linux-kernel - Re: [PATCH v3] usbip: vudc: Fix use after free bug in vudc

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Date:   Fri, 17 Mar 2023 02:02:27 +0800
From:   Zheng Hacker <hackerzheng666@...il.com>
To:     Shuah Khan <skhan@...uxfoundation.org>
Cc:     Zheng Wang <zyytlz.wz@....com>, valentina.manea.m@...il.com,
        shuah@...nel.org, gregkh@...uxfoundation.org,
        linux-usb@...r.kernel.org, linux-kernel@...r.kernel.org,
        1395428693sheep@...il.com, alex000young@...il.com
Subject: Re: [PATCH v3] usbip: vudc: Fix use after free bug in vudc_remove due
 to race condition

Shuah Khan <skhan@...uxfoundation.org> 于2023年3月17日周五 01:57写道：
>
> On 3/16/23 11:44, Zheng Wang wrote:
> > In vudc_probe, it calls init_vudc_hw, which bound &udc->timer with v_timer.
> >
> > When it calls usbip_sockfd_store, it will call v_start_timer to start the
> > timer work.
> >
> > When we call vudc_remove to remove the driver, theremay be a sequence as
> > follows:
> >
>
> When you resend the patch as you indicated would, please add details
> on how you found this proble,m.
>

Get it, I found it by static analysis. So this might be false postive.

Best regards,
Zheng

> > Fix it by shutdown the timer work before cleanup in vudc_remove.
> >
>
> thanks,
> -- Shuah
>