; * src/w32image.c (w32_gdip_export_frame): Add error checking.

1 files changed, 5 insertions, 1 deletions

diff --git a/src/w32image.c b/src/w32image.c
index 36d259a07c2..f0838fd0aba 100644
--- a/src/w32image.c
+++ b/src/w32image.c
@@ -580,9 +580,13 @@ w32_gdip_export_frame (HWND hwnd, Lisp_Object file, CLSID *clsid)
      made visible, in which case users might want them in the image.
      The downside is that the image has some of the desktop around the
      frame included in it.  So what?  */
-  GetWindowRect (hwnd, &frame_rect);
+  if (!GetWindowRect (hwnd, &frame_rect))
+    return -1;
   frame_width = frame_rect.right - frame_rect.left;
   frame_height = frame_rect.bottom - frame_rect.top;
+  if (!(frame_width > 0 && frame_height > 0))
+    return -1;
+
   hdc = GetWindowDC (hwnd);
   bits_per_pixel = GetDeviceCaps (hdc, BITSPIXEL);
   capture_hdc = CreateCompatibleDC (hdc);