From 8a5ee3faf940a32075a9820bac6950bd93881ef4 Mon Sep 17 00:00:00 2001
From: Jay Petacat <jay@jayschwa.net>
Date: Sun, 12 Apr 2020 00:55:52 -0400
Subject: [PATCH] video: NULL out pointer to freed window surface

This behavior matches SDL_RecreateWindow and makes it less likely that
another piece of code (e.g. a DestroyWindowFramebuffer implementation)
will attempt to use or free the stale surface pointer.
---
 src/video/SDL_video.c | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/src/video/SDL_video.c b/src/video/SDL_video.c
index b6d083a53..d8778aa4d 100644
--- a/src/video/SDL_video.c
+++ b/src/video/SDL_video.c
@@ -2796,6 +2796,8 @@ SDL_DestroyWindow(SDL_Window * window)
     if (window->surface) {
         window->surface->flags &= ~SDL_DONTFREE;
         SDL_FreeSurface(window->surface);
+        window->surface = NULL;
+        window->surface_valid = SDL_FALSE;
     }
     if (_this->DestroyWindowFramebuffer) {
         _this->DestroyWindowFramebuffer(_this, window);