Zaros Part 1

Summary:

The checkPendingOrder function lacks a boolean return value to indicate the pending status of an order. This omission reduces the function's utility and forces reliance on error handling for control flow, which can be inefficient and less intuitive.

Vulnerability Details:

• Root Cause: The function checkPendingOrder is designed to verify if an order is still pending but does not return a boolean value. Instead, it uses a revert statement to indicate a pending order.

• Impact: Without a boolean return value, the function's results cannot be directly used in conditional statements, making the control flow less efficient and harder to read. This can lead to more complex and less maintainable code, as well as potential misuse or misinterpretation of the function's intent.

Code Snippet:

https://github.com/Cyfrin/2024-07-zaros/blob/d687fe96bb7ace8652778797052a38763fbcbb1b/src/perpetuals/leaves/MarketOrder.sol#L55-L65

Impact:

1. Control Flow Complexity: The current implementation forces developers to handle the revert statement, complicating the control flow and increasing the likelihood of errors.

2. Inefficiency: Using revert for control flow can be inefficient, especially when the function is called frequently, as it incurs higher gas costs and reduces readability.

3. Maintainability: Code that relies on error handling for logical checks is harder to maintain and understand, which can slow down development and debugging processes.

Tools Used:

Manual Analysis

Recommendations:

1. Add Boolean Return Value: Modify the checkPendingOrder function to return a boolean value indicating whether an order is still pending.

2. Refactor Calling Code: Update any code that calls checkPendingOrder to use the returned boolean value for control flow instead of relying on the revert statement.

Here is the recommended mitigation: