virtio: console: Check if port is valid in resize_console

The console port could have been hot-unplugged. Check if it is valid
before working on it.

Signed-off-by: Amit Shah <amit.shah@redhat.com>
Signed-off-by: Michael S. Tsirkin <mst@redhat.com>

diff --git a/drivers/char/virtio_console.c b/drivers/char/virtio_console.c
index 67b474b4167c070616d35a4f7bca0815e4aac664..44288ce0cb45520b144d9eec98a942c7812025c7 100644 (file)
--- a/drivers/char/virtio_console.c
+++ b/drivers/char/virtio_console.c
@@ -681,6 +681,10 @@ static void resize_console(struct port *port)
        struct virtio_device *vdev;
        struct winsize ws;
 
+       /* The port could have been hot-unplugged */
+       if (!port)
+               return;
+
        vdev = port->portdev->vdev;
        if (virtio_has_feature(vdev, VIRTIO_CONSOLE_F_SIZE)) {
                vdev->config->get(vdev,