wireshark: yet another pile of dissector flaws

remember that the dissectors are written by a much wider group of people than the core wireshark team. the dissectors are then contributed and distributed along with the core.

As a result, the dissectors are only as good as people who care about that particular type of traffic

also note that these flaws are almost always 'crash' or 'loop/DoS' types of things. That says that the core wireshark team is doing a fairly good job of sandboxing the dissector code to limit the damage it can do.

Changing this to be in some other language would not prevent problems in the code from either causing exceptions or infinite loops.