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@xxxxxxxxxxxx>
---
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.
--
2.45.2.447.g6b4ffca7ec.dirty
