Christmas Dinner

Summary
The contract defines a public state variable host as address public host;, which automatically provides a getter function for accessing its value. However, a separate explicit getter function getHost() is also implemented, introducing unnecessary redundancy. This redundant getter is used in the withdraw() function, where directly accessing the state variable host would be more efficient and clear.

Vulnerability Details
The code includes the following redundant getter:

Since host is already declared as public, the Solidity compiler automatically generates a getter function with the same functionality. The explicit implementation of getHost() adds no value and introduces unnecessary complexity.

In the withdraw() function:

The use of getHost() adds overhead and decreases readability. Instead, the variable host can be accessed directly:

Impact

The explicit getter introduces:

1. Redundancy: Public state variables already have built-in getter functions, so implementing an additional one is unnecessary.

2. Code Complexity: Using the redundant getter in other functions (e.g., withdraw()) increases the complexity and makes the code less intuitive.

3. Gas Overhead: While minimal, calling an external getter adds slightly more gas cost than directly accessing the state variable.

Tools Used

• Manual code review.

• Solidity compiler analysis for behavior confirmation.

Recommendations

1. Remove the Redundant Getter: Eliminate the getHost() function since it duplicates the functionality provided by the public state variable.

   // Remove this function

   function getHost() public view returns (address _host) {

   return host;

   }

2. Directly Access the State Variable: In the withdraw() function and other parts of the code, replace getHost()with direct access to the host variable:

   function withdraw() external onlyHost {

   address _host = host; // Directly access the state variable

   i_WETH.safeTransfer(_host, i_WETH.balanceOf(address(this)));

   i_WBTC.safeTransfer(_host, i_WBTC.balanceOf(address(this)));

   i_USDC.safeTransfer(_host, i_USDC.balanceOf(address(this)));

   }

These changes will improve code clarity, reduce redundancy, and ensure better gas efficiency.