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pack-bitmap: clean up include_check after use 

When a bitmap walk has to traverse (to fill in non-bitmapped objects),
we use rev_info's include_check mechanism to let us stop the traversal
early. But after setting the function and its data parameter, we never
clean it up. This means that if the rev_info is used for a subsequent
traversal without bitmaps, it will unexpectedly call into our
include_check function (worse, it will do so pointing to a now-defunct
stack variable in include_check_data, likely resulting in a segfault).

There's no code which does this now, but it's an accident waiting to
happen. Let's clean up after ourselves in the bitmap code.

Reported-by: David Emett <dave@sp4m.net>
Signed-off-by: Jeff King <peff@peff.net>
Signed-off-by: Junio C Hamano <gitster@pobox.com>
This commit is contained in:
Jeff King 2021-04-28 11:42:30 -04:00 committed by Junio C Hamano
parent 48bf2fa8ba
commit 1e951c6473
1 changed files with 3 additions and 0 deletions
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3
pack-bitmap.c
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@ -630,6 +630,9 @@ static struct bitmap *find_objects(struct bitmap_index *bitmap_git,
traverse_commit_list_filtered(filter, revs,
show_commit, show_object,
&show_data, NULL);
revs->include_check = NULL;
revs->include_check_data = NULL;
}
return base;