Relevant GitHub Links

https://github.com/Cyfrin/2024-05-TSender/blob/c6da9ef0c28741c007a02dfa07b7e899c1c22e47/src/protocol/TSender.sol#L76C14-L79C18

Summary

The TSender contract performs redundant zero address checks in the airdropERC20 function. This redundancy results in unnecessary gas consumption.

Vulnerability Details

The contract contains two separate checks for zero addresses: one in TSender::areListsValid and another in TSender::airdropERC20. This duplication is not needed and can be optimized to reduce gas usage.

Impact

The redundant check leads to increased gas costs.

Tools Used

Manual Review

Recommendations

Remove the zero address check from the TSender::airdropERC20 function and rely on the TSender::areListsValid function to perform this validation.