From 22e6b7b4a34ed8de58276d3582bc89077c5927b7 Mon Sep 17 00:00:00 2001
From: Manolo Gouy <Manolo>
Date: Thu, 17 Nov 2016 17:49:43 +0000
Subject: Fix crash when resizing double-buffered window smaller than
 transparent image (STR#3353).

git-svn-id: file:///fltk/svn/fltk/branches/branch-1.4@12117 ea41ed52-d2ee-0310-a9c1-e6b18d33e121
---
 src/Fl_Screen_Driver.cxx | 3 +++
 1 file changed, 3 insertions(+)

(limited to 'src')

diff --git a/src/Fl_Screen_Driver.cxx b/src/Fl_Screen_Driver.cxx
index e9fd4ec73..526f37b1e 100644
--- a/src/Fl_Screen_Driver.cxx
+++ b/src/Fl_Screen_Driver.cxx
@@ -158,6 +158,9 @@ uchar *Fl_Screen_Driver::read_image(uchar *p, int X, int Y, int w, int h, int al
   Fl_RGB_Image *img;
   if (fl_find(fl_window) == 0) { // read from off_screen buffer
     img = read_win_rectangle(p, X, Y, w, h, alpha);
+    if (!img) {
+      return NULL;
+    }
     img->alloc_array = 1;
   } else {
     img = traverse_to_gl_subwindows(Fl_Window::current(), p, X, Y, w, h, alpha, NULL);
-- 
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