From aa19a6a90f7ef24df12eed205663f3cfbb7d8174 Mon Sep 17 00:00:00 2001
From: Arne Schwabe <arne@rfc2549.org>
Date: Tue, 21 Nov 2023 18:06:03 +0100
Subject: [PATCH] Add missing check for nl_socket_alloc failure

This can happen if the memory alloc fails.

Patch V2: add goto error
Patch V3: return -ENOMEM instead of going to error

Change-Id: Iee66caa794d267ac5f8bee584633352893047171
Signed-off-by: Arne Schwabe <arne@rfc2549.org>
Acked-by: Antonio Quartulli <antonio@openvpn.net>
Message-Id: <20231121170603.886801-1-arne@rfc2549.org>
URL: https://www.mail-archive.com/openvpn-devel@lists.sourceforge.net/msg27541.html
Signed-off-by: Gert Doering <gert@greenie.muc.de>
(cherry picked from commit d1c31e428120bb0fc9488c62c1691c92a37d94c3)
---
 src/openvpn/dco_linux.c | 6 ++++++
 1 file changed, 6 insertions(+)

diff --git a/src/openvpn/dco_linux.c b/src/openvpn/dco_linux.c
index b033f8543ea..3c91606b731 100644
--- a/src/openvpn/dco_linux.c
+++ b/src/openvpn/dco_linux.c
@@ -81,6 +81,12 @@ resolve_ovpn_netlink_id(int msglevel)
     int ret;
     struct nl_sock *nl_sock = nl_socket_alloc();
 
+    if (!nl_sock)
+    {
+        msg(msglevel, "Allocating net link socket failed");
+        return -ENOMEM;
+    }
+
     ret = genl_connect(nl_sock);
     if (ret)
     {