Submission Details
Impact:
Likelihood:
[G-5] The `collectUsdcFromSelling` function is performing a useless USDC transfer
Author Revealed upon completion
The collectUsdcFromSelling function is performing a useless USDC transfer
Description
The smart contract is sending the progressive fees to itself when the collectUsdcFromSelling function is triggered. This external call is useless and is consuming a lot of gas:
function collectUsdcFromSelling(uint256 _listingId) external onlySeller(_listingId) {
Listing memory listing = s_listings[_listingId];
require(!listing.isActive, "Listing must be inactive to collect USDC");
uint256 fees = _calculateFees(listing.price);
uint256 amountToSeller = listing.price - fees;
uint256 collateralToReturn = collateralForMinting[listing.tokenId];
totalFeesCollected += fees;
amountToSeller += collateralToReturn;
@> usdc.safeTransfer(address(this), fees);
usdc.safeTransfer(msg.sender, amountToSeller);
}
Recommended Mitigation
Remove the useless external call:
function collectUsdcFromSelling(uint256 _listingId) external onlySeller(_listingId) {
Listing memory listing = s_listings[_listingId];
require(!listing.isActive, "Listing must be inactive to collect USDC");
uint256 fees = _calculateFees(listing.price);
uint256 amountToSeller = listing.price - fees;
uint256 collateralToReturn = collateralForMinting[listing.tokenId];
totalFeesCollected += fees;
amountToSeller += collateralToReturn;
- usdc.safeTransfer(address(this), fees);
usdc.safeTransfer(msg.sender, amountToSeller);
}
Rewards breakdown
nSLOC
253This contest has a flat reward structure with the following payouts:
100 EXP
20 EXP
2 EXP
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