From 6e77c4d1b41e0a4be65979ef6b2176bc67c66a4a Mon Sep 17 00:00:00 2001
From: Eric Leblond <eric@regit.org>
Date: Thu, 10 Apr 2014 11:05:46 +0200
Subject: [PATCH] util-ioctl: only get MTU when iface name is set

This patch fixes a warning message when suricata is started without
giving an interface name on the command line. The code was trying
to get the MTU even if pcap_dev was not set.
---
 src/util-ioctl.c | 7 ++++++-
 1 file changed, 6 insertions(+), 1 deletion(-)

diff --git a/src/util-ioctl.c b/src/util-ioctl.c
index 4b2923a32b..0f144ec511 100644
--- a/src/util-ioctl.c
+++ b/src/util-ioctl.c
@@ -117,7 +117,12 @@ int GetIfaceMTU(char *pcap_dev)
 int GetIfaceMaxPacketSize(char *pcap_dev)
 {
     int ll_header = GetIfaceMaxHWHeaderLength(pcap_dev);
-    int mtu = GetIfaceMTU(pcap_dev);
+    int mtu = 0;
+
+    if ((pcap_dev == NULL) || strlen(pcap_dev) == 0)
+        return 0;
+
+    mtu = GetIfaceMTU(pcap_dev);
     switch (mtu) {
         case 0:
         case -1: