iommu/vt-d: Check the return value of iommu_device_create()

This adds the proper check to alloc_iommu to make sure that
the call to iommu_device_create has completed successfully
and if not return the error code to the caller after freeing
up resources allocated previously.

Signed-off-by: Nicholas Krause <xerofoify@gmail.com>
Signed-off-by: Joerg Roedel <jroedel@suse.de>

1 files changed, 6 insertions, 0 deletions

diff --git a/drivers/iommu/dmar.c b/drivers/iommu/dmar.c
index 80e3c176008e..add177a37f00 100644
--- a/drivers/iommu/dmar.c
+++ b/drivers/iommu/dmar.c
@@ -1070,6 +1070,12 @@ static int alloc_iommu(struct dmar_drhd_unit *drhd)
                                                        intel_iommu_groups,
                                                        "%s", iommu->name);
 
+        if (IS_ERR(iommu->iommu_dev)) {
+                drhd->iommu = NULL;
+                err = PTR_ERR(iommu->iommu_dev);
+                goto err_unmap;
+        }
+
         return 0;
 
 err_unmap: