linux-kernel - Re: KASAN: null-ptr-deref Write in io_file_get

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Date:   Tue, 16 Aug 2022 10:57:39 -0600
From:   Jens Axboe <axboe@...nel.dk>
To:     Greg KH <gregkh@...uxfoundation.org>,
        Jiacheng Xu <578001344xu@...il.com>
Cc:     linux-kernel@...r.kernel.org, asml.silence@...il.co,
        io-uring@...r.kernel.org, security@...nel.org
Subject: Re: KASAN: null-ptr-deref Write in io_file_get_normal

On 8/16/22 10:21 AM, Greg KH wrote:
> On Wed, Aug 17, 2022 at 12:10:09AM +0800, Jiacheng Xu wrote:
>> Hello,
>>
>> When using modified Syzkaller to fuzz the Linux kernel-5.15.58, the
>> following crash was triggered.
> 
> As you sent this to public lists, there's no need to also cc:
> security@k.o as there's nothing we can do about this.

Indeed...

> Also, random syzbot submissions are best sent with a fix for them,
> otherwise it might be a while before they will be looked at.

Greg, can you cherrypick:

commit 386e4fb6962b9f248a80f8870aea0870ca603e89
Author: Jens Axboe <axboe@...nel.dk>
Date:   Thu Jun 23 11:06:43 2022 -0600

    io_uring: use original request task for inflight tracking

into 5.15-stable? It should pick cleanly and also fix this issue.

-- 
Jens Axboe