Source code of the patches for Shellshock

I have a project for my grad level OS class, and I have decided to choose the Shellshock vulnerability bugs as my topic. There is a lot of great information out there, but I was curious if it is possible to get the source code of patches that resolved the bugs related to Shellshock. Namely, CVE-2014-6271, CVE-2014-6277, CVE-2014-6278, CVE-2014-7169, CVE-2014-7186, CVE-2014-7187 I was able to find some source code here , but I was wondering if anyone could point me to a comprehensive list of patch source. Or, which would be great, if someone could explain how I can access the patch source on my machine (since I have upgraded my machine and am no longer vulnerable).