Index: modules/filter/filter.module
===================================================================
RCS file: /cvs/drupal/drupal/modules/filter/filter.module,v
retrieving revision 1.362
diff -u -p -r1.362 filter.module
--- modules/filter/filter.module	14 Jan 2011 08:33:46 -0000	1.362
+++ modules/filter/filter.module	10 Feb 2011 08:40:14 -0000
@@ -1603,7 +1603,7 @@ function _filter_autop($text) {
   foreach ($chunks as $i => $chunk) {
     if ($i % 2) {
       // Opening or closing tag?
-      $open = ($chunk[1] != '/' || $chunk[1] != '!');
+      $open = ($chunk[1] != '/' && $chunk[1] != '!');
       $comment = (substr($chunk, 0, 4) == '<!--');
       list($tag) = preg_split('/[ >]/', substr($chunk, 2 - $open), 2);
       if (!$ignore) {