Merge branch 'jk/plug-list-object-filter-leaks'

The code that manages list-object-filter structure, used in partial
clones, leaked the instances, which has been plugged.

* jk/plug-list-object-filter-leaks:
  prepare_repo_settings(): plug leak of config values
  list_objects_filter_options: plug leak of filter_spec strings
  transport: free filter options in disconnect_git()
  transport: deep-copy object-filter struct for fetch-pack
  list_objects_filter_copy(): deep-copy sparse_oid_name field

list-objects-filter-options.c

@@ -207,7 +207,7 @@ static void filter_spec_append_urlencode(
 	struct strbuf buf = STRBUF_INIT;
 	strbuf_addstr_urlencode(&buf, raw, allow_unencoded);
 	trace_printf("Add to combine filter-spec: %s\n", buf.buf);
-	string_list_append(&filter->filter_spec, strbuf_detach(&buf, NULL));
+	string_list_append_nodup(&filter->filter_spec, strbuf_detach(&buf, NULL));
 }
 
 /*
@@ -226,12 +226,13 @@ static void transform_to_combine_type(
 			xcalloc(initial_sub_alloc, sizeof(*sub_array));
 		sub_array[0] = *filter_options;
 		memset(filter_options, 0, sizeof(*filter_options));
+		string_list_init_dup(&filter_options->filter_spec);
 		filter_options->sub = sub_array;
 		filter_options->sub_alloc = initial_sub_alloc;
 	}
 	filter_options->sub_nr = 1;
 	filter_options->choice = LOFC_COMBINE;
-	string_list_append(&filter_options->filter_spec, xstrdup("combine:"));
+	string_list_append(&filter_options->filter_spec, "combine:");
 	filter_spec_append_urlencode(
 		filter_options,
 		list_objects_filter_spec(&filter_options->sub[0]));
@@ -256,8 +257,14 @@ void parse_list_objects_filter(
 	struct strbuf errbuf = STRBUF_INIT;
 	int parse_error;
 
+	if (!filter_options->filter_spec.strdup_strings) {
+		if (filter_options->filter_spec.nr)
+			BUG("unexpected non-allocated string in filter_spec");
+		filter_options->filter_spec.strdup_strings = 1;
+	}
+
 	if (!filter_options->choice) {
-		string_list_append(&filter_options->filter_spec, xstrdup(arg));
+		string_list_append(&filter_options->filter_spec, arg);
 
 		parse_error = gently_parse_list_objects_filter(
 			filter_options, arg, &errbuf);
@@ -268,7 +275,7 @@ void parse_list_objects_filter(
 		 */
 		transform_to_combine_type(filter_options);
 
-		string_list_append(&filter_options->filter_spec, xstrdup("+"));
+		string_list_append(&filter_options->filter_spec, "+");
 		filter_spec_append_urlencode(filter_options, arg);
 		ALLOC_GROW_BY(filter_options->sub, filter_options->sub_nr, 1,
 			      filter_options->sub_alloc);
@@ -306,7 +313,7 @@ const char *list_objects_filter_spec(struct list_objects_filter_options *filter)
 		strbuf_add_separated_string_list(
 			&concatted, "", &filter->filter_spec);
 		string_list_clear(&filter->filter_spec, /*free_util=*/0);
-		string_list_append(
+		string_list_append_nodup(
 			&filter->filter_spec, strbuf_detach(&concatted, NULL));
 	}
 
@@ -321,7 +328,7 @@ const char *expand_list_objects_filter_spec(
 		strbuf_addf(&expanded_spec, "blob:limit=%lu",
 			    filter->blob_limit_value);
 		string_list_clear(&filter->filter_spec, /*free_util=*/0);
-		string_list_append(
+		string_list_append_nodup(
 			&filter->filter_spec,
 			strbuf_detach(&expanded_spec, NULL));
 	}
@@ -418,6 +425,7 @@ void list_objects_filter_copy(
 	string_list_init_dup(&dest->filter_spec);
 	for_each_string_list_item(item, &src->filter_spec)
 		string_list_append(&dest->filter_spec, item->string);
+	dest->sparse_oid_name = xstrdup_or_null(src->sparse_oid_name);
 
 	ALLOC_ARRAY(dest->sub, dest->sub_alloc);
 	for (i = 0; i < src->sub_nr; i++)

repo-settings.c

@@ -22,7 +22,7 @@ void prepare_repo_settings(struct repository *r)
 {
 	int experimental;
 	int value;
-	char *strval;
+	const char *strval;
 	int manyfiles;
 
 	if (!r->gitdir)
@@ -77,7 +77,7 @@ void prepare_repo_settings(struct repository *r)
 	if (!repo_config_get_int(r, "index.version", &value))
 		r->settings.index_version = value;
 
-	if (!repo_config_get_string(r, "core.untrackedcache", &strval)) {
+	if (!repo_config_get_string_tmp(r, "core.untrackedcache", &strval)) {
 		int v = git_parse_maybe_bool(strval);
 
 		/*
@@ -88,10 +88,9 @@ void prepare_repo_settings(struct repository *r)
 		if (v >= 0)
 			r->settings.core_untracked_cache = v ?
 				UNTRACKED_CACHE_WRITE : UNTRACKED_CACHE_REMOVE;
-		free(strval);
 	}
 
-	if (!repo_config_get_string(r, "fetch.negotiationalgorithm", &strval)) {
+	if (!repo_config_get_string_tmp(r, "fetch.negotiationalgorithm", &strval)) {
 		int fetch_default = r->settings.fetch_negotiation_algorithm;
 		if (!strcasecmp(strval, "skipping"))
 			r->settings.fetch_negotiation_algorithm = FETCH_NEGOTIATION_SKIPPING;

transport.c

@@ -386,7 +386,8 @@ static int fetch_refs_via_pack(struct transport *transport,
 	args.cloning = transport->cloning;
 	args.update_shallow = data->options.update_shallow;
 	args.from_promisor = data->options.from_promisor;
-	args.filter_options = data->options.filter_options;
+	list_objects_filter_copy(&args.filter_options,
+				 &data->options.filter_options);
 	args.refetch = data->options.refetch;
 	args.stateless_rpc = transport->stateless_rpc;
 	args.server_options = transport->server_options;
@@ -453,6 +454,7 @@ static int fetch_refs_via_pack(struct transport *transport,
 
 	free_refs(refs_tmp);
 	free_refs(refs);
+	list_objects_filter_release(&args.filter_options);
 	return ret;
 }
 
@@ -893,6 +895,7 @@ static int disconnect_git(struct transport *transport)
 		finish_connect(data->conn);
 	}
 
+	list_objects_filter_release(&data->options.filter_options);
 	free(data);
 	return 0;
 }