(legacy) fix media selection in interfaces.php

src/www/interfaces.php

@@ -1323,8 +1323,10 @@ if (isset($a_interfaces[$if]['wireless'])) {
 
 // Find all possible media options for the interface
 $mediaopts_list = array();
-exec("/sbin/ifconfig -m {$pconfig['if']} | grep \"media \"", $mediaopts);
-foreach ($mediaopts as $mediaopt){
+$optlist_intf = get_parent_interface($pconfig['if']);
+if (count($optlist_intf) > 0) {
+    exec("/sbin/ifconfig -m {$optlist_intf[0]} | grep \"media \"", $mediaopts);
+    foreach ($mediaopts as $mediaopt){
         preg_match("/media (.*)/", $mediaopt, $matches);
         if (preg_match("/(.*) mediaopt (.*)/", $matches[1], $matches1)){
             // there is media + mediaopt like "media 1000baseT mediaopt full-duplex"
@@ -1333,6 +1335,7 @@ foreach ($mediaopts as $mediaopt){
             // there is only media like "media 1000baseT"
             array_push($mediaopts_list, $matches[1]);
         }
+    }
 }
 
 include("head.inc");