From 3fd7c28695b1fca05dd1f4d8aa5fdcd68e4e5c40 Mon Sep 17 00:00:00 2001
From: Kovid Goyal <kovid@kovidgoyal.net>
Date: Mon, 18 Dec 2023 19:27:28 +0530
Subject: [PATCH] ...

---
 src/calibre/srv/loop.py | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/src/calibre/srv/loop.py b/src/calibre/srv/loop.py
index a82ffcce8e..531fc53602 100644
--- a/src/calibre/srv/loop.py
+++ b/src/calibre/srv/loop.py
@@ -145,7 +145,7 @@ def parse_trusted_ips(spec):
 
 
 def is_ip_trusted(remote_addr, trusted_ips):
-    remote_addr = getattr(remote_addr, 'ipv4_mapped', remote_addr)
+    remote_addr = getattr(remote_addr, 'ipv4_mapped', None) or remote_addr
     for tip in trusted_ips:
         if hasattr(tip, 'hosts'):
             if remote_addr in tip: