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security: fix JSON injection in native-protocol-tcp address

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The listen address was inserted into JSON without escaping. Build the
address string first, then encode it with spa_json_encode_string to
prevent injection of arbitrary JSON keys.

Co-Authored-By: Claude Opus 4.7 <noreply@anthropic.com>
This commit is contained in:
Wim Taymans 2026-04-29 17:52:19 +02:00
parent c5c2d197dc
commit 1b8962d7c2
1 changed files with 7 additions and 2 deletions
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9
src/modules/module-protocol-pulse/modules/module-native-protocol-tcp.c
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@ -2,6 +2,7 @@
/* SPDX-FileCopyrightText: Copyright © 2021 Wim Taymans <wim.taymans@gmail.com> */
/* SPDX-License-Identifier: MIT */
#include <spa/utils/json.h>
#include <pipewire/pipewire.h>
#include "../module.h"
@ -78,6 +79,7 @@ static int module_native_protocol_tcp_prepare(struct module * const module)
struct module_native_protocol_tcp_data * const d = module->user_data;
struct pw_properties * const props = module->props;
const char *port, *listen, *auth;
char address[1024], encoded[1024];
FILE *f;
char *args;
size_t size;
@ -95,9 +97,12 @@ static int module_native_protocol_tcp_prepare(struct module * const module)
if (f == NULL)
return -errno;
snprintf(address, sizeof(address), "tcp:%s%s%s",
listen ? listen : "", listen ? ":" : "", port);
spa_json_encode_string(encoded, sizeof(encoded), address);
fprintf(f, "[ { ");
fprintf(f, " \"address\": \"tcp:%s%s%s\" ",
listen ? listen : "", listen ? ":" : "", port);
fprintf(f, " \"address\": %s ", encoded);
if (auth && module_args_parse_bool(auth))
fprintf(f, " \"client.access\": \"unrestricted\" ");
fprintf(f, "} ]");