revision.c: handle tag->tagged == NULL

Signed-off-by: Martin Koegler <mkoegler@auto.tuwien.ac.at>
Signed-off-by: Junio C Hamano <gitster@pobox.com>

diff --git a/revision.c b/revision.c
index 484e5e7959d4583ed474e81f3a39e4569f2c7b76..b1aebf8999b5a9ba80cba659a28f9152c05da85c 100644 (file)
--- a/revision.c
+++ b/revision.c
@@ -177,6 +177,8 @@ static struct commit *handle_commit(struct rev_info *revs, struct object *object
                struct tag *tag = (struct tag *) object;
                if (revs->tag_objects && !(flags & UNINTERESTING))
                        add_pending_object(revs, object, tag->tag);
+               if (!tag->tagged)
+                       die("bad tag");
                object = parse_object(tag->tagged->sha1);
                if (!object)
                        die("bad object %s", sha1_to_hex(tag->tagged->sha1));
@@ -689,6 +691,8 @@ static int add_parents_only(struct rev_info *revs, const char *arg, int flags)
                it = get_reference(revs, arg, sha1, 0);
                if (it->type != OBJ_TAG)
                        break;
+               if (!((struct tag*)it)->tagged)
+                       return 0;
                hashcpy(sha1, ((struct tag*)it)->tagged->sha1);
        }
        if (it->type != OBJ_COMMIT)