From da408fce98153e0fab3d82fe28813085feed0974 Mon Sep 17 00:00:00 2001
From: Behdad Esfahbod <behdad@behdad.org>
Date: Sat, 3 Nov 2018 15:49:37 -0400
Subject: [PATCH] [blob] Allow null parent in create_sub_blob()

Like font and unicode.
---
 src/hb-blob.cc | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/src/hb-blob.cc b/src/hb-blob.cc
index 4b036e804..9271200b1 100644
--- a/src/hb-blob.cc
+++ b/src/hb-blob.cc
@@ -149,7 +149,7 @@ hb_blob_create_sub_blob (hb_blob_t    *parent,
 {
   hb_blob_t *blob;
 
-  if (!length || offset >= parent->length)
+  if (!length || !parent || offset >= parent->length)
     return hb_blob_get_empty ();
 
   hb_blob_make_immutable (parent);