First Flight #3: Thunder Loan

Overview

In this audit report, we will review the deposit function provided. Specifically, we will address the concern regarding the placement of the safeTransferFrom function within the deposit function.

Code Issue
The safeTransferFrom function is placed after several state updates and calculations within the deposit function. This may create a vulnerability to reentrancy attacks, as the tokens should be transferred to the contract before any state updates occur.

Recommendation
To ensure the security of the contract and prevent potential reentrancy attacks, we recommend moving the safeTransferFrom function to the beginning of the deposit function. By doing so, the tokens will be transferred to the contract before any state updates or calculations take place. This ensures that the necessary tokens are available for the subsequent operations and reduces the risk of reentrancy vulnerabilities.

Updated deposit function:

Proof of Concept

The updated code snippet above moves the safeTransferFrom function to the beginning of the deposit function, ensuring that the tokens are transferred to the contract before any state updates or calculations occur.

Conclusion

In conclusion, we have reviewed the deposit function and identified the issue with the placement of the safeTransferFrom function. We recommend moving the safeTransferFrom to the beginning of the function to ensure that tokens are transferred to the contract before any state updates occur. This mitigates the risk of reentrancy attacks and ensures the integrity and security of the contract.