vhost: fix potential null pointer dereference

Coverity issue: 293097
Fixes: d90cf7d111ac ("vhost: support host notifier")
Signed-off-by: Tiwei Bie <tiwei.bie@intel.com>
Reviewed-by: Maxime Coquelin <maxime.coquelin@redhat.com>

diff --git a/lib/librte_vhost/vhost_user.c b/lib/librte_vhost/vhost_user.c
index 26cfebec0753c94f14d29f22a6f604f715dd7488..bea6a0428a00396d22a144d959e151761e663455 100644 (file)
--- a/lib/librte_vhost/vhost_user.c
+++ b/lib/librte_vhost/vhost_user.c
@@ -1830,6 +1830,8 @@ int vhost_user_host_notifier_ctrl(int vid, bool enable)
                return -ENOTSUP;
 
        vdpa_dev = rte_vdpa_get_device(did);
+       if (!vdpa_dev)
+               return -ENODEV;
 
        RTE_FUNC_PTR_OR_ERR_RET(vdpa_dev->ops->get_vfio_device_fd, -ENOTSUP);
        RTE_FUNC_PTR_OR_ERR_RET(vdpa_dev->ops->get_notify_area, -ENOTSUP);