From 015f1c7de40839b6681b7dde7371093319c22e64 Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Vladim=C3=ADr=20Marek?= <vlmarek13@gmail.com>
Date: Wed, 11 Mar 2026 10:46:51 +0100
Subject: [PATCH] hostip: clear the sockaddr_in6 structure before use

On Solaris this was causing intermittent issues when the private
structure member __sin6_src_id had unexpectedly some value. connect(2)
would then fail with EADDRNOTAVAIL.

Closes #20885
---
 lib/hostip.c | 1 +
 1 file changed, 1 insertion(+)

diff --git a/lib/hostip.c b/lib/hostip.c
index 542b655b11..135c02b718 100644
--- a/lib/hostip.c
+++ b/lib/hostip.c
@@ -680,6 +680,7 @@ static struct Curl_addrinfo *get_localhost6(int port, const char *name)
   if(!ca)
     return NULL;
 
+  memset(&sa6, 0, sizeof(sa6));
   sa6.sin6_family = AF_INET6;
   sa6.sin6_port = htons(port16);
   sa6.sin6_flowinfo = 0;