currentBalance = vault.balanceOfJPEG() + jpeg.balanceOf(address(this));
uint256 newRewards = currentBalance - previousBalance;
function setController(address _controller) public onlyOwner {
    // @audit can reduce balanceofJpeg which breaks other masterchef contract
    require(_controller != address(0), "INVALID_CONTROLLER");
    controller = IController(_controller);
}

function balanceOfJPEG() external view returns (uint256) {
    // @audit new controller could return a smaller balance
    return controller.balanceOfJPEG(address(token));
}
