--- a/drivers/iommu/intel-iommu.c	2017-02-24 23:29:59.758656270 +0100
+++ b/drivers/iommu/intel-iommu.c	2017-02-24 23:30:29.672500523 +0100
@@ -915,7 +915,7 @@
 				 * which we used for the IOMMU lookup. Strictly speaking
 				 * we could do this for all PCI devices; we only need to
 				 * get the BDF# from the scope table for ACPI matches. */
-				if (pdev->is_virtfn)
+				if (pdev && pdev->is_virtfn)
 					goto got_pdev;
 
 				*bus = drhd->devices[i].bus;