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Date: Thu, 20 Jul 1995 08:20:02 -0700
Message-Id: <199507201520.IAA11256@freefall.cdrom.com>
From: vak@cronyx.ru
Reply-To: vak@cronyx.ru
To: freebsd-bugs
Subject: kern/627: vidcontrol causes crash when booted with sc0 disabled
In-Reply-To: Your message of Thu, 20 Jul 1995 19:12:13 +0400
	<199507201512.TAA00322@hanoi.net.kiae.su>
Sender: bugs-owner@FreeBSD.org
Precedence: bulk


>Number:         627
>Category:       kern
>Synopsis:       vidcontrol causes crash when booted with sc0 disabled
>Confidential:   no
>Severity:       serious
>Priority:       medium
>Responsible:    freebsd-bugs (FreeBSD bugs mailing list)
>State:          open
>Class:          sw-bug
>Submitter-Id:   current-users
>Arrival-Date:   Thu Jul 20 08:20:01 1995
>Originator:     Serge V.Vakulenko
>Organization:
Cronyx Ltd.
>Release:        FreeBSD 2.0-BUILT-19950603 i386
>Environment:
>Description:

When the system is loaded with the sc0 driver configured, but disabled
(in kernel config mode), then any vidcontrol call causes the system crash.

>How-To-Repeat:

1. Boot the kernel with -h -c options.
2. Disable the sc0 driver (disable sc0). Quit the config mode (quit).
3. After the system is loaded, try, say, "vidcontrol -c blink".
   The system will crash.

>Fix:
	
Apply the following patch:

--- syscons205.c	Tue May 30 12:03:13 1995
+++ syscons.c	Thu Jul 20 17:16:29 1995
@@ -303,7 +303,7 @@
 {
     int unit = minor(dev);
 
-    if (unit > MAXCONS || unit < 0)
+    if (! init_done || unit > MAXCONS || unit < 0)
 	return(NULL);
     if (unit == MAXCONS)
 	return CONSOLE_TTY;
>Audit-Trail:
>Unformatted: