linux-kernel - RE: [PATCH] usb/core: fix NULL pointer dereference in recursively_mark

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Date:	Fri, 3 Jan 2014 01:44:21 +0000
From:	"Du, ChangbinX" <changbinx.du@...el.com>
To:	Alan Stern <stern@...land.harvard.edu>
CC:	"gregkh@...uxfoundation.org" <gregkh@...uxfoundation.org>,
	"sarah.a.sharp@...ux.intel.com" <sarah.a.sharp@...ux.intel.com>,
	"Lan, Tianyu" <tianyu.lan@...el.com>,
	"burzalodowa@...il.com" <burzalodowa@...il.com>,
	"linux-usb@...r.kernel.org" <linux-usb@...r.kernel.org>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
Subject: RE: [PATCH] usb/core: fix NULL pointer dereference in
 recursively_mark_NOTATTACHED

> On Thu, 26 Dec 2013, Du, ChangbinX wrote:
> 
> > I can reproduce issue by adding a delay just after
> > usb_set_intfdata(intf, NULL)  (echo -1 > bConfigurationValue to trigger
> hub_dissconnect())without your patch.
> >
> > After patch applied, cannot reproduce and didn't found any other issue.
> Patch works well.
> >
> > Alan, need I update patch to v2 or you will do it?
> 
> Changbin, after looking more closely I realized there was a second aspect to
> this race: recursively_mark_NOTATTACHED uses hub->ports[i] while
> hub_disconnect removes the port devices.  You ought to be able to cause
> an oops by inserting a delay just after the loop where
> usb_hub_remove_port_device is called.
> 
> The updated patch below should fix both problems.  Can you test it?
> 
> Alan Stern
> 

Ok, I'll test it today or tomorrow. Please wait my response.
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