --git a/src/txdb.cpp b/src/txdb.cpp
index 002f6550bc..aa0b73a417 100644
--- a/src/txdb.cpp
+++ b/src/txdb.cpp
@@ -172,7 +172,7 @@ bool CBlockTreeDB::ReadLastBlockFile(int &nFile) {
 
 CCoinsViewCursor *CCoinsViewDB::Cursor() const
 {
-    CCoinsViewDBCursor *i = new CCoinsViewDBCursor(const_cast<CDBWrapper*>(&db)->NewIterator(), GetBestBlock());
+    CCoinsViewDBCursor *i = new CCoinsViewDBCursor(const_cast<CDBWrapper&>(db).NewIterator(), GetBestBlock());
     /* It seems that there are no "const iterators" for LevelDB.  Since we
        only need read operations on it, use a const-cast to get around
        that restriction.  */
diff --git a/src/wallet/walletdb.cpp b/src/wallet/walletdb.cpp
index 2a33dca240..65a28af46d 100644
--- a/src/wallet/walletdb.cpp
+++ b/src/wallet/walletdb.cpp
@@ -94,23 +94,23 @@ bool CWalletDB::WriteMasterKey(unsigned int nID, const CMasterKey& kMasterKey)
 
 bool CWalletDB::WriteCScript(const uint160& hash, const CScript& redeemScript)
 {
-    return WriteIC(std::make_pair(std::string("cscript"), hash), *(const CScriptBase*)(&redeemScript), false);
+    return WriteIC(std::make_pair(std::string("cscript"), hash), redeemScript, false);
 }
 
 bool CWalletDB::WriteWatchOnly(const CScript &dest, const CKeyMetadata& keyMeta)
 {
-    if (!WriteIC(std::make_pair(std::string("watchmeta"), *(const CScriptBase*)(&dest)), keyMeta)) {
+    if (!WriteIC(std::make_pair(std::string("watchmeta"), dest), keyMeta)) {
         return false;
     }
-    return WriteIC(std::make_pair(std::string("watchs"), *(const CScriptBase*)(&dest)), '1');
+    return WriteIC(std::make_pair(std::string("watchs"), dest), '1');
 }
 
 bool CWalletDB::EraseWatchOnly(const CScript &dest)
 {
-    if (!EraseIC(std::make_pair(std::string("watchmeta"), *(const CScriptBase*)(&dest)))) {
+    if (!EraseIC(std::make_pair(std::string("watchmeta"), dest))) {
         return false;
     }
-    return EraseIC(std::make_pair(std::string("watchs"), *(const CScriptBase*)(&dest)));
+    return EraseIC(std::make_pair(std::string("watchs"), dest));
 }
 
 bool CWalletDB::WriteBestBlock(const CBlockLocator& locator)
@@ -323,7 +323,7 @@ ReadKeyValue(CWallet* pwallet, CDataStream& ssKey, CDataStream& ssValue,
         {
             wss.nWatchKeys++;
             CScript script;
-            ssKey >> *(CScriptBase*)(&script);
+            ssKey >> script;
             char fYes;
             ssValue >> fYes;
             if (fYes == '1')
@@ -440,7 +440,7 @@ ReadKeyValue(CWallet* pwallet, CDataStream& ssKey, CDataStream& ssValue,
             else if (strType == "watchmeta")
             {
               CScript script;
-              ssKey >> *(CScriptBase*)(&script);
+              ssKey >> script;
               keyID = CScriptID(script);
             }
 
@@ -474,7 +474,7 @@ ReadKeyValue(CWallet* pwallet, CDataStream& ssKey, CDataStream& ssValue,
             uint160 hash;
             ssKey >> hash;
             CScript script;
-            ssValue >> *(CScriptBase*)(&script);
+            ssValue >> script;
             if (!pwallet->LoadCScript(script))
             {
                 strErr = "Error reading wallet database: LoadCScript failed";