Commit 9534f40b authored by Junio C Hamano's avatar Junio C Hamano

Be careful when dereferencing tags.

One caller of deref_tag() was not careful enough to make sure
what deref_tag() returned was not NULL (i.e. we found a tag
object that points at an object we do not have).  Fix it, and
warn about refs that point at such an incomplete tag where
needed.
Signed-off-by: default avatarJunio C Hamano <[email protected]>
parent 2fd955cc
......@@ -55,7 +55,7 @@ static struct commit *check_commit(struct object *obj,
struct commit *lookup_commit_reference_gently(const unsigned char *sha1,
int quiet)
{
struct object *obj = deref_tag(parse_object(sha1));
struct object *obj = deref_tag(parse_object(sha1), NULL, 0);
if (!obj)
return NULL;
......
......@@ -38,9 +38,9 @@ static void rev_list_push(struct commit *commit, int mark)
static int rev_list_insert_ref(const char *path, const unsigned char *sha1)
{
struct object *o = deref_tag(parse_object(sha1));
struct object *o = deref_tag(parse_object(sha1), path, 0);
if (o->type == commit_type)
if (o && o->type == commit_type)
rev_list_push((struct commit *)o, SEEN);
return 0;
......@@ -317,7 +317,8 @@ static int everything_local(struct ref **refs, int nr_match, char **match)
* Don't mark them common yet; the server has to be told so first.
*/
for (ref = *refs; ref; ref = ref->next) {
struct object *o = deref_tag(lookup_object(ref->old_sha1));
struct object *o = deref_tag(lookup_object(ref->old_sha1),
NULL, 0);
if (!o || o->type != commit_type || !(o->flags & COMPLETE))
continue;
......
......@@ -164,7 +164,7 @@ int main(int argc, char **argv)
continue;
}
o = deref_tag(parse_object(sha1));
o = deref_tag(parse_object(sha1), *argv, 0);
if (!o || o->type != commit_type) {
fprintf(stderr, "Could not get commit for %s. Skipping.\n",
*argv);
......
......@@ -126,12 +126,12 @@ static int ref_newer(const unsigned char *new_sha1,
/* Both new and old must be commit-ish and new is descendant of
* old. Otherwise we require --force.
*/
o = deref_tag(parse_object(old_sha1));
o = deref_tag(parse_object(old_sha1), NULL, 0);
if (!o || o->type != commit_type)
return 0;
old = (struct commit *) o;
o = deref_tag(parse_object(new_sha1));
o = deref_tag(parse_object(new_sha1), NULL, 0);
if (!o || o->type != commit_type)
return 0;
new = (struct commit *) o;
......
......@@ -13,9 +13,10 @@ static int add_info_ref(const char *path, const unsigned char *sha1)
fprintf(info_ref_fp, "%s %s\n", sha1_to_hex(sha1), path);
if (o->type == tag_type) {
o = deref_tag(o);
fprintf(info_ref_fp, "%s %s^{}\n",
sha1_to_hex(o->sha1), path);
o = deref_tag(o, path, 0);
if (o)
fprintf(info_ref_fp, "%s %s^{}\n",
sha1_to_hex(o->sha1), path);
}
return 0;
}
......
......@@ -349,7 +349,7 @@ static int peel_onion(const char *name, int len, unsigned char *sha1)
if (!o)
return -1;
if (!type_string) {
o = deref_tag(o);
o = deref_tag(o, name, sp - name - 2);
if (!o || (!o->parsed && !parse_object(o->sha1)))
return -1;
memcpy(sha1, o->sha1, 20);
......
......@@ -3,10 +3,15 @@
const char *tag_type = "tag";
struct object *deref_tag(struct object *o)
struct object *deref_tag(struct object *o, const char *warn, int warnlen)
{
while (o && o->type == tag_type)
o = parse_object(((struct tag *)o)->tagged->sha1);
if (!o && warn) {
if (!warnlen)
warnlen = strlen(warn);
error("missing object referenced by '%.*s'", warnlen, warn);
}
return o;
}
......
......@@ -15,6 +15,6 @@ struct tag {
extern struct tag *lookup_tag(const unsigned char *sha1);
extern int parse_tag_buffer(struct tag *item, void *data, unsigned long size);
extern int parse_tag(struct tag *item);
extern struct object *deref_tag(struct object *);
extern struct object *deref_tag(struct object *, const char *, int);
#endif /* TAG_H */
......@@ -226,7 +226,7 @@ static int send_ref(const char *refname, const unsigned char *sha1)
nr_our_refs++;
}
if (o->type == tag_type) {
o = deref_tag(o);
o = deref_tag(o, refname, 0);
packet_write(1, "%s %s^{}\n", sha1_to_hex(o->sha1), refname);
}
return 0;
......
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