From 24dd825ed54495a441ca6ffeae471192c5a334ec Mon Sep 17 00:00:00 2001
From: Stefan Eissing <stefan@eissing.org>
Date: Tue, 22 Apr 2025 11:02:41 +0200
Subject: [PATCH] cares: fix missing lazy init for CURLOPT_DNS_SERVERS

When setting option CURLOPT_DNS_SERVERS, the ares channel was not
properly initialized and the setting failed.

Fixes #17119
Reported-by: calvin2021y on github
Closes #17127
---
 lib/asyn-ares.c | 4 ++++
 1 file changed, 4 insertions(+)

diff --git a/lib/asyn-ares.c b/lib/asyn-ares.c
index 80efeeb37c..147b4a743e 100644
--- a/lib/asyn-ares.c
+++ b/lib/asyn-ares.c
@@ -816,6 +816,10 @@ CURLcode Curl_set_dns_servers(struct Curl_easy *data,
   }
 
 #ifdef HAVE_CARES_SERVERS_CSV
+  result = async_ares_init_lazy(data);
+  if(result)
+    return result;
+
 #ifdef HAVE_CARES_PORTS_CSV
   ares_result = ares_set_servers_ports_csv(ares->channel, servers);
 #else