From e1ac38f8dd04c29d2d4140f5a492cdaf25d72901 Mon Sep 17 00:00:00 2001
From: Behdad Esfahbod <behdad@behdad.org>
Date: Tue, 5 Jun 2012 20:31:49 -0400
Subject: [PATCH] Fix inert buffer set_length() with zero

Oops!
---
 src/hb-buffer.cc | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/src/hb-buffer.cc b/src/hb-buffer.cc
index 20de022c6..c27cc1561 100644
--- a/src/hb-buffer.cc
+++ b/src/hb-buffer.cc
@@ -694,6 +694,9 @@ hb_bool_t
 hb_buffer_set_length (hb_buffer_t  *buffer,
 		      unsigned int  length)
 {
+  if (unlikely (hb_object_is_inert (buffer)))
+    return length == 0;
+
   if (!buffer->ensure (length))
     return FALSE;