From 7af91ec49050d3129cccb216898c16af459e661d Mon Sep 17 00:00:00 2001
From: David Cermak <cermak@espressif.com>
Date: Fri, 17 Dec 2021 15:17:58 +0100
Subject: [PATCH] mdns: Fix potential null deref for ANY query type

* Original commit: espressif/esp-idf@99dd8eedb1a0e957f5f74344e3e4172e61c29ef8
---
 components/mdns/mdns.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/components/mdns/mdns.c b/components/mdns/mdns.c
index 0faa0b509..f63037fe9 100644
--- a/components/mdns/mdns.c
+++ b/components/mdns/mdns.c
@@ -4170,7 +4170,7 @@ static mdns_search_once_t * _mdns_search_find_from(mdns_search_once_t * s, mdns_
                 continue;
             }
             if (s->type != MDNS_TYPE_PTR) {
-                if (!strcasecmp(name->host, s->instance)) {
+                if (s->instance && strcasecmp(name->host, s->instance) == 0) {
                     return s;
                 }
                 s = s->next;