From 7fde77c45d50d92dd64ba91192af6a149b850d7f Mon Sep 17 00:00:00 2001
From: Mike Brady <4265913+mikebrady@users.noreply.github.com>
Date: Wed, 1 Sep 2021 16:39:32 +0100
Subject: [PATCH] lock the avahi thread before modifying the strings

---
 mdns_avahi.c | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/mdns_avahi.c b/mdns_avahi.c
index c4568078..95984419 100644
--- a/mdns_avahi.c
+++ b/mdns_avahi.c
@@ -334,6 +334,7 @@ static int avahi_update(char **txt_records, char **secondary_txt_records) {
   else
     selected_interface = AVAHI_IF_UNSPEC;
 
+  avahi_threaded_poll_lock(tpoll);
   if (txt_records != NULL) {
     if (text_record_string_list)
       avahi_string_list_free(text_record_string_list);
@@ -356,6 +357,8 @@ static int avahi_update(char **txt_records, char **secondary_txt_records) {
     if (err != 0)
       debug(1, "avahi_update error updating secondary txt records.");
   }
+
+  avahi_threaded_poll_unlock(tpoll);
   return 0;
 }