linux-kernel - Re: [PATCH v1 1/6] virtio console: Harden multiport against invalid host input

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Message-ID: <874jslqk4x.fsf@ubik.fi.intel.com>
Date:   Fri, 20 Jan 2023 17:51:42 +0200
From:   Alexander Shishkin <alexander.shishkin@...ux.intel.com>
To:     "Michael S. Tsirkin" <mst@...hat.com>
Cc:     jasowang@...hat.com, virtualization@...ts.linux-foundation.org,
        linux-kernel@...r.kernel.org, elena.reshetova@...el.com,
        kirill.shutemov@...ux.intel.com, Andi Kleen <ak@...ux.intel.com>,
        Amit Shah <amit@...nel.org>, Arnd Bergmann <arnd@...db.de>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        alexander.shishkin@...ux.intel.com
Subject: Re: [PATCH v1 1/6] virtio console: Harden multiport against invalid
 host input

"Michael S. Tsirkin" <mst@...hat.com> writes:

> Weird.  Don't we already check for that?
>
>         /* Don't test MULTIPORT at all if we're rproc: not a valid feature! */
>         if (!is_rproc_serial(vdev) &&
>             virtio_cread_feature(vdev, VIRTIO_CONSOLE_F_MULTIPORT,
>                                  struct virtio_console_config, max_nr_ports,
>                                  &portdev->max_nr_ports) == 0) {
>                 if (portdev->max_nr_ports == 0 ||
>                     portdev->max_nr_ports > VIRTCONS_MAX_PORTS) {
>                         dev_err(&vdev->dev,
>                                 "Invalidate max_nr_ports %d",
>                                 portdev->max_nr_ports);
>                         err = -EINVAL;
>                         goto free;
>                 }
>                 multiport = true;
>         }

Yes, I missed this earlier. I'll drop this patch.

Thanks,
--
Alex