From 39f0d9686095bce469dbfa52333331a5d15c6545 Mon Sep 17 00:00:00 2001
From: Gavin Andresen <gavinandresen@gmail.com>
Date: Thu, 19 Jan 2012 13:30:54 -0500
Subject: Make transactions with extra data in their scriptSig's non-standard.

---
 src/main.cpp | 25 ++++++++++++++++++++-----
 1 file changed, 20 insertions(+), 5 deletions(-)

(limited to 'src/main.cpp')

diff --git a/src/main.cpp b/src/main.cpp
index 3c3f066042..db7977dfd8 100644
--- a/src/main.cpp
+++ b/src/main.cpp
@@ -293,18 +293,33 @@ bool CTransaction::AreInputsStandard(const MapPrevTx& mapInputs) const
         const CScript& prevScript = prev.scriptPubKey;
         if (!Solver(prevScript, whichType, vSolutions))
             return false;
+        int nArgsExpected = ScriptSigArgsExpected(whichType, vSolutions);
+
+        // Transactions with extra stuff in their scriptSigs are
+        // non-standard. Note that this EvalScript() call will
+        // be quick, because if there are any operations
+        // beside "push data" in the scriptSig the
+        // IsStandard() call returns false
+        vector<vector<unsigned char> > stack;
+        if (!EvalScript(stack, vin[i].scriptSig, *this, i, 0))
+            return false;
+
         if (whichType == TX_SCRIPTHASH)
         {
-            vector<vector<unsigned char> > stack;
-
-            if (!EvalScript(stack, vin[i].scriptSig, *this, i, 0))
-                return false;
             if (stack.empty())
                 return false;
             CScript subscript(stack.back().begin(), stack.back().end());
-            if (!::IsStandard(subscript))
+            vector<vector<unsigned char> > vSolutions2;
+            txnouttype whichType2;
+            if (!Solver(subscript, whichType2, vSolutions2))
                 return false;
+            if (whichType2 == TX_SCRIPTHASH)
+                return false;
+            nArgsExpected += ScriptSigArgsExpected(whichType2, vSolutions2);
         }
+
+        if (stack.size() != nArgsExpected)
+            return false;
     }
 
     return true;
-- 
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