From 323b4702e0a39cb577f27d4887842dc8b62edddb Mon Sep 17 00:00:00 2001
From: James Thomas <jthomas.dev@protonmail.com>
Date: Tue, 3 Mar 2026 18:38:13 -0500
Subject: [PATCH 1/2] prevent double-free when closing an interface event
 listener

---
 include/udx.h | 2 ++
 src/udx.c     | 7 ++++++-
 2 files changed, 8 insertions(+), 1 deletion(-)

diff --git a/include/udx.h b/include/udx.h
index 666eb6b..5dd0554 100644
--- a/include/udx.h
+++ b/include/udx.h
@@ -513,6 +513,8 @@ struct udx_interface_event_s {
   uv_loop_t *loop;
   udx_t *udx;
 
+  bool closing;
+
   udx_interface_event_t *prev;
   udx_interface_event_t *next;
 
diff --git a/src/udx.c b/src/udx.c
index 5fded99..d03f28e 100644
--- a/src/udx.c
+++ b/src/udx.c
@@ -2667,7 +2667,7 @@ _stream_on_destroy_send (uv_udp_send_t *req, int status) {
 int
 udx_stream_destroy (udx_stream_t *stream) {
   if (stream->status & UDX_STREAM_CLOSED) {
-    debug_printf("udx: closing already closed stream %u", stream->local_id);
+    debug_printf("udx: closing already closed stream %u\n", stream->local_id);
     return 0;
   }
 
@@ -2827,6 +2827,7 @@ udx_interface_event_init (udx_t *udx, udx_interface_event_t *handle, udx_interfa
   handle->loop = udx->loop;
   handle->sorted = false;
   handle->on_close = cb;
+  handle->closing = false;
 
   int err = uv_interface_addresses(&(handle->addrs), &(handle->addrs_len));
   if (err < 0) return err;
@@ -2860,6 +2861,10 @@ udx_interface_event_stop (udx_interface_event_t *handle) {
 
 int
 udx_interface_event_close (udx_interface_event_t *handle) {
+  if (handle->closing) {
+    return 0;
+  }
+  handle->closing = true;
   handle->on_event = NULL;
 
   uv_free_interface_addresses(handle->addrs, handle->addrs_len);

From 3fc9578d093e455dae3c42b7f621957166518029 Mon Sep 17 00:00:00 2001
From: James Thomas <jthomas.dev@protonmail.com>
Date: Wed, 4 Mar 2026 01:23:58 -0500
Subject: [PATCH 2/2] return UV_EINVAL if udx_interface_event_close is called
 on a already-closed interface listener

---
 src/udx.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/src/udx.c b/src/udx.c
index d03f28e..7e2ab71 100644
--- a/src/udx.c
+++ b/src/udx.c
@@ -2862,7 +2862,7 @@ udx_interface_event_stop (udx_interface_event_t *handle) {
 int
 udx_interface_event_close (udx_interface_event_t *handle) {
   if (handle->closing) {
-    return 0;
+    return UV_EINVAL;
   }
   handle->closing = true;
   handle->on_event = NULL;