Shield Slam, Free Bull Rush, and AoO

[Battledwarf]

I'm playing a sword and board fighter that's driving strong towards Shield Master, and I'm about to pick up Shield Slam. My question is with Shield Slam, when I get a free bull rush on shield bashes, do they provoke AoOs if I don't have Improved Bull Rush?

[TGMaxMaxer]

Don't think so, I seem to remember that being called out in the feat.

Here it is

Shield Slam (Combat)

In the right position, your shield can be used to send opponents flying.

Prerequisites: Improved Shield Bash, Shield Proficiency, Two-Weapon Fighting, base attack bonus +6.

Benefit: Any opponents hit by your shield bash are also hit with a free bull rush attack, substituting your attack roll for the combat maneuver check (see Combat). This bull rush does not provoke an attack of opportunity. Opponents who cannot move back due to a wall or other surface are knocked prone after moving the maximum possible distance. You may choose to move with your target if you are able to take a 5-foot step or to spend an action to move this turn.