linux-kernel - [PATCH] base/class.c: prevent ooops due to insert/remove race

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Message-ID: <474E3964.7040200@rtr.ca>
Date:	Wed, 28 Nov 2007 23:00:36 -0500
From:	Mark Lord <lkml@....ca>
To:	Linux Kernel <linux-kernel@...r.kernel.org>,
	Greg KH <gregkh@...e.de>,
	Andrew Morton <akpm@...ux-foundation.org>
Subject: [PATCH] base/class.c: prevent ooops due to insert/remove race

While doing insert/remove (quickly) tests on USB, I managed to trigger
an Oops on 2.6.23.1 on the call to strlen() in make_class_name().

This patch prevents this oops.

There is still the larger problem of the overall race
that caused this in the first place, but much of the rest
of the code in class.c appears to also do NULL checks to
avoid Oops'ing, so this continues the tradition.

Signed-off-by:  Mark Lord <mlord@...ox.com>
---

Patch applies to both 2.6.24 and 2.6.23.

--- old/drivers/base/class.c	2007-11-28 22:54:59.000000000 -0500
+++ linux/drivers/base/class.c	2007-11-28 22:54:48.000000000 -0500
@@ -354,6 +354,8 @@
 	char *class_name;
 	int size;

+	if (!name)
+		return NULL;
 	size = strlen(name) + strlen(kobject_name(kobj)) + 2;

 	class_name = kmalloc(size, GFP_KERNEL);
-
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