From ae8982fe3e71acefb12fe248b4ffd4137b29e8b9 Mon Sep 17 00:00:00 2001
From: Ray Chason <Ray Chason>
Date: Thu, 2 Jul 2026 21:34:35 -0400
Subject: [PATCH] MS-DOS: Check font pointer for null

The 16 color mode loads the font specified in font_map, and accepts it
only if its size is 8 by 16 pixels. This change avoids a null
dereference if the font is not found.
---
 sys/msdos/vidvga.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/sys/msdos/vidvga.c b/sys/msdos/vidvga.c
index c69823d74..fb5de8db7 100644
--- a/sys/msdos/vidvga.c
+++ b/sys/msdos/vidvga.c
@@ -811,7 +811,7 @@ vga_Init(void)
     }
     free_font(psf_font);
     psf_font = load_font(font_name);
-    if (psf_font->width != 8 || psf_font->height != 16) {
+    if (psf_font != NULL && psf_font->width != 8 || psf_font->height != 16) {
         raw_printf("VGA mode only supports 8x16 fonts");
         free_font(psf_font);
         psf_font = NULL;