diff --git a/drivers/vfio/pci/vfio_pci_dmabuf.c b/drivers/vfio/pci/vfio_pci_dmabuf.c
index fdc22e8b4656..1a177ce7de54 100644
--- a/drivers/vfio/pci/vfio_pci_dmabuf.c
+++ b/drivers/vfio/pci/vfio_pci_dmabuf.c
@@ -244,9 +244,11 @@ int vfio_pci_core_feature_dma_buf(struct vfio_pci_core_device *vdev, u32 flags,
 		return -EINVAL;
 
 	/*
-	 * For PCI the region_index is the BAR number like everything else.
+	 * For PCI the region_index is the BAR number like everything
+	 * else.  Check that PCI resources have been claimed for it.
 	 */
-	if (get_dma_buf.region_index >= VFIO_PCI_ROM_REGION_INDEX)
+	if (get_dma_buf.region_index >= VFIO_PCI_ROM_REGION_INDEX ||
+	    vfio_pci_core_setup_barmap(vdev, get_dma_buf.region_index))
 		return -ENODEV;
 
 	dma_ranges = memdup_array_user(&arg->dma_ranges, get_dma_buf.nr_ranges,