From 2d294ae8f781bb0eafaff5e927f522c0b20dc983 Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Vin=C3=ADcius=20Ferr=C3=A3o?=
 <2031761+viniciusferrao@users.noreply.github.com>
Date: Tue, 21 Jul 2026 14:59:01 -0300
Subject: [PATCH] fix(NetworkUtils): guard formatNetmask against an undefined
 mask

formatNetmask() uses its first argument immediately (inet_aton($mask),
2**$mask, hex $mask) with no check that it is defined. Callers that pass an
undefined mask trigger "Use of uninitialized value" warnings and a
meaningless result instead of a clean failure.

Return undef up front when $mask is not defined.

Recovered from the unmerged lenovobuild branch (original acbbeb86).

Co-authored-by: Jarrod Johnson <10814490+jjohnson42@users.noreply.github.com>
---
 perl-xCAT/xCAT/NetworkUtils.pm | 1 +
 1 file changed, 1 insertion(+)

diff --git a/perl-xCAT/xCAT/NetworkUtils.pm b/perl-xCAT/xCAT/NetworkUtils.pm
index 9a0fbef1d..89a293472 100644
--- a/perl-xCAT/xCAT/NetworkUtils.pm
+++ b/perl-xCAT/xCAT/NetworkUtils.pm
@@ -1389,6 +1389,7 @@ sub formatNetmask
     my $origType = shift;
     my $newType  = shift;
     my $maskn;
+    if (not defined $mask) { return undef; }
     if ($origType == 0)
     {
         $maskn = unpack("N", inet_aton($mask));