From 5c756684ba781c48b3a8f858c4c6299c848c86de Mon Sep 17 00:00:00 2001
From: Daniel Stenberg <daniel@haxx.se>
Date: Fri, 24 Apr 2026 08:11:10 +0200
Subject: [PATCH] hostip: init the curl_jmpenv_lock appropriately

A zero-initialized static value is not guaranteed to be a valid mutex on
all POSIX implementations

Spotted by Codex Security

Closes #21432
---
 lib/hostip.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/lib/hostip.c b/lib/hostip.c
index 48942d4bda..e547a8e450 100644
--- a/lib/hostip.c
+++ b/lib/hostip.c
@@ -201,7 +201,7 @@ void Curl_printable_address(const struct Curl_addrinfo *ai, char *buf,
    return address that we can jump back to from inside a signal handler. This
    is not thread-safe stuff. */
 static sigjmp_buf curl_jmpenv;
-static curl_simple_lock curl_jmpenv_lock;
+static curl_simple_lock curl_jmpenv_lock = CURL_SIMPLE_LOCK_INIT;
 #endif
 
 #ifdef USE_IPV6