From: Jiri Slaby <jslaby@suse.cz>
Date: Tue, 3 May 2016 15:05:54 +0000 (+0200)
Subject: tty: vt, return error when con_startup fails
X-Git-Tag: v4.5.6~25
X-Git-Url: http://git.ipfire.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=c0a561b4eaa9a24f5ffcef658b82defe8f84f068;p=thirdparty%2Fkernel%2Fstable.git

tty: vt, return error when con_startup fails

commit 6798df4c5fe0a7e6d2065cf79649a794e5ba7114 upstream.

When csw->con_startup() fails in do_register_con_driver, we return no
error (i.e. 0). This was changed back in 2006 by commit 3e795de763.
Before that we used to return -ENODEV.

So fix the return value to be -ENODEV in that case again.

Fixes: 3e795de763 ("VT binding: Add binding/unbinding support for the VT console")
Signed-off-by: Jiri Slaby <jslaby@suse.cz>
Reported-by: "Dan Carpenter" <dan.carpenter@oracle.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
---

diff --git a/drivers/tty/vt/vt.c b/drivers/tty/vt/vt.c
index bd51bdd0a7bf2..2b5382ea4842b 100644
--- a/drivers/tty/vt/vt.c
+++ b/drivers/tty/vt/vt.c
@@ -3583,9 +3583,10 @@ static int do_register_con_driver(const struct consw *csw, int first, int last)
 		goto err;
 
 	desc = csw->con_startup();
-
-	if (!desc)
+	if (!desc) {
+		retval = -ENODEV;
 		goto err;
+	}
 
 	retval = -EINVAL;