linux-kernel - Re: [linux-usb-devel] 2.6.20-rc4: null pointer deref in khubd

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Message-Id: <200701102054.57303.oliver@neukum.org>
Date:	Wed, 10 Jan 2007 20:54:56 +0100
From:	Oliver Neukum <oliver@...kum.org>
To:	Alan Stern <stern@...land.harvard.edu>
Cc:	linux-usb-devel@...ts.sourceforge.net,
	Andrew Morton <akpm@...l.org>, Greg KH <greg@...ah.com>,
	Pavel Machek <pavel@....cz>,
	kernel list <linux-kernel@...r.kernel.org>
Subject: Re: [linux-usb-devel] 2.6.20-rc4: null pointer deref in khubd

Am Mittwoch, 10. Januar 2007 18:31 schrieb Alan Stern:
> > Regarding the bug this device uncovers, it seems to me that this in drivers/base/core.c
> >       if (parent)
> >               klist_add_tail(&dev->knode_parent, &parent->klist_children);
> > should make knode_parent a valid node under all circumstances.
> > Hm.
> 
> I haven't seen the original bug report.  Where does the NULL pointer deref 
> occur?

Apparently here: drivers/base/core.c:

void device_del(struct device * dev)
{
	struct device * parent = dev->parent;
	struct class_interface *class_intf;

	if (parent)
		klist_del(&dev->knode_parent);

The obvious change with this device is that usb_set_configuration() is never
called, but that should not matter.

	Regards
		Oliver
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