RE: [PATCH] usb/core: fix NULL pointer dereference inrecursively_mark_NOTATTACHED

From: Du, ChangbinX
Date: Thu Jan 02 2014 - 20:44:34 EST

> 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.
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majordomo@xxxxxxxxxxxxxxx
More majordomo info at
Please read the FAQ at