Add SB Curated (copied from the smartbugs repository).

dataset/reentrancy/reentrancy_simple.sol

@@ -0,0 +1,29 @@
+/*
+ * @source: https://github.com/trailofbits/not-so-smart-contracts/blob/master/reentrancy/Reentrancy.sol
+ * @author: -
+ * @vulnerable_at_lines: 24
+ */
+
+ pragma solidity ^0.4.15;
+
+ contract Reentrance {
+     mapping (address => uint) userBalance;
+
+     function getBalance(address u) constant returns(uint){
+         return userBalance[u];
+     }
+
+     function addToBalance() payable{
+         userBalance[msg.sender] += msg.value;
+     }
+
+     function withdrawBalance(){
+         // send userBalance[msg.sender] ethers to msg.sender
+         // if mgs.sender is a contract, it will call its fallback function
+         // <yes> <report> REENTRANCY
+         if( ! (msg.sender.call.value(userBalance[msg.sender])() ) ){
+             throw;
+         }
+         userBalance[msg.sender] = 0;
+     }
+ }