From 9664d775ef524602516bf87c32a1c485dca1ce68 Mon Sep 17 00:00:00 2001
From: Jared Wasinger <j-wasinger@hotmail.com>
Date: Mon, 30 Jul 2018 15:22:27 -0700
Subject: [PATCH] add EXTCODEHASH rules for nonexistent accounts and
 precompiles

---
 lib/opFns.js | 23 +++++++++++++++++++----
 1 file changed, 19 insertions(+), 4 deletions(-)

diff --git a/lib/opFns.js b/lib/opFns.js
index 20e1cd82814..6e6c21dd70d 100644
--- a/lib/opFns.js
+++ b/lib/opFns.js
@@ -291,13 +291,28 @@ module.exports = {
   EXTCODEHASH: function (address, runState, cb) {
     var stateManager = runState.stateManager
     address = addressToBuffer(address)
-    stateManager.getContractCode(address, function (err, code) {
+
+    if (runState._precompiled[address.toString('hex')]) {
+      cb(null, new BN(0))
+      return
+    }
+
+    stateManager.exists(address, function (err, exists) {
       if (err) return cb(err)
-      if (code.length == 0) {
-        cb(null, new BN(Buffer.from(utils.KECCAK256_NULL_S, 'hex')))
+      if (!exists) {
+        cb(null, new BN(0))
+        return
       }
 
-      cb(null, new BN(utils.keccak256(code)))
+      stateManager.getContractCode(address, function (err, code) {
+        if (err) return cb(err)
+        if (code.length === 0) {
+          cb(null, new BN(Buffer.from(utils.KECCAK256_NULL_S, 'hex')))
+          return
+        }
+
+        cb(null, new BN(utils.keccak256(code)))
+      })
     })
   },
   RETURNDATASIZE: function (runState) {