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Submission Details
Severity: medium

Return values of `transfer()`/`transferFrom()` not checked

neocrao

Summary

Return values of transfer()/transferFrom() not checked

Vulnerability Details

Not all IERC20 implementations revert() when there's a failure in
transfer()/transferFrom(). The function signature has a boolean
return value and they indicate errors that way instead. By not checking
the return value, operations that should have marked as failed, may
potentially go through without actually making a payment

File: src/Fees.sol
​
43: IERC20(WETH).transfer(staking, IERC20(WETH).balanceOf(address(this)));
​

Link to code - https://github.com/Cyfrin/2023-07-beedle/tree/main/src/Fees.sol

File: src/Lender.sol
​
152: IERC20(p.loanToken).transferFrom(
​
159: IERC20(p.loanToken).transfer(
​
187: IERC20(pools[poolId].loanToken).transferFrom(
​
203: IERC20(pools[poolId].loanToken).transfer(msg.sender, amount);
​
267: IERC20(loan.loanToken).transfer(feeReceiver, fees);
​
269: IERC20(loan.loanToken).transfer(msg.sender, debt - fees);
​
271: IERC20(loan.collateralToken).transferFrom(
​
317: IERC20(loan.loanToken).transferFrom(
​
323: IERC20(loan.loanToken).transferFrom(
​
329: IERC20(loan.collateralToken).transfer(
​
403: IERC20(loan.loanToken).transfer(feeReceiver, protocolInterest);
​
505: IERC20(loan.loanToken).transfer(feeReceiver, protocolInterest);
​
563: IERC20(loan.collateralToken).transfer(feeReceiver, govFee);
​
565: IERC20(loan.collateralToken).transfer(
​
642: IERC20(loan.loanToken).transferFrom(
​
651: IERC20(loan.loanToken).transfer(feeReceiver, fee);
​
653: IERC20(loan.loanToken).transfer(msg.sender, debt - debtToPay - fee);
​
656: IERC20(loan.loanToken).transfer(feeReceiver, protocolInterest);
​
663: IERC20(loan.collateralToken).transferFrom(
​
670: IERC20(loan.collateralToken).transfer(
​

Link to code - https://github.com/Cyfrin/2023-07-beedle/tree/main/src/Lender.sol

File: src/Staking.sol
​
39: TKN.transferFrom(msg.sender, address(this), _amount);
​
49: TKN.transfer(msg.sender, _amount);
​
55: WETH.transfer(msg.sender, claimable[msg.sender]);
​

Link to code - https://github.com/Cyfrin/2023-07-beedle/tree/main/src/Staking.sol

Tools Used

Code Review

Recommendations

Check the return values of transfer()/transferFrom()

Auditor

NeoCrao

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