Ticket #46800: bad_id3_patch.diff

wp-admin/includes/media.php

@@ -3260 +3260 @@
 }
 
 /**
+ * Sanitizes metadata extracted from media files.
+ *
+ * Currently only binary strings are sanitized with focus on preventing propagation of
+ * bad character encodings from causing database calls and API endpoints to fail.
+ *
+ * @param array $metadata An existing array with data
+ *
+ * @return array Returns array of sanitized metadata.
+ */
+function wp_sanitize_media_metadata( $metadata ) {
+        if ( ! is_array( $metadata ) ) {
+                return $metadata;
+        }
+        foreach ( $metadata as $name => $value ) {
+                if ( ! is_string( $value ) ) {
+                        continue;
+                }
+                if ( is_array( $value ) ) {
+                        $value = wp_sanitize_media_metadata( $value );
+                } elseif ( is_string( $value ) && preg_match('~[^\x20-\x7E\t\r\n]~', $value ) > 0 ) {
+                        $encoding = mb_detect_encoding( $value, 'ISO-8859-1, UCS-2' );
+                        $value = $encoding ? mb_convert_encoding( $value, 'UTF-8', $encoding ) : utf8_encode( $value );
+                }
+                $metadata[$name] = $value;
+        }
+        return $metadata;
+}
+
+/**
  * Retrieve metadata from a video file's ID3 tags
  *
  * @since 3.6.0
@@ -3341 +3370 @@
 
         $file_format = isset( $metadata['fileformat'] ) ? $metadata['fileformat'] : null;
 
+        $metadata = wp_sanitize_media_metadata( $metadata );
+
         /**
          * Filters the array of metadata retrieved from a video.
          *
@@ -3412 +3443 @@
 
         wp_add_id3_tag_data( $metadata, $data );
 
+        $metadata = wp_sanitize_media_metadata( $metadata );
+        
         return $metadata;
 }