From 03de74a728d4b278f55e1fc30e0425483b806e80 Mon Sep 17 00:00:00 2001
From: Suren Gabrielyan <suren.gabrielyan@espressif.com>
Date: Thu, 20 May 2021 12:25:15 +0400
Subject: [PATCH] mdns: Fix of crash when wifi interface get deleted and mdns
 receives the packets

Closes https://github.com/espressif/esp-idf/issues/6973
---
 components/mdns/mdns.c | 13 +++++++++++++
 1 file changed, 13 insertions(+)

diff --git a/components/mdns/mdns.c b/components/mdns/mdns.c
index 6d47084314..af3ef03d79 100644
--- a/components/mdns/mdns.c
+++ b/components/mdns/mdns.c
@@ -73,6 +73,17 @@ esp_netif_t *_mdns_get_esp_netif(mdns_if_t tcpip_if)
     return NULL;
 }
 
+
+/*
+ * @brief Clean internal mdns interface's pointer
+ */
+static inline void _mdns_clean_netif_ptr(mdns_if_t tcpip_if) {
+    if (tcpip_if < MDNS_IF_MAX) {
+        s_esp_netifs[tcpip_if] = NULL;
+    }
+}
+
+
 /*
  * @brief  Convert esp-netif handle to mdns if
  */
@@ -3133,6 +3144,8 @@ void _mdns_enable_pcb(mdns_if_t tcpip_if, mdns_ip_protocol_t ip_protocol)
  */
 void _mdns_disable_pcb(mdns_if_t tcpip_if, mdns_ip_protocol_t ip_protocol)
 {
+    _mdns_clean_netif_ptr(tcpip_if);
+
     if (_mdns_server->interfaces[tcpip_if].pcbs[ip_protocol].pcb) {
         _mdns_clear_pcb_tx_queue_head(tcpip_if, ip_protocol);
         _mdns_pcb_deinit(tcpip_if, ip_protocol);