linux-kernel - Re: [PATCH v5] wifi: brcmfmac: Fix use-after-free bug in brcmf_cfg80211

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Date:   Mon, 13 Nov 2023 14:11:51 +0200
From:   Kalle Valo <kvalo@...nel.org>
To:     Arend van Spriel <arend.vanspriel@...adcom.com>
Cc:     Zheng Hacker <hackerzheng666@...il.com>,
        Zheng Wang <zyytlz.wz@....com>, aspriel@...il.com,
        franky.lin@...adcom.com, hante.meuleman@...adcom.com,
        johannes.berg@...el.com, marcan@...can.st,
        linus.walleij@...aro.org, jisoo.jang@...sei.ac.kr,
        linuxlovemin@...sei.ac.kr, wataru.gohda@...ress.com,
        linux-wireless@...r.kernel.org,
        brcm80211-dev-list.pdl@...adcom.com,
        SHA-cyfmac-dev-list@...ineon.com, linux-kernel@...r.kernel.org,
        security@...nel.org, stable@...r.kernel.org
Subject: Re: [PATCH v5] wifi: brcmfmac: Fix use-after-free bug in
 brcmf_cfg80211_detach

Arend van Spriel <arend.vanspriel@...adcom.com> writes:

> On November 8, 2023 4:03:26 AM Zheng Hacker <hackerzheng666@...il.com>
> wrote:
>
>> Arend Van Spriel <arend.vanspriel@...adcom.com> 于2023年11月6日周一 23:48写道：
>>>
>>> On November 6, 2023 3:44:53 PM Zheng Hacker <hackerzheng666@...il.com> wrote:
>>>
>>>> Thanks! I didn't test it for I don't have a device. Very appreciated
>>>> if anyone could help with that.
>>>
>>> I would volunteer, but it made me dig deep and not sure if there is a
>>> problem to solve here.
>>>
>>> brcmf_cfg80211_detach() calls wl_deinit_priv() -> brcmf_abort_scanning() ->
>>> brcmf_notify_escan_complete() which does delete the timer.
>>>
>>> What am I missing here?
>>
>> Thanks four your detailed review. I did see the code and not sure if
>> brcmf_notify_escan_complete
>> would be triggered for sure. So in the first version I want to delete
>> the pending timer ahead of time.
>
> Why requesting a CVE when you are not sure? Seems a bit hasty to put
> it mildly.

TBH I don't take CVE entries seriously anymore. I don't know what has
happened there.

-- 
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