How can I easily apply a bugfix on several release branches in Git?

Question

I\'ve been using git for a while for my one-man developments, but I haven\'t run into any tricky branching issues until now and I seem to have forgotten something fundamental th

Answer 1

What about in this case fixing on B1.1, merging B1.1 into B1.2, then B1.2 into B1.3?