[HB] Add note about auditing sanitize code for overflows

src/TODO

diff --git a/src/TODO b/src/TODO
index d2b067d..54560aa 100644
--- a/src/TODO
+++ b/src/TODO
@@ -3,3 +3,4 @@
 - cmap14 support in get_glyph callback
 - size_t?
 - Figure out compiler selection (add test for link to libstdc++)
+- Audit sanitize for int overflows

src/hb-ot-layout-gpos-private.hh

diff --git a/src/hb-ot-layout-gpos-private.hh b/src/hb-ot-layout-gpos-private.hh
index e357b01..6b20716 100644
--- a/src/hb-ot-layout-gpos-private.hh
+++ b/src/hb-ot-layout-gpos-private.hh
@@ -565,7 +565,7 @@
 	   SANITIZE_THIS2 (classDef1, classDef2) &&
 	   SANITIZE_MEM (values,
 			 (valueFormat1.get_size () + valueFormat2.get_size ()) *
-			 class1Count * class2Count);
+			 class1Count * class2Count); /* XXX overflow (in other places too) */
   }
 
   private: