validate input before calling evm

core/state_transition.go

@@ -249,6 +249,10 @@ func (st *StateTransition) TransitionDb() (ret []byte, usedGas uint64, failed bo
 		} else {
 			to = st.to()
 		}
+		//if input is empty for the smart contract call, return
+		if len(data) == 0 {
+			return nil, new(big.Int), new(big.Int), false, nil
+		}
 		ret, st.gas, vmerr = evm.Call(sender, to, data, st.gas, st.value)
 	}
 	if vmerr != nil {