From 93ebd6307efeb95a29bc614edd0c67c2af850e98 Mon Sep 17 00:00:00 2001
From: Toomas Soome <tsoome@FreeBSD.org>
Date: Sun, 24 Jan 2021 20:59:36 +0200
Subject: [PATCH] vt: panic while changing vt font

Set refcount for loader provided font to 1 to prevent this font
from being released (so we can reset to default).

PR: 252833
---
 sys/dev/vt/vt_core.c | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/sys/dev/vt/vt_core.c b/sys/dev/vt/vt_core.c
index 2352ed82342..ac89d8635e7 100644
--- a/sys/dev/vt/vt_core.c
+++ b/sys/dev/vt/vt_core.c
@@ -1528,6 +1528,8 @@ parse_font_info(struct font_info *fi)
 	ptr = roundup2(ptr, 8);
 
 	vfp = &vt_font_loader;
+	/* This is default font, set refcount 1 to disable removal. */
+	vfp->vf_refcount = 1;
 	vfp->vf_height = fi->fi_height;
 	vfp->vf_width = fi->fi_width;
 	for (unsigned i = 0; i < VFNT_MAPS; i++) {