[php-src] Issue #24616: fsockopen()/stream_socket_client() accept TCP ports above 65535, which wrap to another port

Issue: https://github.com/php/php-src/issues/24616 Author: Marti2203 ### Description A TCP port number above 65535 is not rejected by fsockopen() or stream_socket_client(): it wraps modulo 65536 and the connection goes to a different port. parse_ip_address_ex() in main/streams/xp_socket.c reads the port with atoi() and stores it without a range check. The following code: ```php <?php $srv = stream_socket_server("tcp://127.0.0.1:0"); $name = stream_socket_get_name($srv, false); $port = (int)substr($name, strrpos($name, ':') + 1); $c = stream_socket_client("tcp://127.0.0.1:" . ($port + 65536)); echo "asked for ", $port + 65536, ", connected to ", stream_socket_get_name($c, true), "\n"; $c2 = fsockopen("127.0.0.1", $port + 65536); echo "fsockopen connected to ", stream_socket_get_name($c2, true), "\n"; ``` Resulted in this output: ``` asked for 99735, connected to 127.0.0.1:34199 fsockopen connected to 127.0.0.1:34199 ``` But I expected this output instead: both calls fail with an invalid port error, since 99735 is not a valid TCP port (parse_url() already rejects such ports). Reproduced on 8.2.34-dev (512c04e39f) and 8.4.28-dev; master has the same atoi() calls (xp_socket.c lines 654 and 664). This issue was found by an LLM-Enhanced Static Analysis Engine and verified manually. ### PHP Version ``` PHP 8.4.28-dev, PHP 8.2.34-dev ``` ### Operating System Linux (Ubuntu 20.04, x86_64)