linux-kernel - Re: [RFC PATCH 1/1] usb: f_rndis: Avoid to use ERROR macro if cdev can be null

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Message-ID: <20130318082807.GA22001@caracas.corpusers.net>
Date:	Mon, 18 Mar 2013 09:28:07 +0100
From:	<oskar.andero@...ymobile.com>
To:	Greg Kroah-Hartman <gregkh@...uxfoundation.org>
CC:	Sergei Shtylyov <sergei.shtylyov@...entembedded.com>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	"linux-usb@...r.kernel.org" <linux-usb@...r.kernel.org>,
	Felipe Balbi <balbi@...com>,
	"Bengtsson, Truls" <Truls.Bengtsson@...ymobile.com>,
	"Lekanovic, Radovan" <Radovan.Lekanovic@...ymobile.com>
Subject: Re: [RFC PATCH 1/1] usb: f_rndis: Avoid to use ERROR macro if cdev
 can be null

On 21:16 Fri 08 Mar     , Greg Kroah-Hartman wrote:
> On Fri, Mar 08, 2013 at 11:56:26PM +0400, Sergei Shtylyov wrote:
> > Hello.
> > 
> > On 08-03-2013 16:53, oskar.andero@...ymobile.com wrote:
> > 
> > >From: Truls Bengtsson <truls.bengtsson@...ymobile.com>
> > 
> > >The udc_irq service runs the isr_tr_complete_handler which in turn
> > >"nukes" the endpoints, including a call to rndis_response_complete,
> > >if appropriate. If the rndis_msg_parser fails here, an error will
> > >be printed using a dev_err call (through the ERROR() macro).
> > 
> > >However, if the usb cable was just disconnected the device (cdev)
> > >might not be available and will be null. Since the dev_err macro will
> > >dereference the cdev pointer we get a null pointer exception.
> > 
> > >Reviewed-by: Radovan Lekanovic <radovan.lekanovic@...ymobile.com>
> > >Signed-off-by: Truls Bengtsson <truls.bengtsson@...ymobile.com>
> > >Signed-off-by: Oskar Andero <oskar.andero@...ymobile.com>
> > >---
> > >  drivers/usb/gadget/f_rndis.c |    4 ++--
> > >  1 files changed, 2 insertions(+), 2 deletions(-)
> > 
> > >diff --git a/drivers/usb/gadget/f_rndis.c b/drivers/usb/gadget/f_rndis.c
> > >index 71beeb8..41b5ebd 100644
> > >--- a/drivers/usb/gadget/f_rndis.c
> > >+++ b/drivers/usb/gadget/f_rndis.c
> > >@@ -6,6 +6,7 @@
> > >   * Copyright (C) 2008 Nokia Corporation
> > >   * Copyright (C) 2009 Samsung Electronics
> > >   *                    Author: Michal Nazarewicz (mina86@...a86.com)
> > >+ * Copyright (C) 2013 Sony Mobile Communications AB.
> > 
> >    Your change seems too insignificant to add a copyright.
> 
> You are right, it legally is.  Truls, please consult your company's
> lawyers if you have questions about this, you can not assert copyright
> over a file for a 2 line change, that's not allowed at all in any
> jurisdiction I know of.
> 
> Because of that, I can not accept this change, sorry.

Thanks for your input guys and I totally agree with you! However, I was
expecting more comments on the cover-letter, or should I take it that this
solution is acceptable?

-Oskar
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