vhost: fix error handling in destroy

Fix following coverity defect:

    291     void
    292     vhost_destroy_device(struct vhost_device_ctx ctx)
    293     {
    294             struct virtio_net *dev = get_device(ctx);
    295
    >>>     CID 124565:  Null pointer dereferences  (NULL_RETURNS)
    >>>     Dereferencing a null pointer "dev".

Fixes: 45ca9c6f7bc6 ("vhost: get rid of linked list for devices")

Reported-by: John McNamara <john.mcnamara@intel.com>
Signed-off-by: Yuanhan Liu <yuanhan.liu@linux.intel.com>

diff --git a/lib/librte_vhost/virtio-net.c b/lib/librte_vhost/virtio-net.c
index 90da9ba..d870ad9 100644 (file)
--- a/lib/librte_vhost/virtio-net.c
+++ b/lib/librte_vhost/virtio-net.c
@@ -293,6 +293,9 @@ vhost_destroy_device(struct vhost_device_ctx ctx)
 {
        struct virtio_net *dev = get_device(ctx);
 
+       if (dev == NULL)
+               return;
+
        if (dev->flags & VIRTIO_DEV_RUNNING)
                notify_ops->destroy_device(dev);