From c9e04ae0f7969400f74c72cb5760a1ca8f75eb65 Mon Sep 17 00:00:00 2001
From: Per von Zweigbergk <pvz@itassistans.se>
Date: Sat, 13 Aug 2016 16:42:24 +0000
Subject: [PATCH] (get_interface_list) Properly handle an interface not
 appearing in dmesg

---
 src/etc/inc/util.inc | 11 ++++++-----
 1 file changed, 6 insertions(+), 5 deletions(-)

diff --git a/src/etc/inc/util.inc b/src/etc/inc/util.inc
index 7daee917b..26a8ee0dd 100644
--- a/src/etc/inc/util.inc
+++ b/src/etc/inc/util.inc
@@ -948,12 +948,13 @@ function get_interface_list($only_active = false)
         }
 
         $dmesg_arr = array();
+        $toput['dmesg'] = null;
         exec("/sbin/dmesg |grep $ifname", $dmesg_arr);
-        preg_match_all("/<(.*?)>/i", $dmesg_arr[0], $dmesg);
-        if (isset($dmesg[1][0])) {
-            $toput['dmesg'] = $dmesg[1][0];
-        } else {
-            $toput['dmesg'] = null;
+        if (count($dmesg_arr) > 0) {
+            preg_match_all("/<(.*?)>/i", $dmesg_arr[0], $dmesg);
+            if (isset($dmesg[1][0])) {
+                $toput['dmesg'] = $dmesg[1][0];
+            }
         }
 
         $iflist[$ifname] = $toput;