Filesystem API: Don't attempt to extract invalid files from a zip when using the PclZip library.

This brings the handling inline with the same guard condition in `_unzip_file_ziparchive()` with ZipArchive.

Props johnbillion, peterwilsoncc, xknown.


git-svn-id: https://develop.svn.wordpress.org/trunk@61887 602fd350-edb4-49c9-b593-d223f7449a82

Author: johnbillion

src/wp-admin/includes/file.php

@@ -1895,6 +1895,11 @@ function _unzip_file_pclzip( $file, $to, $needed_dirs = array() ) {
 			continue;
 		}
 
+		// Don't extract invalid files:
+		if ( 0 !== validate_file( $archive_file['filename'] ) ) {
+			continue;
+		}
+
 		$uncompressed_size += $archive_file['size'];
 
 		$needed_dirs[] = $to . untrailingslashit( $archive_file['folder'] ? $archive_file['filename'] : dirname( $archive_file['filename'] ) );