From a808233ee7fe929f60c3aaf9632341daccc14a30 Mon Sep 17 00:00:00 2001
From: Victor Dubiniuk <victor.dubiniuk@gmail.com>
Date: Wed, 1 Feb 2017 00:30:01 +0300
Subject: [PATCH] Check if color exists in palette before using it

Signed-off-by: Lukas Reschke <lukas@statuscode.ch>
---
 lib/private/image.php | 6 +++---
 1 file changed, 3 insertions(+), 3 deletions(-)

diff --git a/lib/private/image.php b/lib/private/image.php
index 225266f6787..0683ce1d18c 100644
--- a/lib/private/image.php
+++ b/lib/private/image.php
@@ -738,12 +738,12 @@ class OC_Image implements \OCP\IImage {
 						break;
 					case 8:
 						$color = @unpack('n', $vide . substr($data, $p, 1));
-						$color[1] = $palette[$color[1] + 1];
+						$color[1] = (isset($palette[$color[1] + 1])) ? $palette[$color[1] + 1] : $palette[1];
 						break;
 					case 4:
 						$color = @unpack('n', $vide . substr($data, floor($p), 1));
 						$color[1] = ($p * 2) % 2 == 0 ? $color[1] >> 4 : $color[1] & 0x0F;
-						$color[1] = $palette[$color[1] + 1];
+						$color[1] = (isset($palette[$color[1] + 1])) ? $palette[$color[1] + 1] : $palette[1];
 						break;
 					case 1:
 						$color = @unpack('n', $vide . substr($data, floor($p), 1));
@@ -773,7 +773,7 @@ class OC_Image implements \OCP\IImage {
 								$color[1] = ($color[1] & 0x1);
 								break;
 						}
-						$color[1] = $palette[$color[1] + 1];
+						$color[1] = (isset($palette[$color[1] + 1])) ? $palette[$color[1] + 1] : $palette[1];
 						break;
 					default:
 						fclose($fh);