[M-1] Lack of input validation in calcLPTokenUnderlying function

The calcLPTokenUnderlying function in the ProportionalLPToken2 contract lacks input validation for the lpTokenAmount parameter. This could potentially lead to unexpected behavior or exploitation if the provided LP token amount exceeds the total supply of LP tokens (lpTokenSupply).

Vulnerability Details

The vulnerability arises due to the absence of input validation for the lpTokenAmount parameter in the calcLPTokenUnderlying function of the ProportionalLPToken2 contract. Without proper validation, there is no check to ensure that lpTokenAmount does not exceed the total supply of LP tokens (lpTokenSupply), which could lead to unintended consequences or exploitation.

Impact

If exploited, this vulnerability could impact the functionality and integrity of the calcLPTokenUnderlying function. Specifically, it allows for the calculation of underlying token amounts even when the provided LP token amount exceeds the total supply of LP tokens. This could result in incorrect calculations or unexpected behavior in systems relying on this contract.

Recommendations

To mitigate this vulnerability, it's recommended to add input validation to ensure that the lpTokenAmount does not exceed the total supply of LP tokens (lpTokenSupply). This can be achieved by adding a require statement at the beginning of the function:

By adding this validation, the contract will revert execution if the provided lpTokenAmount exceeds the total supply of LP tokens, ensuring that calculations are performed within expected bounds.