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

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Date:   Thu, 28 Apr 2022 08:34:13 -0700
From:   syzbot <syzbot+950cee6d91e62329be2c@...kaller.appspotmail.com>
To:     asml.silence@...il.com, axboe@...nel.dk,
        gregkh@...uxfoundation.org, io-uring@...r.kernel.org,
        jirislaby@...nel.org, linux-kernel@...r.kernel.org,
        syzkaller-bugs@...glegroups.com
Subject: Re: [syzbot] KASAN: use-after-free Read in add_wait_queue

syzbot suspects this issue was fixed by commit:

commit d89a4fac0fbc6fe5fc24d1c9a889440dcf410368
Author: Jens Axboe <axboe@...nel.dk>
Date:   Tue Mar 22 19:11:28 2022 +0000

    io_uring: fix assuming triggered poll waitqueue is the single poll

bisection log:  https://syzkaller.appspot.com/x/bisect.txt?x=17b70e42f00000
start commit:   b47d5a4f6b8d Merge tag 'audit-pr-20220321' of git://git.ke..
git tree:       upstream
kernel config:  https://syzkaller.appspot.com/x/.config?x=63af44f0631a5c3a
dashboard link: https://syzkaller.appspot.com/bug?extid=950cee6d91e62329be2c
syz repro:      https://syzkaller.appspot.com/x/repro.syz?x=14506ddb700000
C reproducer:   https://syzkaller.appspot.com/x/repro.c?x=139b2093700000

If the result looks correct, please mark the issue as fixed by replying with:

#syz fix: io_uring: fix assuming triggered poll waitqueue is the single poll

For information about bisection process see: https://goo.gl/tpsmEJ#bisection