netdev - Re: Re: [PATCH net v4] nfc: ... device_is

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Message-ID: <2060fc1.5388.1807352ac69.Coremail.linma@zju.edu.cn>
Date:   Fri, 29 Apr 2022 11:17:19 +0800 (GMT+08:00)
From:   "Lin Ma" <linma@....edu.cn>
To:     "Greg KH" <gregkh@...uxfoundation.org>
Cc:     "Duoming Zhou" <duoming@....edu.cn>,
        krzysztof.kozlowski@...aro.org, pabeni@...hat.com,
        linux-kernel@...r.kernel.org, davem@...emloft.net,
        alexander.deucher@....com, akpm@...ux-foundation.org,
        broonie@...nel.org, netdev@...r.kernel.org,
        "Jakub Kicinski" <kuba@...nel.org>
Subject: Re: Re: [PATCH net v4] nfc: ... device_is_registered() is data
 race-able

Hello there,

> 
> That is what proper reference counting is supposed to be for.  Perhaps
> you are running into a driver subsystem that is not doing that well, or
> at all?
> 
> Try adding the needed references and the use-after-free should almost be
> impossible to happen.
> 

That's true, if all the relevant resources are managed properly by the reference
count, everything will be easier.

> thanks,
> 
> greg k-h

Thanks
Lin Ma