linux-kernel - [36/89] SCSI: enclosure: fix oops while iterating enclosure

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Message-Id: <20100330225830.572370316@linux.site>
Date:	Tue, 30 Mar 2010 15:57:38 -0700
From:	Greg KH <gregkh@...e.de>
To:	linux-kernel@...r.kernel.org, stable@...nel.org
Cc:	stable-review@...nel.org, torvalds@...ux-foundation.org,
	akpm@...ux-foundation.org, alan@...rguk.ukuu.org.uk,
	James Bottomley <James.Bottomley@...e.de>,
	Greg Kroah-Hartman <gregkh@...e.de>
Subject: [36/89] SCSI: enclosure: fix oops while iterating enclosure_status array

2.6.31-stable review patch.  If anyone has any objections, please let us know.

------------------

From: James Bottomley <James.Bottomley@...e.de>

commit cc9b2e9f6603190c009e5d2629ce8e3f99571346 upstream.

Based on patch originally by Jeff Mahoney <jeffm@...e.com>

 enclosure_status is expected to be a NULL terminated array of strings
 but isn't actually NULL terminated. When writing an invalid value to
 /sys/class/enclosure/.../.../status, it goes off the end of the array
 and Oopses.


Fix by making the assumption true and adding NULL at the end.

Reported-by: Artur Wojcik <artur.wojcik@...el.com>
Signed-off-by: James Bottomley <James.Bottomley@...e.de>
Signed-off-by: Greg Kroah-Hartman <gregkh@...e.de>

---
 drivers/misc/enclosure.c  |    1 +
 include/linux/enclosure.h |    2 ++
 2 files changed, 3 insertions(+)

--- a/drivers/misc/enclosure.c
+++ b/drivers/misc/enclosure.c
@@ -362,6 +362,7 @@ static const char *const enclosure_statu
 	[ENCLOSURE_STATUS_NOT_INSTALLED] = "not installed",
 	[ENCLOSURE_STATUS_UNKNOWN] = "unknown",
 	[ENCLOSURE_STATUS_UNAVAILABLE] = "unavailable",
+	[ENCLOSURE_STATUS_MAX] = NULL,
 };
 
 static const char *const enclosure_type [] = {
--- a/include/linux/enclosure.h
+++ b/include/linux/enclosure.h
@@ -42,6 +42,8 @@ enum enclosure_status {
 	ENCLOSURE_STATUS_NOT_INSTALLED,
 	ENCLOSURE_STATUS_UNKNOWN,
 	ENCLOSURE_STATUS_UNAVAILABLE,
+	/* last element for counting purposes */
+	ENCLOSURE_STATUS_MAX
 };
 
 /* SFF-8485 activity light settings */


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