linux-kernel - Re: [PATCH] USB: gadget: udc: atmel: fix possible oops when unloading module

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Message-ID: <20141226152707.GG17430@saruman>
Date:	Fri, 26 Dec 2014 09:27:07 -0600
From:	Felipe Balbi <balbi@...com>
To:	"Wu, Songjun" <songjun.wu@...el.com>
CC:	<balbi@...com>, <gregkh@...uxfoundation.org>,
	<linux-usb@...r.kernel.org>, <linux-kernel@...r.kernel.org>,
	<nicolas.ferre@...el.com>, <linux-arm-kernel@...ts.infradead.org>
Subject: Re: [PATCH] USB: gadget: udc: atmel: fix possible oops when
 unloading module

Hi,

On Wed, Dec 24, 2014 at 09:14:53AM +0800, Wu, Songjun wrote:
> 
> 在 12/24/2014 00:24, Felipe Balbi 写道:
> >On Mon, Dec 22, 2014 at 05:26:14PM +0800, Songjun Wu wrote:
> >>When unloading the module, the urb request will be dequeued
> >>and the completion routine will be excuted.
> >>If no urb packet, the urb request will not be added to the endpoint queue
> >>and the completion routine pointer in urb request is NULL.
> >>Accessing to the NULL function pointer will cause the oops issue.
> >>Add the code to check the urb request is in the endpoint queue or not.
> >>If the urb request is not in the endpoint queue, a negative error code
> >>will be returned.
> >
> >have you triggered the NULL pointer oops ? Care to add it to the commit
> >log.
> 
> Executing the 'insmod g_hid.ko', then executing the 'rmmod g_hid.ko', the
> NULL pointer oops will be triggered.

what about all my other queries below and what about adding the oops
dump to commit log ?

> >Also, which commit is this fixing ? Does this need to be backported ?
> >When was the bug introduced ?

-- 
balbi

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