basket interference?

[chrisall]

This happened to me while officiating a game last night. Please help me know the correct call to make if it ever happens again.
An offensive player makes an attempt for a three pointer. A defensive player close to the basket jumps in an attempt to rebound the ball. His jump is early, and he also gets pushed by an offensive player toward the basket. His forward momentum toward the rim causes him to interfere with the 3 point attempt, causing the shot to come out of the cylinder. I blew my whistle and called a foul on the offensive player that did the pushing. I did not know what to do about the basket interference. What is the correct thing to do? Is the basket good, even though the defensive player was pushed toward the rim? Please help me!