From e162aed591154612cbc646ab19808096d226fce5 Mon Sep 17 00:00:00 2001 From: Taylor Blau Date: Tue, 11 Jun 2024 13:28:24 -0400 Subject: [PATCH] pack-revindex.c: guard against out-of-bounds pack lookups 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 Signed-off-by: Junio C Hamano --- pack-revindex.c | 3 +++ 1 file changed, 3 insertions(+) diff --git a/pack-revindex.c b/pack-revindex.c index fc63aa76a2..93ffca7731 100644 --- a/pack-revindex.c +++ b/pack-revindex.c @@ -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.