File: SecondSwap_StepVesting.sol

    function claim() external {
        (uint256 claimableAmount, uint256 claimableSteps) = claimable(msg.sender);
        require(claimableAmount > 0, "SS_StepVesting: nothing to claim");

        Vesting storage vesting = _vestings[msg.sender];
        vesting.stepsClaimed += claimableSteps;
        vesting.amountClaimed += claimableAmount;

        token.safeTransfer(msg.sender, claimableAmount); //  3.6. DOS caused by the use of transfer and transferFrom functions
        emit Claimed(msg.sender, claimableAmount);
    }
File: SecondSwap_StepVesting.sol

    function transferVesting(address _grantor, address _beneficiary, uint256 _amount) external {
        require(
            msg.sender == tokenIssuer || msg.sender == manager || msg.sender == vestingDeployer,
            "SS_StepVesting: unauthorized"
        );
        require(_beneficiary != address(0), "SS_StepVesting: beneficiary is zero");
        require(_amount > 0, "SS_StepVesting: amount is zero");
        Vesting storage grantorVesting = _vestings[_grantor];
        require(
            grantorVesting.totalAmount - grantorVesting.amountClaimed >= _amount,
            "SS_StepVesting: insufficient balance"
        ); // 3.8. Claimed amount not checked in transferVesting function

        grantorVesting.totalAmount -= _amount;
        grantorVesting.releaseRate = grantorVesting.totalAmount / numOfSteps;

        _createVesting(_beneficiary, _amount, grantorVesting.stepsClaimed, true);

        emit VestingTransferred(_grantor, _beneficiary, _amount);
    }
File: SecondSwap_StepVesting.sol

    function transferVesting(address _grantor, address _beneficiary, uint256 _amount) external {
       ...
        Vesting storage grantorVesting = _vestings[_grantor];
>       require(
>           grantorVesting.totalAmount - grantorVesting.amountClaimed >= _amount,
>           "SS_StepVesting: insufficient balance"
        ); // 3.8. Claimed amount not checked in transferVesting function
        ...
