From 9f6ed10545b1009cce86289f793165dd7e4b7c9e Mon Sep 17 00:00:00 2001
From: Werner Lemberg <wl@gnu.org>
Date: Mon, 22 Apr 2019 08:10:56 +0200
Subject: [PATCH] * src/base/ftbitmap.c (FT_Bitmap_Blend): Check target pitch.

Problem reported by Sender Ghost <lightside@gmx.com>.
---
 ChangeLog           | 6 ++++++
 src/base/ftbitmap.c | 7 +++++++
 2 files changed, 13 insertions(+)

diff --git a/ChangeLog b/ChangeLog
index 290c8650f..78b82c93b 100644
--- a/ChangeLog
+++ b/ChangeLog
@@ -1,3 +1,9 @@
+2019-04-22  Werner Lemberg  <wl@gnu.org>
+
+	* src/base/ftbitmap.c (FT_Bitmap_Blend): Check target pitch.
+
+	Problem reported by Sender Ghost <lightside@gmx.com>.
+
 2019-04-22  Werner Lemberg  <wl@gnu.org>
 
 	Fix return value of `FT_Set_Named_Instance' (#56186).
diff --git a/src/base/ftbitmap.c b/src/base/ftbitmap.c
index 1bdcd9eff..7e5e92d1d 100644
--- a/src/base/ftbitmap.c
+++ b/src/base/ftbitmap.c
@@ -971,6 +971,13 @@
 
 
       pitch = target->pitch;
+      if ( !pitch )
+      {
+        FT_TRACE5(( "FT_Blend_Bitmap:"
+                    " zero target bitmap pitch is invalid\n" ));
+        return FT_THROW( Invalid_Argument );
+      }
+
       if ( pitch < 0 )
         pitch = -pitch;