From f7fe057821a66548841f6efa504eec8569f0fc3a Mon Sep 17 00:00:00 2001
From: Simon Goldschmidt <goldsimon@gmx.de>
Date: Wed, 27 Sep 2023 21:28:29 +0200
Subject: [PATCH] win32 pcapif: fix "heap-use-after-free" on shutdown

---
 contrib/ports/win32/pcapif.c | 9 +++++++--
 1 file changed, 7 insertions(+), 2 deletions(-)

diff --git a/contrib/ports/win32/pcapif.c b/contrib/ports/win32/pcapif.c
index 58a42b4e..6bf58f02 100644
--- a/contrib/ports/win32/pcapif.c
+++ b/contrib/ports/win32/pcapif.c
@@ -679,12 +679,17 @@ pcapif_shutdown(struct netif *netif)
 #endif /* PCAPIF_RX_USE_THREAD */
     if (pa->adapter) {
       pcap_breakloop(pa->adapter);
-      pcap_close(pa->adapter);
     }
 #if PCAPIF_RX_USE_THREAD
     /* wait for rxthread to end */
-    while(pa->rx_running);
+    while (pa->rx_running) {
+      Sleep(100);
+    }
 #endif /* PCAPIF_RX_USE_THREAD */
+    if (pa->adapter) {
+      pcap_close(pa->adapter);
+      pa->adapter = NULL;
+    }
 #if PCAPIF_HANDLE_LINKSTATE
     pcapifh_linkstate_close(pa->link_state);
 #endif /* PCAPIF_HANDLE_LINKSTATE */