[pango/harfbuzz-ng] [HB] Avoid infinite recusion in Extension sanitize()

[Behdad Esfahbod <behdad src gnome org>]

commit cb971493ec7013eaee032cbc6e3f399a413808fb
Author: Behdad Esfahbod <behdad behdad org>
Date:   Tue Aug 4 21:35:32 2009 -0400

    [HB] Avoid infinite recusion in Extension sanitize()

 pango/opentype/hb-ot-layout-gpos-private.hh |    1 +
 pango/opentype/hb-ot-layout-gsub-private.hh |    1 +
 2 files changed, 2 insertions(+), 0 deletions(-)
---
diff --git a/pango/opentype/hb-ot-layout-gpos-private.hh b/pango/opentype/hb-ot-layout-gpos-private.hh
index 4aaefeb..292de0d 100644
--- a/pango/opentype/hb-ot-layout-gpos-private.hh
+++ b/pango/opentype/hb-ot-layout-gpos-private.hh
@@ -1526,6 +1526,7 @@ inline bool ExtensionPos::sanitize (SANITIZE_ARG_DEF)
 {
   return Extension::sanitize (SANITIZE_ARG) &&
 	 (&(Extension::get_subtable ()) == &Null(LookupSubTable) ||
+	  get_type () == PosLookupSubTable::Extension ||
 	  DECONST_CAST (PosLookupSubTable, get_subtable (), 0).sanitize (SANITIZE_ARG));
 }
 
diff --git a/pango/opentype/hb-ot-layout-gsub-private.hh b/pango/opentype/hb-ot-layout-gsub-private.hh
index db608fd..9d35e99 100644
--- a/pango/opentype/hb-ot-layout-gsub-private.hh
+++ b/pango/opentype/hb-ot-layout-gsub-private.hh
@@ -863,6 +863,7 @@ inline bool ExtensionSubst::sanitize (SANITIZE_ARG_DEF)
 {
   return Extension::sanitize (SANITIZE_ARG) &&
 	 (&(Extension::get_subtable ()) == &Null(LookupSubTable) ||
+	  get_type () == SubstLookupSubTable::Extension ||
 	  DECONST_CAST (SubstLookupSubTable, get_subtable (), 0).sanitize (SANITIZE_ARG));
 }