linux-kernel - Re: [syzbot] [io-uring?] KASAN: use-after-free Read in io_worker

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Message-ID: <CANp29Y4WhUTNjUF1BPKDcSzUFx4Jb2uMHRsuezSewWZ9czWwtA@mail.gmail.com>
Date:   Wed, 15 Mar 2023 13:17:23 +0100
From:   Aleksandr Nogikh <nogikh@...gle.com>
To:     syzbot <syzbot+55cc59267340fad29512@...kaller.appspotmail.com>
Cc:     asml.silence@...il.com, axboe@...nel.dk, io-uring@...r.kernel.org,
        linux-kernel@...r.kernel.org, syzkaller-bugs@...glegroups.com
Subject: Re: [syzbot] [io-uring?] KASAN: use-after-free Read in io_worker_get

Looks reasonable

#syz fix: io_uring/io-wq: only free worker if it was allocated for creation


On Wed, Mar 15, 2023 at 6:35 AM syzbot
<syzbot+55cc59267340fad29512@...kaller.appspotmail.com> wrote:
>
> syzbot suspects this issue was fixed by commit:
>
> commit e6db6f9398dadcbc06318a133d4c44a2d3844e61
> Author: Jens Axboe <axboe@...nel.dk>
> Date:   Sun Jan 8 17:39:17 2023 +0000
>
>     io_uring/io-wq: only free worker if it was allocated for creation
>
> bisection log:  https://syzkaller.appspot.com/x/bisect.txt?x=108bc2e2c80000
> start commit:   a689b938df39 Merge tag 'block-2023-01-06' of git://git.ker..
> git tree:       upstream
> kernel config:  https://syzkaller.appspot.com/x/.config?x=33ad6720950f996d
> dashboard link: https://syzkaller.appspot.com/bug?extid=55cc59267340fad29512
> syz repro:      https://syzkaller.appspot.com/x/repro.syz?x=1532ef72480000
> C reproducer:   https://syzkaller.appspot.com/x/repro.c?x=10b43f3a480000
>
> If the result looks correct, please mark the issue as fixed by replying with:
>
> #syz fix: io_uring/io-wq: only free worker if it was allocated for creation
>
> For information about bisection process see: https://goo.gl/tpsmEJ#bisection
>