cleanup: Check that onion IP/Port packing worked.

If it doesn't work for some reason, right now it would cause trouble
(e.g. buffer overrun).

Author: iphydf

toxcore/onion_announce.c

@@ -511,6 +511,11 @@ static int handle_announce_request_common(
     uint8_t ping_id_data[CRYPTO_PUBLIC_KEY_SIZE + SIZE_IPPORT];
     memcpy(ping_id_data, packet_public_key, CRYPTO_PUBLIC_KEY_SIZE);
     const int packed_len = pack_ip_port(onion_a->log, &ping_id_data[CRYPTO_PUBLIC_KEY_SIZE], SIZE_IPPORT, source);
+    if (packed_len < 0) {
+        LOGGER_ERROR(onion_a->log, "failed to pack IP/Port");
+        mem_delete(onion_a->mem, plain);
+        return 1;
+    }
     assert(packed_len <= SIZE_IPPORT);
     memzero(&ping_id_data[CRYPTO_PUBLIC_KEY_SIZE + packed_len], SIZE_IPPORT - packed_len);
     const uint8_t *data_public_key = plain + ONION_PING_ID_SIZE + CRYPTO_PUBLIC_KEY_SIZE;

toxcore/onion_client.c

@@ -580,6 +580,11 @@ static int new_sendback(Onion_Client *onion_c, uint32_t num, const uint8_t *publ
     memcpy(data, &num, sizeof(uint32_t));
     memcpy(&data[sizeof(uint32_t)], public_key, CRYPTO_PUBLIC_KEY_SIZE);
     const int packed_len = pack_ip_port(onion_c->logger, &data[sizeof(uint32_t) + CRYPTO_PUBLIC_KEY_SIZE], SIZE_IPPORT, ip_port);
+    if (packed_len < 0) {
+        LOGGER_ERROR(onion_c->logger, "failed to pack IP/port");
+        return -1;
+    }
+    assert(packed_len <= SIZE_IPPORT);
     memzero(&data[sizeof(uint32_t) + CRYPTO_PUBLIC_KEY_SIZE + packed_len], SIZE_IPPORT - packed_len);
     memcpy(&data[sizeof(uint32_t) + CRYPTO_PUBLIC_KEY_SIZE + SIZE_IPPORT], &path_num, sizeof(uint32_t));
     *sendback = ping_array_add(onion_c->announce_ping_array, onion_c->mono_time, onion_c->rng, data, sizeof(data));