From 87a2e6ccd7989f2b271f557c6303a4eb412a03cb Mon Sep 17 00:00:00 2001
From: Yu Watanabe <watanabe.yu+github@gmail.com>
Date: Tue, 16 May 2023 11:46:11 +0900
Subject: [PATCH] udev/net: verify ID_NET_XYZ before trying to assign it as an
 alternative name

(cherry picked from commit e65c6c1baa8ea905f7e5bad3b8486d509775ec6a)

Related: RHEL-5988
---
 src/udev/net/link-config.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/src/udev/net/link-config.c b/src/udev/net/link-config.c
index 5d28526527..4fcf373f8e 100644
--- a/src/udev/net/link-config.c
+++ b/src/udev/net/link-config.c
@@ -834,7 +834,7 @@ static int link_apply_alternative_names(Link *link, sd_netlink **rtnl) {
                         default:
                                 assert_not_reached();
                         }
-                        if (!isempty(n)) {
+                        if (ifname_valid_full(n, IFNAME_VALID_ALTERNATIVE)) {
                                 r = strv_extend(&altnames, n);
                                 if (r < 0)
                                         return log_oom();