DAOWallet.sol (SmartContractSecurity.com)

gistfile1.txt

pragma solidity ^0.6.10;

contract DAOWallet {
    mapping(address => uint) public balances;
    bool internal locked;
    
    function deposit() public payable {
        balances[msg.sender] += msg.value;
    }
    
    modifier noReentranct() {
        require(!locked, "Absolutely no re-entrancy!");
        locked = true;
        _;
        locked = false;
    }
    
    // mutex
    function unsafeWithdraw(uint _amount) public noReentranct {
        require(balances[msg.sender] >= _amount);
        
        (bool sent, ) = msg.sender.call{value: _amount}("");
        require(sent, "Money transfer failed!");
        
        balances[msg.sender] -= _amount;
    }
    
    function getAccountBalance() public view returns (uint) {
        return address(this).balance;
    }

}