From 490f8979a260c16b1df055eab386345da18a2d54 Mon Sep 17 00:00:00 2001
From: Matthias Clasen <mclasen@redhat.com>
Date: Wed, 10 Jul 2019 20:26:23 -0400
Subject: [PATCH] bidi: Be safer against bad input

Index: pango/pango-bidi-type.c
--- pango/pango-bidi-type.c.orig
+++ pango/pango-bidi-type.c
@@ -179,8 +179,11 @@ pango_log2vis_get_embedding_levels (const gchar    *te
   for (i = 0, p = text; p < text + length; p = g_utf8_next_char(p), i++)
     {
       gunichar ch = g_utf8_get_char (p);
-      FriBidiCharType char_type;
-      char_type = fribidi_get_bidi_type (ch);
+      FriBidiCharType char_type = fribidi_get_bidi_type (ch);
+
+      if (i == n_chars)
+        break;
+
       bidi_types[i] = char_type;
       ored_types |= char_type;
       if (FRIBIDI_IS_STRONG (char_type))