linux-kernel - Re: [syzbot] BUG: unable to handle kernel NULL pointer dereference in io_do

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Message-ID: <8cf1ef4e-03b6-4da2-530f-65058c57a9d1@kernel.dk>
Date:   Tue, 17 May 2022 12:34:00 -0600
From:   Jens Axboe <axboe@...nel.dk>
To:     syzbot <syzbot+1a0a53300ce782f8b3ad@...kaller.appspotmail.com>,
        asml.silence@...il.com, io-uring@...r.kernel.org,
        linux-kernel@...r.kernel.org, syzkaller-bugs@...glegroups.com
Subject: Re: [syzbot] BUG: unable to handle kernel NULL pointer dereference in
 io_do_iopoll

On 5/17/22 12:13 PM, syzbot wrote:
> Hello,
> 
> syzbot found the following issue on:
> 
> HEAD commit:    42226c989789 Linux 5.18-rc7
> git tree:       upstream
> console+strace: https://syzkaller.appspot.com/x/log.txt?x=125b807ef00000
> kernel config:  https://syzkaller.appspot.com/x/.config?x=902c5209311d387c
> dashboard link: https://syzkaller.appspot.com/bug?extid=1a0a53300ce782f8b3ad
> compiler:       gcc (Debian 10.2.1-6) 10.2.1 20210110, GNU ld (GNU Binutils for Debian) 2.35.2
> syz repro:      https://syzkaller.appspot.com/x/repro.syz?x=149eb59ef00000
> C reproducer:   https://syzkaller.appspot.com/x/repro.c?x=17cc57c6f00000
> 
> The issue was bisected to:
> 
> commit 3f1d52abf098c85b177b8c6f5b310e8347d1bc42
> Author: Jens Axboe <axboe@...nel.dk>
> Date:   Tue Mar 29 16:43:56 2022 +0000
> 
>     io_uring: defer msg-ring file validity check until command issue

#syz test git://git.kernel.dk/linux-block io_uring-5.18

-- 
Jens Axboe