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

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Date:   Mon, 16 Jan 2023 15:49:43 +0100
From:   Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:     Jens Axboe <axboe@...nel.dk>
Cc:     Linux regressions mailing list <regressions@...ts.linux.dev>,
        "stable@...r.kernel.org" <stable@...r.kernel.org>,
        io-uring@...r.kernel.org, LKML <linux-kernel@...r.kernel.org>,
        "Sergey V." <truesmb@...il.com>
Subject: Re: [regression] Bug 216932 - io_uring with libvirt cause kernel
 NULL pointer dereference since 6.1.5

On Mon, Jan 16, 2023 at 07:13:40AM -0700, Jens Axboe wrote:
> 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...

All now queued up, thanks!

greg k-h