From 0a7e3642bc0d42a2c322886e64872ac9d736fa84 Mon Sep 17 00:00:00 2001 From: Taylor Blau Date: Wed, 13 Jan 2021 17:24:45 -0500 Subject: unpack_entry(): convert to new revindex API Remove direct manipulation of the 'struct revindex_entry' type as well as calls to the deprecated API in 'packfile.c:unpack_entry()'. Usual clean-up is performed (replacing '->nr' with calls to 'pack_pos_to_index()' and so on). Add an additional check to make sure that 'obj_offset()' points at a valid object. In the case this check is violated, we cannot call 'mark_bad_packed_object()' because we don't know the OID. At the top of the call stack is do_oid_object_info_extended() (via packed_object_info()), which does mark the object. Signed-off-by: Taylor Blau Signed-off-by: Junio C Hamano --- packfile.c | 26 ++++++++++++++++++-------- 1 file changed, 18 insertions(+), 8 deletions(-) diff --git a/packfile.c b/packfile.c index bb4bb14671..936ab3def5 100644 --- a/packfile.c +++ b/packfile.c @@ -1694,11 +1694,21 @@ void *unpack_entry(struct repository *r, struct packed_git *p, off_t obj_offset, } if (do_check_packed_object_crc && p->index_version > 1) { - struct revindex_entry *revidx = find_pack_revindex(p, obj_offset); - off_t len = revidx[1].offset - obj_offset; - if (check_pack_crc(p, &w_curs, obj_offset, len, revidx->nr)) { + uint32_t pack_pos, index_pos; + off_t len; + + if (offset_to_pack_pos(p, obj_offset, &pack_pos) < 0) { + error("could not find object at offset %"PRIuMAX" in pack %s", + (uintmax_t)obj_offset, p->pack_name); + data = NULL; + goto out; + } + + len = pack_pos_to_offset(p, pack_pos + 1) - obj_offset; + index_pos = pack_pos_to_index(p, pack_pos); + if (check_pack_crc(p, &w_curs, obj_offset, len, index_pos)) { struct object_id oid; - nth_packed_object_id(&oid, p, revidx->nr); + nth_packed_object_id(&oid, p, index_pos); error("bad packed object CRC for %s", oid_to_hex(&oid)); mark_bad_packed_object(p, oid.hash); @@ -1781,11 +1791,11 @@ void *unpack_entry(struct repository *r, struct packed_git *p, off_t obj_offset, * This is costly but should happen only in the presence * of a corrupted pack, and is better than failing outright. */ - struct revindex_entry *revidx; + uint32_t pos; struct object_id base_oid; - revidx = find_pack_revindex(p, obj_offset); - if (revidx) { - nth_packed_object_id(&base_oid, p, revidx->nr); + if (!(offset_to_pack_pos(p, obj_offset, &pos))) { + nth_packed_object_id(&base_oid, p, + pack_pos_to_index(p, pos)); error("failed to read delta base object %s" " at offset %"PRIuMAX" from %s", oid_to_hex(&base_oid), (uintmax_t)obj_offset, -- cgit v1.2.3