From b40daa2c5b1708f23f07a083e7aa9f9c2b0de93f Mon Sep 17 00:00:00 2001
From: Brad House <brad@brad-house.com>
Date: Tue, 28 May 2024 14:51:34 -0400
Subject: [PATCH] MacOS UBSAN: another workaround

---
 src/lib/ares_sysconfig_mac.c | 7 ++++++-
 1 file changed, 6 insertions(+), 1 deletion(-)

diff --git a/src/lib/ares_sysconfig_mac.c b/src/lib/ares_sysconfig_mac.c
index e19ab49e..421ae3a6 100644
--- a/src/lib/ares_sysconfig_mac.c
+++ b/src/lib/ares_sysconfig_mac.c
@@ -275,7 +275,12 @@ static ares_status_t read_resolvers(dns_resolver_t **resolvers, int nresolvers,
   for (i = 0; status == ARES_SUCCESS && i < nresolvers; i++) {
     const dns_resolver_t *resolver;
 
-    resolver = resolvers[i];
+    /* UBSAN doesn't like that this is unaligned, lets use memcpy to get the
+     * address, same as:
+     *   resolver = resolvers[i]
+     */
+    memcpy(&resolver, resolvers + i, sizeof(resolver));
+
     status   = read_resolver(resolver, sysconfig);
   }