Submission Details
Severity:
No need for addition that in the swap function
Summary
Some gas can be saved by removing a check that is not needed.
Vulnerability Details
When a user call claimAndSwap firstly it claim WETH and later exchange ot to alETH:
function claimAndSwap(uint256 _amountClaim, uint256 _minOut, IRamsesRouter.route[] calldata _path) external onlyKeepers {
transmuter.claim(_amountClaim, address(this));
uint256 balBefore = asset.balanceOf(address(this));
_swapUnderlyingToAsset(_amountClaim, _minOut, _path);
uint256 balAfter = asset.balanceOf(address(this));
require((balAfter - balBefore) >= _minOut, "Slippage too high");
transmuter.deposit(asset.balanceOf(address(this)), address(this));
}
function _swapUnderlyingToAsset(uint256 _amount, uint256 minOut, IRamsesRouter.route[] calldata _path) internal {
// TODO : we swap WETH to ALETH -> need to check that price is better than 1:1
// uint256 oraclePrice = 1e18 * 101 / 100;
require(minOut > _amount, "minOut too low");
uint256 underlyingBalance = underlying.balanceOf(address(this));
@> require(underlyingBalance >= _amount, "not enough underlying balance");
IRamsesRouter(router).swapExactTokensForTokens(_amount, minOut, _path, address(this), block.timestamp);
}
The check on line 15 is not necessary, as it will always be at least equal to the current WETH balance, as it will receive the same amount when claiming on line 2.
Impact
Some gas can be saved.
Tools Used
Manual review.
Recommendations
Remove the unnecessary check.
Prize pool breakdown
Total prize
16,653 OP
nSLOC
25366 OP / LOC
15,800
853
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