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Date:   Fri, 27 Jan 2023 08:34:04 +0100
From:   Greg KH <gregkh@linuxfoundation.org>
To:     Pavel Begunkov <asml.silence@gmail.com>
Cc:     stable@vger.kernel.org, Jens Axboe <axboe@kernel.dk>
Subject: Re: [PATCH stable-6.1 1/1] io_uring/msg_ring: fix remote queue to
 disabled ring
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On Mon, Jan 23, 2023 at 03:29:25PM +0000, Pavel Begunkov wrote:
> On 1/23/23 15:23, Greg KH wrote:
> > On Mon, Jan 23, 2023 at 03:03:24PM +0000, Pavel Begunkov wrote:
> > > [ upstream commit 8579538c89e33ce78be2feb41e07489c8cbf8f31 ]
> > > 
> > > IORING_SETUP_R_DISABLED rings don't have the submitter task set, so
> > > it's not always safe to use ->submitter_task. Disallow posting msg_ring
> > > messaged to disabled rings. Also add task NULL check for loosy sync
> > > around testing for IORING_SETUP_R_DISABLED.
> > > 
> > > Cc: stable@vger.kernel.org
> > > Fixes: 6d043ee1164ca ("io_uring: do msg_ring in target task via tw")
> > 
> > This commit is only in 6.2-rc1, so is it really relevant for this commit
> > to go to 6.1?
> In short, yes.
> 
> 
> The upstream commit fixes a bug in 6.2, that's the Fixes tag, but
> it also adjusts behaviour of the feature, which came in earlier
> kernels. My bad I didn't split the patch in two.
> 
> I also thought Jens added a second Fixes tag but it's not there.
> 
> Fixes: 4f57f06ce2186 ("io_uring: add support for IORING_OP_MSG_RING command")

Great, now queued up, thanks!

greg k-h