From aa80c7c8b4242d61e771b28775638bf2a2c5100f Mon Sep 17 00:00:00 2001
From: Behdad Esfahbod <behdad@behdad.org>
Date: Thu, 18 Feb 2021 09:31:46 -0700
Subject: [PATCH] [aat] Add buffer->successful check before
 buffer->next_glyph()

---
 src/hb-aat-layout-common.hh | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/src/hb-aat-layout-common.hh b/src/hb-aat-layout-common.hh
index 75d523f5f..0f5815c22 100644
--- a/src/hb-aat-layout-common.hh
+++ b/src/hb-aat-layout-common.hh
@@ -778,7 +778,7 @@ struct StateTableDriver
       state = machine.new_state (entry.newState);
       DEBUG_MSG (APPLY, nullptr, "s%d", state);
 
-      if (buffer->idx == buffer->len)
+      if (buffer->idx == buffer->len || unlikely (!buffer->successful))
 	break;
 
       if (!(entry.flags & context_t::DontAdvance) || buffer->max_ops-- <= 0)