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fix: flash liquidation safeERC20

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This commit is contained in:
Daniel Martín Jiménez 2021-02-09 16:42:02 +01:00
parent 2708551bcf
commit 70c52af816
1 changed files with 8 additions and 3 deletions
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11
contracts/adapters/FlashLiquidationAdapter.sol
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@ -6,6 +6,7 @@ import {BaseUniswapAdapter} from './BaseUniswapAdapter.sol';
import {ILendingPoolAddressesProvider} from '../interfaces/ILendingPoolAddressesProvider.sol';
import {IUniswapV2Router02} from '../interfaces/IUniswapV2Router02.sol';
import {IERC20} from '../dependencies/openzeppelin/contracts/IERC20.sol';
import {SafeERC20} from '../dependencies/openzeppelin/contracts/SafeERC20.sol';
import {DataTypes} from '../protocol/libraries/types/DataTypes.sol';
import {Helpers} from '../protocol/libraries/helpers/Helpers.sol';
import {IPriceOracleGetter} from '../interfaces/IPriceOracleGetter.sol';
@ -18,6 +19,8 @@ import {ReserveConfiguration} from '../protocol/libraries/configuration/ReserveC
* @author Aave
**/
contract FlashLiquidationAdapter is BaseUniswapAdapter {
using SafeERC20 for IERC20;
using ReserveConfiguration for DataTypes.ReserveConfigurationMap;
uint256 internal constant LIQUIDATION_CLOSE_FACTOR_PERCENT = 5000;
@ -120,7 +123,8 @@ contract FlashLiquidationAdapter is BaseUniswapAdapter {
vars.flashLoanDebt = flashBorrowedAmount.add(premium);
// Approve LendingPool to use debt token for liquidation
IERC20(borrowedAsset).approve(address(LENDING_POOL), debtToCover);
IERC20(borrowedAsset).safeApprove(address(LENDING_POOL), 0);
IERC20(borrowedAsset).safeApprove(address(LENDING_POOL), debtToCover);
// Liquidate the user position and release the underlying collateral
LENDING_POOL.liquidationCall(collateralAsset, borrowedAsset, user, debtToCover, false);
@ -152,11 +156,12 @@ contract FlashLiquidationAdapter is BaseUniswapAdapter {
}
// Allow repay of flash loan
IERC20(borrowedAsset).approve(address(LENDING_POOL), vars.flashLoanDebt);
IERC20(borrowedAsset).safeApprove(address(LENDING_POOL), 0);
IERC20(borrowedAsset).safeApprove(address(LENDING_POOL), vars.flashLoanDebt);
// Transfer remaining tokens to initiator
if (vars.remainingTokens > 0) {
IERC20(collateralAsset).transfer(initiator, vars.remainingTokens);
IERC20(collateralAsset).safeTransfer(initiator, vars.remainingTokens);
}
}