From 73705b71fab865020acbd8a480868cf39239731b Mon Sep 17 00:00:00 2001
From: desertwitch <24509509+desertwitch@users.noreply.github.com>
Date: Sun, 8 Sep 2024 20:21:18 +0200
Subject: [PATCH] dynamix/include/SysDevs.php: fix PHP warnings

test for exec-returned variable existence before usage
---
 emhttp/plugins/dynamix/include/SysDevs.php | 16 ++++++++++------
 1 file changed, 10 insertions(+), 6 deletions(-)

diff --git a/emhttp/plugins/dynamix/include/SysDevs.php b/emhttp/plugins/dynamix/include/SysDevs.php
index cf5d90905..32fbddb22 100644
--- a/emhttp/plugins/dynamix/include/SysDevs.php
+++ b/emhttp/plugins/dynamix/include/SysDevs.php
@@ -75,9 +75,11 @@ case 't1':
     foreach ($devicelist as $line) {
       if (!empty($line)) {
         exec('udevadm info --path=$(udevadm info -q path /dev/'.$line.' | cut -d / -f 1-7) --query=path',$linereturn);
-        preg_match_all($DBDF_PARTIAL_REGEX, $linereturn[0], $inuse);
-        foreach ($inuse[0] as $line) {
-          $lines[] = $line;
+        if(isset($linereturn[0])) {
+          preg_match_all($DBDF_PARTIAL_REGEX, $linereturn[0], $inuse);
+          foreach ($inuse[0] as $line) {
+            $lines[] = $line;
+          }
         }
         unset($inuse);
         unset($linereturn);
@@ -92,9 +94,11 @@ case 't1':
           foreach ($nics as $line) {
             if (!empty($line)) {
               exec('readlink /sys/class/net/'.$line,$linereturn);
-              preg_match_all($DBDF_PARTIAL_REGEX, $linereturn[0], $inuse);
-              foreach ($inuse[0] as $line) {
-                $lines[] = $line;
+              if(isset($linereturn[0])) {
+                preg_match_all($DBDF_PARTIAL_REGEX, $linereturn[0], $inuse);
+                foreach ($inuse[0] as $line) {
+                  $lines[] = $line;
+                }
               }
               unset($inuse);
               unset($linereturn);