From 1f263434a6db9359a9ffd11f590ff2476fb03c46 Mon Sep 17 00:00:00 2001
From: David Cermak <cermak@espressif.com>
Date: Mon, 9 Dec 2019 11:29:19 +0100
Subject: [PATCH] mdns: fixed crash on event during deinit

mdns library deinitialization destroys internal structures including action queue. if an event (e.g. network update) received
after some essential stucture is destoyed, an unexpected behavour might be introduced (e.g. crash of adding the event notification
to the action queue which was already destroyed

Closes WIFI-1485
---
 components/mdns/mdns.c | 8 +++++---
 1 file changed, 5 insertions(+), 3 deletions(-)

diff --git a/components/mdns/mdns.c b/components/mdns/mdns.c
index 6ce73c24c..92875a0a7 100644
--- a/components/mdns/mdns.c
+++ b/components/mdns/mdns.c
@@ -4249,6 +4249,11 @@ void mdns_free()
     if (!_mdns_server) {
         return;
     }
+
+    esp_event_handler_unregister(WIFI_EVENT, ESP_EVENT_ANY_ID, &event_handler);
+    esp_event_handler_unregister(IP_EVENT, ESP_EVENT_ANY_ID, &event_handler);
+    esp_event_handler_unregister(ETH_EVENT, ESP_EVENT_ANY_ID, &event_handler);
+
     mdns_service_remove_all(_mdns_server);
     _mdns_service_task_stop();
     for (i=0; i<TCPIP_ADAPTER_IF_MAX; i++) {
@@ -4279,9 +4284,6 @@ void mdns_free()
         free(h);
     }
     vSemaphoreDelete(_mdns_server->lock);
-    esp_event_handler_unregister(WIFI_EVENT, ESP_EVENT_ANY_ID, &event_handler);
-    esp_event_handler_unregister(IP_EVENT, ESP_EVENT_ANY_ID, &event_handler);
-    esp_event_handler_unregister(ETH_EVENT, ESP_EVENT_ANY_ID, &event_handler);
     free(_mdns_server);
     _mdns_server = NULL;
 }