diff --git a/drivers/iommu/intel/iommu.c b/drivers/iommu/intel/iommu.c
index 50eb9aed47cc58..59be874a38b81c 100644
--- a/drivers/iommu/intel/iommu.c
+++ b/drivers/iommu/intel/iommu.c
@@ -570,6 +570,9 @@ is_downstream_to_pci_bridge(struct device *dev, struct device *bridge)
 {
 	struct pci_dev *pdev, *pbridge;
 
+	if (!dev)
+		return false
+
 	if (!dev_is_pci(dev) || !dev_is_pci(bridge))
 		return false;