Ticket #34938: wp_tempnam-too-long-file-name.patch

wp-admin/includes/file.php

@@ -184 +184 @@
         // Suffix some random data to avoid filename conflicts
         $temp_filename .= '-' . wp_generate_password( 6, false );
         $temp_filename .= '.tmp';
-        $temp_filename = $dir . wp_unique_filename( $dir, $temp_filename );
 
+        $new_base_name = wp_unique_filename( $dir, $temp_filename );
+        if ( strlen( $new_base_name ) > 255 ) {
+                return wp_tempnam( '', $dir);
+        }
+
+        $temp_filename = $dir . $new_base_name;
         $fp = @fopen( $temp_filename, 'x' );
         if ( ! $fp && is_writable( $dir ) && file_exists( $temp_filename ) ) {
                 return wp_tempnam( $filename, $dir );