[witrak]

Taking into account how thoroughly you explain all the intricate details of memory handling it's strange that in the example you haven't clearly commented on the fact of oversimplification of handling unsuccessful allocation (leading to the potentially risky situation).

To say that "this is a nice example of how fiddly C memory management is" in the discussion is a bit too little - perhaps intended readers of the article would prefer an explicit warning there, just to be aware that they shouldn't forget to abort the program as you do.