From 4f374c45d9bdefc410fd5f372ef395688f3c5ca7 Mon Sep 17 00:00:00 2001
From: Andrei Zeliankou <zelenkov@nginx.com>
Date: Wed, 31 Jan 2024 15:23:10 +0000
Subject: [PATCH] Initialize port_impl only when it is needed

Found by UndefinedBehaviorSanitizer.

Reviewed-by: Andrew Clayton <a.clayton@nginx.com>
---
 src/nxt_unit.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/src/nxt_unit.c b/src/nxt_unit.c
index b6291b2da..1fc9acd8d 100644
--- a/src/nxt_unit.c
+++ b/src/nxt_unit.c
@@ -1483,9 +1483,9 @@ nxt_unit_request_check_response_port(nxt_unit_request_info_t *req,
     pthread_mutex_lock(&lib->mutex);
 
     port = nxt_unit_port_hash_find(&lib->ports, port_id, 0);
-    port_impl = nxt_container_of(port, nxt_unit_port_impl_t, port);
 
     if (nxt_fast_path(port != NULL)) {
+        port_impl = nxt_container_of(port, nxt_unit_port_impl_t, port);
         req->response_port = port;
 
         if (nxt_fast_path(port_impl->ready)) {