linux-kernel - Re: [PATCH 1/1] vhost: Protect the virtqueue from being cleared whilst still in use

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Message-ID: <Yi8DLVFyczFreWn7@kroah.com>
Date:   Mon, 14 Mar 2022 09:56:13 +0100
From:   Greg KH <gregkh@...uxfoundation.org>
To:     Lee Jones <lee.jones@...aro.org>
Cc:     mst@...hat.com, jasowang@...hat.com, linux-kernel@...r.kernel.org,
        kvm@...r.kernel.org, virtualization@...ts.linux-foundation.org,
        netdev@...r.kernel.org, stable@...r.kernel.org
Subject: Re: [PATCH 1/1] vhost: Protect the virtqueue from being cleared
 whilst still in use

On Mon, Mar 14, 2022 at 08:43:02AM +0000, Lee Jones wrote:
> vhost_vsock_handle_tx_kick() already holds the mutex during its call
> to vhost_get_vq_desc().  All we have to do here is take the same lock
> during virtqueue clean-up and we mitigate the reported issues.
> 
> Also WARN() as a precautionary measure.  The purpose of this is to
> capture possible future race conditions which may pop up over time.

These two sentances do not match your actual patch :(

> Cc: <stable@...r.kernel.org>
> Signed-off-by: Lee Jones <lee.jones@...aro.org>

What commit caused this problem?  Can you add a Fixes: line as well for
this?

thanks,

greg k-h