Submit a Patch to oss-fuzz repo

One-time Setup

Create github account if needed (with @google.com email address, preferably) and log in.
To allow “git push” to work, you’ll have to add an SSH key: https://help.github.com/articles/connecting-to-github-with-ssh/
Go to https://github.com/google/oss-fuzz and click on “Fork”.
Go to your own fork of the repo, which will be at https://github.com/<git_username>/oss-fuzz
Click on “clone or download” and pick “Clone with SSH” method (I found that easier to use for “git push”). Then copy that URL and run “git clone <URL>” in terminal. Now you have a local repo, and your fork of the remote repo will be called “origin” in your git config.
Configure a remote repo pointing to the upstream repo (https://github.com/google/oss-fuzz) so that it’s called “upstream”:
- cd <local_oss_fuzz_repo_directory>/oss-fuzz
- git remote add upstream git@github.com:google/oss-fuzz.git
- git remote -v

NOTE: For trivial changes it's possible to edit the files in the web UI on the main project and create a commit + pull request from that.

Go to your repo:
- cd <local_oss_fuzz_repo_directory>/oss-fuzz
Create a new branch:
- git checkout master
- git checkout -b new_feature_xyz
Make your changes and commit them locally with “git commit”
Push your changes to your fork on github
- git push -u origin HEAD
- (This will create a branch of the same name “new_feature_xyz” on your fork “origin”).
Open your fork in browser and click on “Compare & pull request” and follow the prompts.
If changes are requested to the patch:
- make changes to the same local branch
- commit them locally with “git commit” (but DO NOT amend!)
- git push -u origin HEAD
Once pull request is closed:
- Delete “new_feature_xyz” branch on your fork using the “Delete branch” button on the pull request
- Delete local “new_feature_xyz” branch locally with “git checkout master && git branch -D new_feature_xyz”
- Sync your local repo and your fork with upstream repo:
  - git checkout master
  - git fetch upstream
  - git merge upstream/master
  - git push origin master