* src/base/ftbitmap.c (FT_Bitmap_Blend): Check target pitch.

Problem reported by Sender Ghost <lightside@gmx.com>.

2 files changed, 13 insertions, 0 deletions

diff --git a/ChangeLog b/ChangeLog
index 290c8650f..78b82c93b 100644
--- a/ChangeLog
+++ b/ChangeLog
@@ -1,5 +1,11 @@
 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).
 
 	* src/truetype/ttgxvar.c (TT_Set_Named_Instance): Correctly handle
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;