From da9581f6431f0ed8f2f6cecbf647141e66d7f0f7 Mon Sep 17 00:00:00 2001
From: Sowmayjain <champ.sowmay@gmail.com>
Date: Sat, 1 Dec 2018 16:40:51 +0530
Subject: [PATCH] Fixed a very vulnerable bug.

---
 contracts/protocols/InstaMaker.sol | 1 +
 1 file changed, 1 insertion(+)

diff --git a/contracts/protocols/InstaMaker.sol b/contracts/protocols/InstaMaker.sol
index 6601f06..a8eb119 100644
--- a/contracts/protocols/InstaMaker.sol
+++ b/contracts/protocols/InstaMaker.sol
@@ -240,6 +240,7 @@ contract BorrowTasks is RepayLoan {
         bytes32 cdpBytes = bytes32(cdpNum);
         MakerCDP loanMaster = MakerCDP(cdpAddr);
         address cdpOwner = loanMaster.lad(cdpBytes);
+        require(cdps[cdpOwner] == blankCDP, "More than 1 CDP is not allowed.");
         cdps[cdpOwner] = cdpBytes;
         emit CDPClaimed(cdpBytes, msg.sender);
     }