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pair-session.sol
live
1// pair-session.sol — live debug
2pragma solidity ^0.8.19;
3·
4contract Vault {
5 mapping(address => uint256) balances;
6·
7 function deposit() external payable {
8 balances[msg.sender] += msg.value;
9 }
10·
11 // ⚠ Reentrancy — caught by expert
12 function withdraw() external {
13 uint bal = balances[msg.sender];
14 balances[msg.sender] = 0; // CEI fixed ✓
15 (bool ok,) = payable(msg.sender)
16 .call{value: bal}("");
17 require(ok);
18 }
19}
20
A
alex.ethjust now

"Move the balance update before the transfer. Classic checks-effects-interactions."

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