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replace snprintf with odb_pack_name()

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In several places we write the name of the pack filename
into a fixed-size buffer using snprintf(), but do not check
the return value.  As a result, a very long object directory
could cause us to quietly truncate the pack filename
(potentially leading to a corrupted repository, as a newly
written packfile could be missing its .pack extension).

We can use odb_pack_name() to do this with a strbuf (and
shorten the code, as well).

Signed-off-by: Jeff King <peff@peff.net>
Signed-off-by: Junio C Hamano <gitster@pobox.com>
This commit is contained in:
Jeff King 2017-03-16 10:27:15 -04:00 committed by Junio C Hamano
parent eaeefc3276
commit ba47a3088f
2 changed files with 24 additions and 31 deletions
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27
builtin/index-pack.c
View file

@ -1386,7 +1386,7 @@ static void final(const char *final_pack_name, const char *curr_pack_name,
unsigned char *sha1)
{
const char *report = "pack";
char name[PATH_MAX];
struct strbuf name = STRBUF_INIT;
int err;
if (!from_stdin) {
@ -1402,14 +1402,13 @@ static void final(const char *final_pack_name, const char *curr_pack_name,
int keep_fd, keep_msg_len = strlen(keep_msg);
if (!keep_name)
snprintf(name, sizeof(name), "%s/pack/pack-%s.keep",
get_object_directory(), sha1_to_hex(sha1));
odb_pack_name(&name, sha1, "keep");
keep_fd = odb_pack_keep(keep_name ? keep_name : name);
keep_fd = odb_pack_keep(keep_name ? keep_name : name.buf);
if (keep_fd < 0) {
if (errno != EEXIST)
die_errno(_("cannot write keep file '%s'"),
keep_name ? keep_name : name);
keep_name ? keep_name : name.buf);
} else {
if (keep_msg_len > 0) {
write_or_die(keep_fd, keep_msg, keep_msg_len);
@ -1417,28 +1416,22 @@ static void final(const char *final_pack_name, const char *curr_pack_name,
}
if (close(keep_fd) != 0)
die_errno(_("cannot close written keep file '%s'"),
keep_name ? keep_name : name);
keep_name ? keep_name : name.buf);
report = "keep";
}
}
if (final_pack_name != curr_pack_name) {
if (!final_pack_name) {
snprintf(name, sizeof(name), "%s/pack/pack-%s.pack",
get_object_directory(), sha1_to_hex(sha1));
final_pack_name = name;
}
if (!final_pack_name)
final_pack_name = odb_pack_name(&name, sha1, "pack");
if (finalize_object_file(curr_pack_name, final_pack_name))
die(_("cannot store pack file"));
} else if (from_stdin)
chmod(final_pack_name, 0444);
if (final_index_name != curr_index_name) {
if (!final_index_name) {
snprintf(name, sizeof(name), "%s/pack/pack-%s.idx",
get_object_directory(), sha1_to_hex(sha1));
final_index_name = name;
}
if (!final_index_name)
final_index_name = odb_pack_name(&name, sha1, "idx");
if (finalize_object_file(curr_index_name, final_index_name))
die(_("cannot store index file"));
} else
@ -1464,6 +1457,8 @@ static void final(const char *final_pack_name, const char *curr_pack_name,
input_offset += err;
}
}
strbuf_release(&name);
}
static int git_index_pack_config(const char *k, const char *v, void *cb)

28
fast-import.c
View file

@ -940,43 +940,40 @@ static const char *create_index(void)
static char *keep_pack(const char *curr_index_name)
{
static char name[PATH_MAX];
static const char *keep_msg = "fast-import";
struct strbuf name = STRBUF_INIT;
int keep_fd;
snprintf(name, sizeof(name), "%s/pack/pack-%s.keep",
get_object_directory(), sha1_to_hex(pack_data->sha1));
keep_fd = odb_pack_keep(name);
odb_pack_name(&name, pack_data->sha1, "keep");
keep_fd = odb_pack_keep(name.buf);
if (keep_fd < 0)
die_errno("cannot create keep file");
write_or_die(keep_fd, keep_msg, strlen(keep_msg));
if (close(keep_fd))
die_errno("failed to write keep file");
snprintf(name, sizeof(name), "%s/pack/pack-%s.pack",
get_object_directory(), sha1_to_hex(pack_data->sha1));
if (finalize_object_file(pack_data->pack_name, name))
odb_pack_name(&name, pack_data->sha1, "pack");
if (finalize_object_file(pack_data->pack_name, name.buf))
die("cannot store pack file");
snprintf(name, sizeof(name), "%s/pack/pack-%s.idx",
get_object_directory(), sha1_to_hex(pack_data->sha1));
if (finalize_object_file(curr_index_name, name))
odb_pack_name(&name, pack_data->sha1, "idx");
if (finalize_object_file(curr_index_name, name.buf))
die("cannot store index file");
free((void *)curr_index_name);
return name;
return strbuf_detach(&name, NULL);
}
static void unkeep_all_packs(void)
{
static char name[PATH_MAX];
struct strbuf name = STRBUF_INIT;
int k;
for (k = 0; k < pack_id; k++) {
struct packed_git *p = all_packs[k];
snprintf(name, sizeof(name), "%s/pack/pack-%s.keep",
get_object_directory(), sha1_to_hex(p->sha1));
unlink_or_warn(name);
odb_pack_name(&name, p->sha1, "keep");
unlink_or_warn(name.buf);
}
strbuf_release(&name);
}
static int loosen_small_pack(const struct packed_git *p)
@ -1035,6 +1032,7 @@ static void end_packfile(void)
die("core git rejected index %s", idx_name);
all_packs[pack_id] = new_p;
install_packed_git(new_p);
free(idx_name);
/* Print the boundary */
if (pack_edges) {