linux-kernel - [PATCH 3/6] UML - Fix device unplug crash

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Date:	Tue, 27 Mar 2007 14:27:48 -0400
From:	Jeff Dike <jdike@...toit.com>
To:	Andrew Morton <akpm@...l.org>
Cc:	LKML <linux-kernel@...r.kernel.org>,
	uml-devel <user-mode-linux-devel@...ts.sourceforge.net>
Subject: [PATCH 3/6] UML - Fix device unplug crash

Fix a NULL dereference when unplugging a device.  The default value of
err_msg wants to be "" in case the driver doesn't modify it.

Signed-off-by: Jeff Dike <jdike@...ux.intel.com>
--
 arch/um/drivers/mconsole_kern.c |    3 +++
 1 file changed, 3 insertions(+)

Index: linux-2.6.21-mm/arch/um/drivers/mconsole_kern.c
===================================================================
--- linux-2.6.21-mm.orig/arch/um/drivers/mconsole_kern.c	2007-03-27 11:35:47.000000000 -0400
+++ linux-2.6.21-mm/arch/um/drivers/mconsole_kern.c	2007-03-27 11:46:28.000000000 -0400
@@ -614,6 +614,9 @@ void mconsole_remove(struct mc_request *
 	err_msg = NULL;
 	err = (*dev->remove)(n, &err_msg);
 	switch(err){
+	case 0:
+		err_msg = "";
+		break;
 	case -ENODEV:
 		if(err_msg == NULL)
 			err_msg = "Device doesn't exist";
-
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