From 0cdb44f01f0e7cc5405b1358149e7719db77bf03 Mon Sep 17 00:00:00 2001
From: Friedemann Kleint <Friedemann.Kleint@qt.io>
Date: Fri, 25 Mar 2022 18:03:19 +0100
Subject: [PATCH] Windows: Fix potential crash when retrieving default printer

GetDefaultPrinter() has been observed to return size == 0.

Pick-to: 6.3 6.2 5.15
Fixes: QTBUG-53290
Change-Id: Id4c7a06d14d368c792e15e55cacf2366b6aedc7b
Reviewed-by: Andy Shaw <andy.shaw@qt.io>
---
 src/printsupport/platform/windows/qwindowsprintdevice.cpp | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/src/printsupport/platform/windows/qwindowsprintdevice.cpp b/src/printsupport/platform/windows/qwindowsprintdevice.cpp
index a6aa9c6504a..faf491d9a90 100644
--- a/src/printsupport/platform/windows/qwindowsprintdevice.cpp
+++ b/src/printsupport/platform/windows/qwindowsprintdevice.cpp
@@ -499,7 +499,7 @@ QStringList QWindowsPrintDevice::availablePrintDeviceIds()
 QString QWindowsPrintDevice::defaultPrintDeviceId()
 {
     DWORD size = 0;
-    if (GetDefaultPrinter(nullptr, &size) == ERROR_FILE_NOT_FOUND)
+    if (GetDefaultPrinter(nullptr, &size) == ERROR_FILE_NOT_FOUND || size < 2)
        return QString();
 
     QScopedArrayPointer<wchar_t> name(new wchar_t[size]);