Login redirect, session, and flexiauth

[eluser]Unknown[/eluser]
So I am using Flexi Auth to handle my logins, but I want to redirect back to the referring page after login. The way I thought of doing it is like this:

on a page set a session to refer variable that is just the controller, not the url;
after you click the login page and you are authenticated it get's the refer session variable and does a redirect back;

Is there something I am missing security wise that would make this a bad idea?