Can you cite any commits for any open source software where a back door was attempted to be introduced & code review found it pre-emptively?

The reason I ask is that this is an oft repeated claim about open source by developers yet when I talk to security people they don’t seem to care about open source nearly as much. To them inspecting binaries is table stakes anyway.

Meanwhile people write backdoors that aren’t obvious for fun. http://underhanded-c.org/