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From:   Alexander Shishkin <alexander.shishkin@linux.intel.com>
To:     "Michael S. Tsirkin" <mst@redhat.com>
Cc:     jasowang@redhat.com, virtualization@lists.linux-foundation.org,
        linux-kernel@vger.kernel.org, elena.reshetova@intel.com,
        kirill.shutemov@linux.intel.com, Andi Kleen <ak@linux.intel.com>,
        Amit Shah <amit@kernel.org>, Arnd Bergmann <arnd@arndb.de>,
        Greg Kroah-Hartman <gregkh@linuxfoundation.org>,
        alexander.shishkin@linux.intel.com
Subject: Re: [PATCH v1 1/6] virtio console: Harden multiport against invalid
 host input
In-Reply-To: <20230120080130-mutt-send-email-mst@kernel.org>
References: <20230119135721.83345-1-alexander.shishkin@linux.intel.com>
 <20230119135721.83345-2-alexander.shishkin@linux.intel.com>
 <20230120080130-mutt-send-email-mst@kernel.org>
Date:   Fri, 20 Jan 2023 17:51:42 +0200
Message-ID: <874jslqk4x.fsf@ubik.fi.intel.com>
MIME-Version: 1.0
Content-Type: text/plain
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"Michael S. Tsirkin" <mst@redhat.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