finding earliest tags descended from a given commit

["J. Bruce Fields" <bfields@fieldses.org>]

Just curious: every now and then somebody will ask me what kernel
version they need to upgrade to to get some given fix.  I can find the
commit with the given fix easily enough.  How do I then find the
earliest tagged version containing that fix?

More generally, given a commit, is there a quick way to find the set of
tags which tag commits descended from the given commit?  Or to get the
subset of such tags which are earliest (in the sense that they're not
descendants of any of the others)?

I usually just do

	git-describe <commit>

to make a guess, then

	git log <tag>..<commit>

to verify, but perhaps there's something more clever, or something that
would work better in a project where the tags aren't necessarily all in
a straight line.

--b.