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write_reuse_object(): convert to new revindex API

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First replace 'find_pack_revindex()' with its replacement
'offset_to_pack_pos()'. This prevents any bogus OFS_DELTA that may make
its way through until 'write_reuse_object()' from causing a bad memory
read (if 'revidx' is 'NULL')

Next, replace a direct access of '->nr' with the wrapper function
'pack_pos_to_index()'.

Signed-off-by: Taylor Blau <me@ttaylorr.com>
Signed-off-by: Junio C Hamano <gitster@pobox.com>
This commit is contained in:
Taylor Blau 2021-01-13 17:23:35 -05:00 committed by Junio C Hamano
parent f33fb6e419
commit 952fc6870d
1 changed files with 9 additions and 4 deletions
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13
builtin/pack-objects.c
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@ -419,7 +419,7 @@ static off_t write_reuse_object(struct hashfile *f, struct object_entry *entry,
{
struct packed_git *p = IN_PACK(entry);
struct pack_window *w_curs = NULL;
struct revindex_entry *revidx;
uint32_t pos;
off_t offset;
enum object_type type = oe_type(entry);
off_t datalen;
@ -436,10 +436,15 @@ static off_t write_reuse_object(struct hashfile *f, struct object_entry *entry,
type, entry_size);
offset = entry->in_pack_offset;
revidx = find_pack_revindex(p, offset);
datalen = revidx[1].offset - offset;
if (offset_to_pack_pos(p, offset, &pos) < 0)
die(_("write_reuse_object: could not locate %s, expected at "
"offset %"PRIuMAX" in pack %s"),
oid_to_hex(&entry->idx.oid), (uintmax_t)offset,
p->pack_name);
datalen = pack_pos_to_offset(p, pos + 1) - offset;
if (!pack_to_stdout && p->index_version > 1 &&
check_pack_crc(p, &w_curs, offset, datalen, revidx->nr)) {
check_pack_crc(p, &w_curs, offset, datalen,
pack_pos_to_index(p, pos))) {
error(_("bad packed object CRC for %s"),
oid_to_hex(&entry->idx.oid));
unuse_pack(&w_curs);