From 766417bd763db913efdd9c48442b1094c23d7042 Mon Sep 17 00:00:00 2001
From: Yu Watanabe <watanabe.yu+github@gmail.com>
Date: Sat, 26 Nov 2022 09:57:16 +0900
Subject: [PATCH] sd-netlink: fix segfault

---
 src/libsystemd/sd-netlink/sd-netlink.c | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/src/libsystemd/sd-netlink/sd-netlink.c b/src/libsystemd/sd-netlink/sd-netlink.c
index 1202fe10a5..ec1035fdd1 100644
--- a/src/libsystemd/sd-netlink/sd-netlink.c
+++ b/src/libsystemd/sd-netlink/sd-netlink.c
@@ -593,7 +593,8 @@ int sd_netlink_read(
                                 return r;
 
                         if (type == NLMSG_DONE) {
-                                *ret = NULL;
+                                if (ret)
+                                        *ret = NULL;
                                 return 0;
                         }