Tadle

Summary

During the audit of the provided smart contract code, it was observed that certain internal functions were declared but never used. Internal functions in Solidity are designed to be called within the contract or from derived contracts. When these functions are not used, they increase the gas consumption and add unnecessary complexity to the contract, potentially making it more difficult for auditors to understand the logic.

Vulnerability Details

• Issue: Unused Internal Functions 2024-08-tadle/src/libraries/RelatedContractLibraries.sol

• Code: The getDeliveryPlace function in the RelatedContractLibraries library was declared but never utilized in any part of the contract or related contracts.

• Location:

  /// @dev Get interface of delivery place function getDeliveryPlace( ITadleFactory _tadleFactory ) internal view returns (IDeliveryPlace) { return IDeliveryPlace(_tadleFactory.relatedContracts(DELIVERY_PLACE)); }

• Impact: Having dead code in a smart contract leads to unnecessary gas usage and increased complexity. It can also lead to confusion during auditing and maintenance, as auditors and developers need to spend time understanding unused code.

Impact

• Gas Efficiency: The presence of unused internal functions consumes additional gas during deployment, which could otherwise be saved.

• Complexity: Unused code increases the overall complexity of the contract, making it harder to read, maintain, and audit.

• Auditability: The existence of dead code can cause issues for auditors in understanding the contract’s intended logic and flow, potentially leading to overlooked vulnerabilities.

Tools Used

• Manual Code Review

• Solidity Static Analysis Tools

Recommendations

• Remove Unused Functions: The internal functions that are not used should be removed from the contract. This reduces unnecessary gas consumption and simplifies the contract’s logic.

• Code Refactoring: Regularly review and refactor the code to ensure that all functions serve a purpose and that there is no dead code.

Fixed Code Example

After applying the recommended changes, the getDeliveryPlace function has been completely removed from the RelatedContractLibraries library, as it was not utilized in the contract.

Before:

/// @dev Get interface of delivery place function getDeliveryPlace( ITadleFactory _tadleFactory ) internal view returns (IDeliveryPlace) { return IDeliveryPlace(_tadleFactory.relatedContracts(DELIVERY_PLACE)); }

After: The getDeliveryPlace function has been removed from the codebase.

Conclusion

The removal of unused internal functions enhances the contract’s efficiency, reduces unnecessary gas usage, and simplifies the overall code structure. It is recommended that developers continue to monitor and refactor the codebase regularly to ensure that only relevant and utilized functions remain within the contract.