LibGfx: Don't allow creating bitmaps whose sizes would overflow

If the area or size_in_bytes calculation for a Gfx::Bitmap would
overflow, we now refuse to create such a bitmap and return nullptr.

Thanks to @itamar8910 for finding this! :^)

1 files changed, 2 insertions, 2 deletions

diff --git a/Libraries/LibGUI/Window.h b/Libraries/LibGUI/Window.h
index f8fe54652d..59d20a1bcd 100644
--- a/Libraries/LibGUI/Window.h
+++ b/Libraries/LibGUI/Window.h
@@ -189,8 +189,8 @@ protected:
 private:
     virtual bool is_window() const override final { return true; }
 
-    NonnullRefPtr<Gfx::Bitmap> create_backing_bitmap(const Gfx::Size&);
-    NonnullRefPtr<Gfx::Bitmap> create_shared_bitmap(Gfx::BitmapFormat, const Gfx::Size&);
+    RefPtr<Gfx::Bitmap> create_backing_bitmap(const Gfx::Size&);
+    RefPtr<Gfx::Bitmap> create_shared_bitmap(Gfx::BitmapFormat, const Gfx::Size&);
     void set_current_backing_bitmap(Gfx::Bitmap&, bool flush_immediately = false);
     void flip(const Vector<Gfx::Rect, 32>& dirty_rects);
     void force_update();