Lamar Odom -- The Paparazzo Had It Coming

Lamar Odom just fired back at the paparazzo who sued him for assault ... claiming the whole allegation is B.S.

Lamar claims the photog -- Stefan Saad "provoked [Lamar's] unlawful and wrongful conduct."

TMZ obtained the answer Lamar just filed -- courtesy of his lawyer, Shawn Holley -- and he says it would be unjust for Saad to get a penny from him.

The incident that triggered the lawsuit occurred on July 10, when Lamar confronted Saad who was questioning him about having an alleged affair. Lamar took the photog's equipment from his car and threw it into his own car. Lamar drove a few blocks and then tossed the equipment into the street.