linux-kernel - Re: [syzbot] KASAN: use-after-free Read in __queue

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Date:   Fri, 14 May 2021 09:50:39 +0200
From:   Dmitry Vyukov <dvyukov@...gle.com>
To:     syzbot <syzbot+77e5e02c6c81136cdaff@...kaller.appspotmail.com>
Cc:     Markus Elfring <Markus.Elfring@....de>,
        Anant Thazhemadam <anant.thazhemadam@...il.com>,
        David Miller <davem@...emloft.net>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        Hillf Danton <hdanton@...a.com>,
        Johan Hedberg <johan.hedberg@...il.com>,
        Jakub Kicinski <kuba@...nel.org>, linma@....edu.cn,
        linux-bluetooth <linux-bluetooth@...r.kernel.org>,
        LKML <linux-kernel@...r.kernel.org>, luiz.dentz@...il.com,
        Marcel Holtmann <marcel@...tmann.org>, netdev@...r.kernel.org,
        syzkaller-bugs@...glegroups.com
Subject: Re: [syzbot] KASAN: use-after-free Read in __queue_work (3)

On Thu, May 13, 2021 at 6:27 PM syzbot
<syzbot+77e5e02c6c81136cdaff@...kaller.appspotmail.com> wrote:
>
> syzbot suspects this issue was fixed by commit:
>
> commit e2cb6b891ad2b8caa9131e3be70f45243df82a80
> Author: Lin Ma <linma@....edu.cn>
> Date:   Mon Apr 12 11:17:57 2021 +0000
>
>     bluetooth: eliminate the potential race condition when removing the HCI controller
>
> bisection log:  https://syzkaller.appspot.com/x/bisect.txt?x=127b3593d00000
> start commit:   c0842fbc random32: move the pseudo-random 32-bit definitio..
> git tree:       upstream
> kernel config:  https://syzkaller.appspot.com/x/.config?x=cf567e8c7428377e
> dashboard link: https://syzkaller.appspot.com/bug?extid=77e5e02c6c81136cdaff
> syz repro:      https://syzkaller.appspot.com/x/repro.syz?x=140e36a4900000
>
> If the result looks correct, please mark the issue as fixed by replying with:
>
> #syz fix: bluetooth: eliminate the potential race condition when removing the HCI controller
>
> For information about bisection process see: https://goo.gl/tpsmEJ#bisection


Looks reasonable based on the commit and bisection log.
Unfortunately I cannot easily send this as my email client will wrap
the commit title line (longer than 80 chars)...