From 2324dfb3a955035ba503b6b712506e5a73caee51 Mon Sep 17 00:00:00 2001
From: Arvo Heinonen <arvo@skylo.tech>
Date: Fri, 25 Jul 2025 16:53:33 +0300
Subject: [PATCH] Fix msg_len parameter type

Incorrectly using int instead of Py_ssize_t for "s#"
caused PyArg_ParseTuple to overflow and overwrite
the fd parameter.
---
 _sctp.c | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/_sctp.c b/_sctp.c
index aa0dca7..fa1493a 100644
--- a/_sctp.c
+++ b/_sctp.c
@@ -1663,7 +1663,8 @@ static PyObject* getladdrs(PyObject* dummy, PyObject* args)
 
 static PyObject* sctp_send_msg(PyObject* dummy, PyObject* args)
 {
-	int fd, msg_len, size_sent, ppid, flags, stream, ttl, context;
+	Py_ssize_t msg_len;
+	int fd, size_sent, ppid, flags, stream, ttl, context;
 	const char *msg;
 	char *to;
 	int port;