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Audit Results
2
Critical
3
High
5
Medium
4
Low
Unchecked Return Value from External Call
Critical
The contract does not check the return value when calling an external contract. This could lead to silent failures and unexpected behavior.
function transferTokens(address token, address recipient, uint256 amount) external {
// Missing return value check
token.call(abi.encodeWithSignature("transfer(address,uint256)", recipient, amount));
}
File: TokenManager.sol, Line: 42-45
Recommendation:
Always check the return value of external calls to ensure they succeeded:
function transferTokens(address token, address recipient, uint256 amount) external {
// Check return value
(bool success, ) = token.call(abi.encodeWithSignature("transfer(address,uint256)", recipient, amount));
require(success, "Token transfer failed");
}
Integer Overflow
High
The contract performs arithmetic operations without checking for overflow or underflow. This can lead to unexpected behavior and potential security vulnerabilities.
function calculateReward(uint256 amount) public returns (uint256) {
// No overflow check
return amount * rewardMultiplier;
}
File: RewardCalculator.sol, Line: 78-81
Recommendation:
Use SafeMath library or Solidity 0.8.0+ which has built-in overflow checks:
// For Solidity 0.8.0+
function calculateReward(uint256 amount) public returns (uint256) {
return amount * rewardMultiplier; // Overflow will now revert
}
// For older Solidity versions, use SafeMath
using SafeMath for uint256;
function calculateReward(uint256 amount) public returns (uint256) {
return amount.mul(rewardMultiplier);
}