Merge branch 'jk/fast-import-fixes' into maint

* jk/fast-import-fixes:
  fast-import: fix buffer overflow in dump_tags
  fast-import: clean up pack_data pointer in end_packfile

fast-import.c

@@ -946,10 +946,12 @@ static void unkeep_all_packs(void)
 
 static void end_packfile(void)
 {
-	struct packed_git *old_p = pack_data, *new_p;
+	if (!pack_data)
+		return;
 
 	clear_delta_base_cache();
 	if (object_count) {
+		struct packed_git *new_p;
 		unsigned char cur_pack_sha1[20];
 		char *idx_name;
 		int i;
@@ -991,10 +993,11 @@ static void end_packfile(void)
 		pack_id++;
 	}
 	else {
-		close(old_p->pack_fd);
+		close(pack_data->pack_fd);
-		unlink_or_warn(old_p->pack_name);
+		unlink_or_warn(pack_data->pack_name);
 	}
-	free(old_p);
+	free(pack_data);
+	pack_data = NULL;
 
 	/* We can't carry a delta across packfiles. */
 	strbuf_release(&last_blob.data);
@@ -1731,14 +1734,16 @@ static void dump_tags(void)
 	static const char *msg = "fast-import";
 	struct tag *t;
 	struct ref_lock *lock;
-	char ref_name[PATH_MAX];
+	struct strbuf ref_name = STRBUF_INIT;
 
 	for (t = first_tag; t; t = t->next_tag) {
-		sprintf(ref_name, "tags/%s", t->name);
+		strbuf_reset(&ref_name);
-		lock = lock_ref_sha1(ref_name, NULL);
+		strbuf_addf(&ref_name, "tags/%s", t->name);
+		lock = lock_ref_sha1(ref_name.buf, NULL);
 		if (!lock || write_ref_sha1(lock, t->sha1, msg) < 0)
-			failure |= error("Unable to update %s", ref_name);
+			failure |= error("Unable to update %s", ref_name.buf);
 	}
+	strbuf_release(&ref_name);
 }
 
 static void dump_marks_helper(FILE *f,