add onlyFirstCall modifier

ethereum-optimism · Jan 10, 2021 · 9758ca1 · 9758ca1
1 parent 5886e76
commit 9758ca1
Showing 1 changed file with 8 additions and 0 deletions.
diff --git a/contracts/optimistic-ethereum/OVM/bridge/OVM_L2CrossDomainMessenger.sol b/contracts/optimistic-ethereum/OVM/bridge/OVM_L2CrossDomainMessenger.sol
@@ -36,6 +36,13 @@ contract OVM_L2CrossDomainMessenger is iOVM_L2CrossDomainMessenger, OVM_BaseCros
         Lib_AddressResolver(_libAddressManager)
     {}
 
+    modifier onlyFirstCall() {
+        require(
+                msg.sender == address(0),
+                "Only callable during the first call of transaction"
+            );
+        _;
+    }
 
     /********************
      * Public Functions *
@@ -53,6 +60,7 @@ contract OVM_L2CrossDomainMessenger is iOVM_L2CrossDomainMessenger, OVM_BaseCros
     )
         override
         nonReentrant
+        onlyFirstCall
         public
     {
         require(