[sanitize] In lookup sanitize don't try to access subtable 0 if it isn't there.

3 years ago · a75b96f7e5
parent 82a9f54410
commit a75b96f7e5
1 changed files with 1 additions and 1 deletions
--- a/src/hb-ot-layout-common.hh
+++ b/src/hb-ot-layout-common.hh
@ -1357,7 +1357,7 @@ struct Lookup
    if (unlikely (!get_subtables<TSubTable> ().sanitize (c, this, get_type ())))
      return_trace (false);

-    if (unlikely (get_type () == TSubTable::Extension && !c->get_edit_count ()))
+    if (unlikely (get_type () == TSubTable::Extension && subtables && !c->get_edit_count ()))
    {
      /* The spec says all subtables of an Extension lookup should
       * have the same type, which shall not be the Extension type