From: Hans Dedecker <dedeckeh@gmail.com>
Date: Sat, 14 Apr 2018 19:05:25 +0000 (+0200)
Subject: system-linux: fix segfault on alloc failure in system_if_check()
X-Git-Url: http://git.archive.openwrt.org/?p=project%2Fnetifd.git;a=commitdiff_plain;h=209c5080e6dc64ee676f790eeaa65e204e978fc8

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>
---

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;