From 209c5080e6dc64ee676f790eeaa65e204e978fc8 Mon Sep 17 00:00:00 2001
From: Hans Dedecker <dedeckeh@gmail.com>
Date: Sat, 14 Apr 2018 21:05:25 +0200
Subject: [PATCH] system-linux: fix segfault on alloc failure in
 system_if_check()

Detected by Coverity in CID 1433686

Signed-off-by: Hans Dedecker <dedeckeh@gmail.com>
---
 system-linux.c | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/system-linux.c b/system-linux.c
index b839b4c..9933201 100644
--- a/system-linux.c
+++ b/system-linux.c
@@ -1571,6 +1571,9 @@ int system_if_check(struct device *dev)
 	};
 	int ret = 1;
 
+	if (!cb)
+		return ret;
+
 	msg = nlmsg_alloc_simple(RTM_GETLINK, 0);
 	if (!msg)
 		goto out;
-- 
2.25.1