From: Günther Kelleter <guenther.kelleter@devolo.de>
Date: Thu, 3 Nov 2016 12:40:53 +0000 (+0100)
Subject: system-linux: check for open failure
X-Git-Url: http://git.archive.openwrt.org/?p=project%2Fnetifd.git;a=commitdiff_plain;h=6cf66bb0a02f3993394c0408c2865bfaf2756f21

system-linux: check for open failure

Signed-off-by: Günther Kelleter <guenther.kelleter@devolo.de>
---

diff --git a/system-linux.c b/system-linux.c
index 6e4a194..a038987 100644
--- a/system-linux.c
+++ b/system-linux.c
@@ -2489,6 +2489,8 @@ int system_update_ipv6_mtu(struct device *dev, int mtu)
 			dev->ifname);
 
 	int fd = open(buf, O_RDWR);
+	if (fd < 0)
+		return ret;
 
 	if (!mtu) {
 		ssize_t len = read(fd, buf, sizeof(buf) - 1);