caif_virtio: Check that vringh_config is not null

Check that vringh_config is not NULL before using it.

Signed-off-by: Sjur Brændeland <sjur.brandeland@stericsson.com>
Signed-off-by: Rusty Russell <rusty@rustcorp.com.au>

diff --git a/drivers/net/caif/caif_virtio.c b/drivers/net/caif/caif_virtio.c
index fb80765..316b184 100644 (file)
--- a/drivers/net/caif/caif_virtio.c
+++ b/drivers/net/caif/caif_virtio.c
@@ -670,6 +670,10 @@ static int cfv_probe(struct virtio_device *vdev)
        spin_lock_init(&cfv->tx_lock);
 
        /* Get the RX virtio ring. This is a "host side vring". */
+       err = -ENODEV;
+       if (!vdev->vringh_config || !vdev->vringh_config->find_vrhs)
+               goto err;
+
        err = vdev->vringh_config->find_vrhs(vdev, 1, &cfv->vr_rx, &vrh_cbs);
        if (err)
                goto err;