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From: YOKOTA Hiroshi <yokota.hgml@gmail.com>
Date: Sun, 23 Oct 2022 01:57:14 +0900
Subject: Return None if IP address string is None
"ip_address" parameter is None when content server config value
"listen_on" is blank string.
---
src/calibre/utils/mdns.py | 3 +++
1 file changed, 3 insertions(+)
diff --git a/src/calibre/utils/mdns.py b/src/calibre/utils/mdns.py
index 051e505..4233a3e 100644
--- a/src/calibre/utils/mdns.py
+++ b/src/calibre/utils/mdns.py
@@ -77,6 +77,9 @@ def _get_external_ip():
def verify_ipV4_address(ip_address):
+ if ip_address == None:
+ return None
+
result = None
if ip_address != '0.0.0.0' and ip_address != '::':
# do some more sanity checks on the address
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