From 5c2ec07b709d7dae63998d6a9f58277d4a67e266 Mon Sep 17 00:00:00 2001
From: The3D <emilio@aave.com>
Date: Wed, 16 Sep 2020 17:12:07 +0200
Subject: [PATCH] Fixes #42

---
 contracts/lendingpool/LendingPool.sol  | 2 ++
 contracts/libraries/helpers/Errors.sol | 1 +
 2 files changed, 3 insertions(+)

diff --git a/contracts/lendingpool/LendingPool.sol b/contracts/lendingpool/LendingPool.sol
index e6a3c059..c9919495 100644
--- a/contracts/lendingpool/LendingPool.sol
+++ b/contracts/lendingpool/LendingPool.sol
@@ -44,6 +44,7 @@ contract LendingPool is VersionedInitializable, ILendingPool {
   uint256 public constant REBALANCE_DOWN_RATE_DELTA = (1e27) / 5;
   uint256 public constant MAX_STABLE_RATE_BORROW_SIZE_PERCENT = 25;
   uint256 public constant FLASHLOAN_PREMIUM_TOTAL = 9;
+  uint256 public constant MAX_NUMBER_RESERVES = 128;
 
   ILendingPoolAddressesProvider internal _addressesProvider;
 
@@ -945,6 +946,7 @@ contract LendingPool is VersionedInitializable, ILendingPool {
    **/
   function _addReserveToList(address asset) internal {
     bool reserveAlreadyAdded = false;
+    require(_reservesList.length < MAX_NUMBER_RESERVES, Errors.NO_MORE_RESERVES_ALLOWED);
     for (uint256 i = 0; i < _reservesList.length; i++)
       if (_reservesList[i] == asset) {
         reserveAlreadyAdded = true;
diff --git a/contracts/libraries/helpers/Errors.sol b/contracts/libraries/helpers/Errors.sol
index d25b041b..23431b03 100644
--- a/contracts/libraries/helpers/Errors.sol
+++ b/contracts/libraries/helpers/Errors.sol
@@ -43,6 +43,7 @@ library Errors {
   string public constant FAILED_REPAY_WITH_COLLATERAL = '53';
   string public constant FAILED_COLLATERAL_SWAP = '55';
   string public constant INVALID_EQUAL_ASSETS_TO_SWAP = '56';
+  string public constant NO_MORE_RESERVES_ALLOWED = '59';
 
   // require error messages - aToken
   string public constant CALLER_MUST_BE_LENDING_POOL = '28'; // 'The caller of this function must be a lending pool'