Re: [PATCH 0/2] diff-lib relative-path cleanups

[Junio C Hamano <gitster@pobox.com>]

Jeff King <peff@peff.net> writes:

> On Wed, Jul 15, 2026 at 08:17:06AM -0700, Junio C Hamano wrote:
>
>> Jeff King <peff@peff.net> writes:
>> 
>> > A diff using --relative ignores entries outside the current directory.
>> > This results in a segfault when we try to process an unmerged entry
>> > that's outside of our prefix, since we end up with a NULL diff_filepair
>> > and use it without checking that it's valid.
>> > ...
>> > +cc Junio, as you may have some wisdom on that further exploration.
>> 
>> Will take a look at the history myself, but I would probably not
>> have much wisdom on a change from 2011.  I often do not even
>> remember what I ate for breakfast yesterday ;-).
>
> I have the same problem. ;)
>
> Looks like you reviewed the patch in question already. Here's what I
> uncovered by digging into the history. I don't think it should have any
> functional difference (and even the "avoid unnecessary work" in patch 2
> is probably not very much work in practice), but it might be worth
> doing.
>
> This would go on top (even though patch 2 makes the original fix here
> unnecessary, I'd rather have both in place).
>
>   [1/2]: diff-lib: drop stale comment about advancing o->pos
>   [2/2]: diff-lib: skip paths outside prefix in oneway_diff()

Both patches look good to me.  Let's combine them with the original
fix into a three-patch series and merge them into 'next'.

Thanks.