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

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Date:	Fri, 08 Mar 2013 23:56:26 +0400
From:	Sergei Shtylyov <sergei.shtylyov@...entembedded.com>
To:	oskar.andero@...ymobile.com
CC:	linux-kernel@...r.kernel.org, linux-usb@...r.kernel.org,
	Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
	Felipe Balbi <balbi@...com>,
	Truls Bengtsson <truls.bengtsson@...ymobile.com>,
	Radovan Lekanovic <radovan.lekanovic@...ymobile.com>
Subject: Re: [RFC PATCH 1/1] usb: f_rndis: Avoid to use ERROR macro if cdev
 can be null

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.

WBR, Sergei

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