fix block 299804 problem

nimbus/vm/computation.nim

@@ -182,7 +182,7 @@ proc applyMessage(computation: var BaseComputation, opCode: static[Op]) =
       debug "applyMessageAux failed", msg = computation.error.info
       return
 
-  if computation.gasMeter.gasRemaining <= 0:
+  if computation.gasMeter.gasRemaining < 0:
     snapshot.commit()
     return
 

nimbus/vm/interpreter/opcodes_impl.nim

@@ -700,6 +700,9 @@ template genCall(callName: untyped, opCode: Op): untyped =
                                  else:
                                     (memOutPos, memOutLen)
 
+    if gas > high(GasInt).u256:
+      raise newException(TypeError, "GasInt Overflow (" & callName.astToStr & ")")
+
     let (childGasFee, childGasLimit) = computation.gasCosts[opCode].c_handler(
       value,
       GasParams(kind: Call,
@@ -742,6 +745,8 @@ template genCall(callName: untyped, opCode: Op): untyped =
 
     if sender != ZERO_ADDRESS:
       childMsg.sender = sender
+    else:
+      childMsg.sender = computation.msg.storageAddress
       
     if opCode == CallCode:      
       childMsg.storageAddress = computation.msg.storageAddress