Lamar Odom's Dad -- We're Working Things Out

It's the Lamar Odom reconciliation no one expected -- less than a month after publicly ripping his father ... TMZ has learned the two are patching things up in a big way.

Joe Odom and Lamar were spotted walking together in Venice last weekend ... and sources close to the Odoms tell us they've been hanging out for the last week or so around Marina del Rey, where Joe lives. The pic first posted on terezowens.com

We're told they've been hanging at the beach, eating out together, etc. -- and things are going well. Lamar has even been spending nights at his dad's place.

As we reported, Lamar and his dad had a massive falling out over comments Joe made to the media, blaming the Kardashians for Lamar's crack addiction ... and calling Kris Jenner "an evil bitch." Joe said Lamar cut off his rent soon after that.

It's unclear if Lamar will resume paying his dad's rent -- which he's been doing for years.

FYI, if Lamar doesn't pay by October 23, we're told Joe could be out on his ass.