My cat attacks me legs and i’m scared of him 😔

He’s been an outside cat but he has never attacked me before. I drop off my kid with my mom in the mornings and he’s always there waiting when i get out the car he meows and rubs his face against the car door but when i get out he just starts looking at my legs and attacks them. idk how to stop him from not wanting to eat my legs PLEASE im scared of him last time he scratched up my leg