From 57bd6aa7019734f599e23bdd75d6a75629df3aa6 Mon Sep 17 00:00:00 2001
From: Yu Watanabe <watanabe.yu+github@gmail.com>
Date: Thu, 10 Jun 2021 18:16:28 +0900
Subject: [PATCH] netlink: check input name is valid before calling netlink
 method

---
 src/libsystemd/sd-netlink/netlink-util.c | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/src/libsystemd/sd-netlink/netlink-util.c b/src/libsystemd/sd-netlink/netlink-util.c
index 0650f0b4752..4012725f4cd 100644
--- a/src/libsystemd/sd-netlink/netlink-util.c
+++ b/src/libsystemd/sd-netlink/netlink-util.c
@@ -274,6 +274,9 @@ int rtnl_resolve_link_alternative_name(sd_netlink **rtnl, const char *name) {
 
         assert(name);
 
+        if (!ifname_valid_full(name, IFNAME_VALID_ALTERNATIVE))
+                return -EINVAL;
+
         if (!rtnl)
                 rtnl = &our_rtnl;
         if (!*rtnl) {