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

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Message-ID: <4aabf060-e024-7e6f-2037-8b13a35531ca@kernel.dk>
Date:   Mon, 16 Jan 2023 06:43:53 -0700
From:   Jens Axboe <axboe@...nel.dk>
To:     syzbot <syzbot+cb95143d1d4d788c1941@...kaller.appspotmail.com>,
        asml.silence@...il.com, io-uring@...r.kernel.org,
        linux-kernel@...r.kernel.org, syzkaller-bugs@...glegroups.com
Subject: Re: [syzbot] KASAN: use-after-free Read in io_poll_task_func

On 1/15/23 11:11 PM, syzbot wrote:
> Hello,
> 
> syzbot found the following issue on:
> 
> HEAD commit:    0a093b2893c7 Add linux-next specific files for 20230112
> git tree:       linux-next
> console output: https://syzkaller.appspot.com/x/log.txt?x=12fcd936480000
> kernel config:  https://syzkaller.appspot.com/x/.config?x=835f3591019836d5
> dashboard link: https://syzkaller.appspot.com/bug?extid=cb95143d1d4d788c1941
> compiler:       gcc (Debian 10.2.1-6) 10.2.1 20210110, GNU ld (GNU Binutils for Debian) 2.35.2

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

-- 
Jens Axboe