From bbb7f4b875a0fc652e012cc07372fe8f3c4b4ff5 Mon Sep 17 00:00:00 2001
From: Alan Cox <alan@linux.intel.com>
Date: Mon, 2 Jul 2018 22:43:44 +0100
Subject: [PATCH] trs80: don't allow serial port terminals to do graphics !

---
 Kernel/platform-trs80/devgfx.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/Kernel/platform-trs80/devgfx.c b/Kernel/platform-trs80/devgfx.c
index e6a08ab6..dcf6dd73 100644
--- a/Kernel/platform-trs80/devgfx.c
+++ b/Kernel/platform-trs80/devgfx.c
@@ -101,7 +101,7 @@ int gfx_ioctl(uint8_t minor, uarg_t arg, char *ptr)
   uint8_t m;
   int err;
 
-  if (arg >> 8 != 0x03)
+  if (minor > 2 || (arg >> 8 != 0x03))
     return vt_ioctl(minor, arg, ptr);
 
   switch(arg) {
-- 
2.34.1