linux-kernel - RE: [PATCH] drivers: usb: gadget: udc: Fix NULL dereference

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Message-ID: <BN3PR0301MB0849AD8FBBB71F287C72B9D581180@BN3PR0301MB0849.namprd03.prod.outlook.com>
Date:	Tue, 10 Mar 2015 02:02:44 +0000
From:	Peter Chen <Peter.Chen@...escale.com>
To:	"balbi@...com" <balbi@...com>
CC:	Tapasweni Pathak <tapaswenipathak@...il.com>,
	"gregkh@...uxfoundation.org" <gregkh@...uxfoundation.org>,
	"jg1.han@...sung.com" <jg1.han@...sung.com>,
	"benoit.taine@...6.fr" <benoit.taine@...6.fr>,
	"linux-usb@...r.kernel.org" <linux-usb@...r.kernel.org>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	"julia.lawall@...6.fr" <julia.lawall@...6.fr>
Subject: RE: [PATCH] drivers: usb: gadget: udc: Fix NULL dereference

 
> > --- a/drivers/usb/gadget/udc/lpc32xx_udc.c
> > +++ b/drivers/usb/gadget/udc/lpc32xx_udc.c
> > @@ -1803,7 +1803,7 @@ static int lpc32xx_ep_queue(struct usb_ep *_ep,
> >  	req = container_of(_req, struct lpc32xx_request, req);
> >  	ep = container_of(_ep, struct lpc32xx_ep, ep);
> >
> > -	if (!_req || !_req->complete || !_req->buf ||
> > +	if (!_ep || !_req || !_req->complete || !_req->buf ||
> >  	    !list_empty(&req->queue))
> >  		return -EINVAL;
> >
> > @@ -1815,8 +1815,7 @@ static int lpc32xx_ep_queue(struct usb_ep *_ep,
> >  	}
> >
> >
> > -	if ((!udc) || (!udc->driver) ||
> > -	    (udc->gadget.speed == USB_SPEED_UNKNOWN)) {
> > +	if ((!udc->driver) || (udc->gadget.speed == USB_SPEED_UNKNOWN))
> {
> >  		dev_dbg(udc->dev, "invalid device\n");
> >  		return -EINVAL;
> >  	}
> 
> what's going to happen here ?
> 

I just changed the current code, in fact, udc->driver is impossible to NULL which
is cleared at .udc_stop. 

The speed is possible for unknown if the reset has occurred at that time.

Peter
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