From 5dfd6e07626a9022a995eb7fa16767eff66c6047 Mon Sep 17 00:00:00 2001
From: Behdad Esfahbod <behdad@behdad.org>
Date: Mon, 10 Sep 2018 15:45:32 +0200
Subject: [PATCH] Fix sanitize or Context Rule

Fixes https://github.com/harfbuzz/harfbuzz/issues/1110
---
 src/hb-ot-layout-gsubgpos.hh | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/src/hb-ot-layout-gsubgpos.hh b/src/hb-ot-layout-gsubgpos.hh
index 315951a34..bd4611d22 100644
--- a/src/hb-ot-layout-gsubgpos.hh
+++ b/src/hb-ot-layout-gsubgpos.hh
@@ -1267,7 +1267,7 @@ struct Rule
     return_trace (inputCount.sanitize (c) &&
 		  lookupCount.sanitize (c) &&
 		  c->check_range (inputZ,
-				  inputZ[0].static_size * inputCount +
+				  inputZ[0].static_size * (inputCount ? inputCount - 1 : 0) +
 				  LookupRecord::static_size * lookupCount));
   }