The tsearch2 module in PostgreSQL 7.4 through 8.0.x declares the (1) dex_init (2) snb_en_init (3) snb_ru_init (4) spell_init and (5) syn_init functions as \internal\ even when they do not take an internal argument which allows attackers to cause a denial of service (application crash) and possibly have other impacts via SQL commands that call other functions that accept internal arguments.