After a rain fall I noticed that I had water dripping inside my car from a pillar. I believe its cause from either a rust spot on the drip rail above the driver side, or it came in from the windshield because under the top corner of the drivers side trim you can see a gap between the trim and body whereas on the other side there is a piece of black material that seems to plug up that small gap.
I was to fix this problem before winter comes so responses are appreciated.

I was to fix this problem before winter comes so responses are appreciated.