From f46eaf609e1f9344671a7886f161d460edc0fe0c Mon Sep 17 00:00:00 2001
From: Eli Zaretskii <eliz@gnu.org>
Date: Mon, 2 Mar 2026 17:03:17 +0200
Subject: [PATCH] ; * src/w32image.c (w32_gdip_export_frame): Add error
 checking.

---
 src/w32image.c | 6 +++++-
 1 file changed, 5 insertions(+), 1 deletion(-)

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);