Rendering when dropped master

So this is a potential issue that needs to be brought up sooner or later:

Let's say a client is authenticated by the current master. Then the master drops, and we have a new master (fast user switching for example).

What's the status of the clients authenticated by old masters? Should they be allowed to render and use memory resources or shouldn't they?

A typical example where this could pose a problem is where user 1 opens a drm connection, authenticates itself and then drops master. Then user 2 starts an X server and exposes all DRI contents to user 1?

/Thomas