First Flight #18: T-Swap

Summary

This report analyzes the findings from a Slither scan of the TSwapPool smart contract. The scan identified a potential vulnerability related to the use of strict equality for condition checking.

Vulnerability Details

Dangerous Strict Equality

• Location: TSwapPool.sol, lines 80-85

• Code: amount == 0 (line 81)

• Description: The function revertIfZero(uint256) uses a strict equality check to revert if the provided amount is zero. Strict equality checks (==) can be dangerous because they might lead to unexpected behavior, especially in the context of smart contracts where subtle differences in data types or states can occur.

• Reference: Slither Detector Documentation: Dangerous Strict Equalities

Impact

Using a strict equality check for zero in a critical function like revertIfZero can potentially lead to unexpected reverts or missed reverts. This can disrupt the normal operation of the contract, affecting the liquidity addition and withdrawal processes, as well as swap operations. If not handled properly, it could lead to loss of funds, user frustration, and loss of trust in the smart contract.

Tools Used

• Slither

Recommendations

To mitigate the risks associated with strict equality checks, consider the following recommendations:

1. Type-Safe Comparisons: Ensure that all comparisons are type-safe and account for potential edge cases. For instance, use safe math libraries to handle comparisons where underflow or overflow could occur.

2. Error Handling: Implement robust error handling mechanisms to provide clear and informative messages to users, helping them understand the cause of any issues.

By addressing the identified vulnerability and following these recommendations, the TSwapPool contract can be made more secure and reliable for users.