Verified answer

No, Madara is not inside of Naruto. Minato have sealed half of kyuubi's chakra in himself and half in naruto! Madara disappears When he fights with minato! Everyone says the one who fought minato was madara!

But later Naruto controls nine 9 tails fox!

No, Madara is not inside Naruto because when Madara and Harishima fought he surpassed the nine tails.

The last person I know that had the 9 tails in control was the "Masked Man" aka Obito, but the 4th Hokage, Minato released the 9 tails from his control. After that it all adds up to the 9 tails being sealed inside Naruto.

Naruto doesn't control the 9 tails, he said that he wouldn't either.

Madara never infested the nine tails like Orochimaru does to his victims. He used his sharigan to surplant the fox's will with a jutsu.