An October expiration gives you ample time to go and come back. India shouldn't care since you're a citizen. The US doesn't either, as you are a permanent resident (and Indian passports are backed by the government up until 6 months after they expire, at least with relation to the US).
*** El Cafe ***
N400 - NYC (Brooklyn)
March 12 2010: Sent
April 7 2010: FP done- walk-in
August 3 2010: ID decision not made
December 12 2010: Lawsuit filed under 8 USC 1447(b)
March 31 2011: 31 Oath date
April 1 2011: Passport applied, picked up!