linux-kernel - Re: [regression] Bug 216932 - io_uring with libvirt cause kernel NULL pointer dereference since 6.1.5

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Message-ID: <a862915b-66f3-9ad8-77d4-4b9ce7044037@kernel.dk>
Date:   Mon, 16 Jan 2023 07:13:40 -0700
From:   Jens Axboe <axboe@...nel.dk>
To:     Linux regressions mailing list <regressions@...ts.linux.dev>
Cc:     "stable@...r.kernel.org" <stable@...r.kernel.org>,
        io-uring@...r.kernel.org, LKML <linux-kernel@...r.kernel.org>,
        "Sergey V." <truesmb@...il.com>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>
Subject: Re: [regression] Bug 216932 - io_uring with libvirt cause kernel NULL pointer dereference since 6.1.5

On 1/16/23 6:42 AM, Jens Axboe wrote:
> On 1/16/23 6:17?AM, Linux kernel regression tracking (Thorsten Leemhuis) wrote:
>> Hi, this is your Linux kernel regression tracker.
>>
>> I noticed a regression report in bugzilla.kernel.org. As many (most?)
>> kernel developer don't keep an eye on it, I decided to forward it by
>> mail. Quoting from https://bugzilla.kernel.org/show_bug.cgi?id=216932 :
> 
> Looks like:
> 
> commit 6d47e0f6a535701134d950db65eb8fe1edf0b575
> Author: Jens Axboe <axboe@...nel.dk>
> Date:   Wed Jan 4 08:52:06 2023 -0700
> 
>     block: don't allow splitting of a REQ_NOWAIT bio
> 
> got picked up by stable, but not the required prep patch:
> 
> 
> commit 613b14884b8595e20b9fac4126bf627313827fbe
> Author: Jens Axboe <axboe@...nel.dk>
> Date:   Wed Jan 4 08:51:19 2023 -0700
> 
>     block: handle bio_split_to_limits() NULL return
> 
> Greg/team, can you pick the latter too? It'll pick cleanly for
> 6.1-stable, not sure how far back the other patch has gone yet.

Looked back, and 5.15 has it too, but the cherry-pick won't work
on that kernel.

Here's one for 5.15-stable that I verified crashes before this one,
and works with it. Haven't done an allmodconfig yet...

-- 
Jens Axboe


View attachment "0001-block-handle-bio_split_to_limits-NULL-return.patch" of type "text/x-patch" (4561 bytes)