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>

1 files changed, 4 insertions, 0 deletions

diff --git a/drivers/net/caif/caif_virtio.c b/drivers/net/caif/caif_virtio.c
index fb80765e258e..316b184ea130 100644
--- 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;