From 12a4c16840e6b5bfe5f1f92b0c62610a4a6cbe25 Mon Sep 17 00:00:00 2001
From: fudongbai <296179868@qq.com>
Date: Wed, 27 May 2020 17:35:51 +0800
Subject: [PATCH] fix gov hub do not well handle when the target account is not
 contract

---
 contracts/GovHub.sol      | 10 ++++++++++
 contracts/GovHub.template | 10 ++++++++++
 genesis.json              |  2 +-
 test/GovHub.js            | 15 +++++++++++++++
 4 files changed, 36 insertions(+), 1 deletion(-)

diff --git a/contracts/GovHub.sol b/contracts/GovHub.sol
index 3091c95a..c15b19ff 100644
--- a/contracts/GovHub.sol
+++ b/contracts/GovHub.sol
@@ -82,6 +82,10 @@ contract GovHub is System{
         if (target == address(this)){
             updateParam(key, value);
         }else{
+            if (!isContract(target)){
+                emit failReasonWithStr("the target is not a contract");
+                return;
+            }
             try IParamSubscriber(target).updateParam(key, value){
             }catch Error(string memory reason) {
                 emit failReasonWithStr(reason);
@@ -110,4 +114,10 @@ contract GovHub is System{
             emit failReasonWithStr("unknown param");
         }
     }
+
+    function isContract(address addr) internal view returns (bool) {
+        uint size;
+        assembly { size := extcodesize(addr) }
+        return size > 0;
+    }
 }
diff --git a/contracts/GovHub.template b/contracts/GovHub.template
index e0a35991..8f20de43 100644
--- a/contracts/GovHub.template
+++ b/contracts/GovHub.template
@@ -83,6 +83,10 @@ contract GovHub is System{
         if (target == address(this)){
             updateParam(key, value);
         }else{
+            if (!isContract(target)){
+                emit failReasonWithStr("the target is not a contract");
+                return;
+            }
             try IParamSubscriber(target).updateParam(key, value){
             }catch Error(string memory reason) {
                 emit failReasonWithStr(reason);
@@ -111,4 +115,10 @@ contract GovHub is System{
             emit failReasonWithStr("unknown param");
         }
     }
+
+    function isContract(address addr) internal view returns (bool) {
+        uint size;
+        assembly { size := extcodesize(addr) }
+        return size > 0;
+    }
 }
diff --git a/genesis.json b/genesis.json
index c5578168..6f5b7289 100644
--- a/genesis.json
+++ b/genesis.json
@@ -57,7 +57,7 @@
     },
     "0x0000000000000000000000000000000000001007": {
       "balance": "0x0",
-      "code": "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+      "code": 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     },
     "9fB29AAc15b9A4B7F17c3385939b007540f4d791": {
       "balance": "0x21e19e0c9bab2400000"
diff --git a/test/GovHub.js b/test/GovHub.js
index 0363189d..564d269f 100644
--- a/test/GovHub.js
+++ b/test/GovHub.js
@@ -132,6 +132,7 @@ contract('GovHub others', (accounts) => {
     it('Gov others failed', async () => {
         const govHubInstance = await GovHub.deployed();
         const bSCValidatorSetInstance =await BSCValidatorSet.deployed();
+        const systemRewardInstance = await SystemReward.deployed();
         const relayerAccount = accounts[8];
 
 
@@ -158,6 +159,20 @@ contract('GovHub others', (accounts) => {
             return ev.message === "length of relayerReward mismatch";
         });
         truffleAssert.eventNotEmitted(tx, "paramChange")
+
+        // address do not exist
+        tx = await govHubInstance.handlePackage(serialize("0x00","relayerReward", "0x0000000000000000000000000000000000000000000000000000000000000000", "0x1110000000000000000000000000000000001004"),crypto.randomBytes(32),100, 4,
+            {from: relayerAccount});
+        truffleAssert.eventEmitted(tx, "failReasonWithStr",(ev) => {
+            return ev.message === "the target is not a contract";
+        });
+
+        // method do no exist
+        tx = await govHubInstance.handlePackage(serialize("0x00","relayerReward", "0x0000000000000000000000000000000000000000000000000000000000000000", systemRewardInstance.address),crypto.randomBytes(32),100, 5,
+            {from: relayerAccount});
+        truffleAssert.eventEmitted(tx, "failReasonWithBytes",(ev) => {
+            return ev.message === null;
+        });
     });
 
 });