1 files changed, 10 insertions, 6 deletions
diff --git a/phpBB/install/index.php b/phpBB/install/index.php
index 2be5adaaac..8514f34e09 100644
--- a/phpBB/install/index.php
+++ b/phpBB/install/index.php
@@ -73,6 +73,10 @@ else
 }
 @ini_set('memory_limit', $mem_limit);
 
+// In case $phpbb_adm_relative_path is not set (in case of an update), use the default.
+$phpbb_adm_relative_path = (isset($phpbb_adm_relative_path)) ? $phpbb_adm_relative_path : 'adm/';
+$phpbb_admin_path = (defined('PHPBB_ADMIN_PATH')) ? PHPBB_ADMIN_PATH : $phpbb_root_path . $phpbb_adm_relative_path;
+
 // Include essential scripts
 require($phpbb_root_path . 'includes/class_loader.' . $phpEx);
 
@@ -215,9 +219,9 @@ $phpbb_style_path_provider = new phpbb_style_path_provider();
 $template = new phpbb_template($phpbb_root_path, $phpEx, $config, $user, $phpbb_style_resource_locator, new phpbb_template_context());
 $phpbb_style = new phpbb_style($phpbb_root_path, $phpEx, $config, $user, $phpbb_style_resource_locator, $phpbb_style_path_provider, $template);
 $phpbb_style->set_ext_dir_prefix('adm/');
-$phpbb_style->set_custom_style('admin', '../adm/style', array(), '');
+$phpbb_style->set_custom_style('admin', $phpbb_admin_path . 'style', array(), '');
 $template->assign_var('T_ASSETS_PATH', '../assets');
-$template->assign_var('T_TEMPLATE_PATH', '../adm/style');
+$template->assign_var('T_TEMPLATE_PATH', $phpbb_admin_path . 'style');
 
 $install = new module();
 
@@ -361,7 +365,7 @@ class module
 		}
 
 		define('HEADER_INC', true);
-		global $template, $lang, $stage, $phpbb_root_path;
+		global $template, $lang, $stage, $phpbb_root_path, $phpbb_admin_path;
 
 		$template->assign_vars(array(
 			'L_CHANGE'				=> $lang['CHANGE'],
@@ -370,7 +374,7 @@ class module
 			'L_SELECT_LANG'			=> $lang['SELECT_LANG'],
 			'L_SKIP'				=> $lang['SKIP'],
 			'PAGE_TITLE'			=> $this->get_page_title(),
-			'T_IMAGE_PATH'			=> $phpbb_root_path . 'adm/images/',
+			'T_IMAGE_PATH'			=> htmlspecialchars($phpbb_admin_path) . 'images/',
 
 			'S_CONTENT_DIRECTION' 	=> $lang['DIRECTION'],
 			'S_CONTENT_FLOW_BEGIN'	=> ($lang['DIRECTION'] == 'ltr') ? 'left' : 'right',
@@ -551,7 +555,7 @@ class module
 	*/
 	function error($error, $line, $file, $skip = false)
 	{
-		global $lang, $db, $template;
+		global $lang, $db, $template, $phpbb_admin_path;
 
 		if ($skip)
 		{
@@ -573,7 +577,7 @@ class module
 		echo '<head>';
 		echo '<meta charset="utf-8">';
 		echo '<title>' . $lang['INST_ERR_FATAL'] . '</title>';
-		echo '<link href="../adm/style/admin.css" rel="stylesheet" type="text/css" media="screen" />';
+		echo '<link href="' . htmlspecialchars($phpbb_admin_path) . 'style/admin.css" rel="stylesheet" type="text/css" media="screen" />';
 		echo '</head>';
 		echo '<body id="errorpage">';
 		echo '<div id="wrap">';