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pack-revindex.c: guard against out-of-bounds pack lookups

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The function midx_key_to_pack_pos() is a helper function used by
midx_to_pack_pos() and midx_pair_to_pack_pos() to translate a (pack,
offset) tuple into a position into the MIDX pseudo-pack order.

Ensure that the pack ID given to midx_pair_to_pack_pos() is bounded by
the number of packs within the MIDX to prevent, for instance,
uninitialized memory from being used as a pack ID.

Signed-off-by: Taylor Blau <me@ttaylorr.com>
Signed-off-by: Junio C Hamano <gitster@pobox.com>
This commit is contained in:
Taylor Blau 2024-06-11 13:28:24 -04:00 committed by Junio C Hamano
parent ed4a1d6ae1
commit e162aed591
1 changed files with 3 additions and 0 deletions
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pack-revindex.c
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@ -527,6 +527,9 @@ static int midx_key_to_pack_pos(struct multi_pack_index *m,
{
uint32_t *found;
if (key->pack >= m->num_packs)
BUG("MIDX pack lookup out of bounds (%"PRIu32" >= %"PRIu32")",
key->pack, m->num_packs);
/*
* The preferred pack sorts first, so determine its identifier by
* looking at the first object in pseudo-pack order.