diff --git a/drivers/iommu/intel/iommu.c b/drivers/iommu/intel/iommu.c
index 606c4f6f3d849b9a35b30b3e831b7c9a103f6a7c..fe94013e9a620352c3f74e2908f54d3b807b39f8 100644
--- a/drivers/iommu/intel/iommu.c
+++ b/drivers/iommu/intel/iommu.c
@@ -5262,6 +5262,8 @@ static int auxiliary_link_device(struct dmar_domain *domain,
 
 	if (!sinfo) {
 		sinfo = kzalloc(sizeof(*sinfo), GFP_ATOMIC);
+		if (!sinfo)
+			return -ENOMEM;
 		sinfo->domain = domain;
 		sinfo->pdev = dev;
 		list_add(&sinfo->link_phys, &info->subdevices);