[PATCH] iommu: fix resource leak in iommu_group_alloc

[Yuan Can]

When it fails to create file for reserved_regions and type
of an iommu_group, the iommu_group_alloc returns ERR_PTR
without releasing the iommu_group.
Add error handling to cleanup leaking resources.

Signed-off-by: Yuan Can <yuancan@xxxxxxxxxx>
---
 drivers/iommu/iommu.c | 11 +++++++++--
 1 file changed, 9 insertions(+), 2 deletions(-)

diff --git a/drivers/iommu/iommu.c b/drivers/iommu/iommu.c
index 1ca59afc8472..fff23231b5fc 100644
--- a/drivers/iommu/iommu.c
+++ b/drivers/iommu/iommu.c
@@ -675,15 +675,22 @@ struct iommu_group *iommu_group_alloc(void)
 	ret = iommu_group_create_file(group,
 				      &iommu_group_attr_reserved_regions);
 	if (ret)
-		return ERR_PTR(ret);
+		goto out_put_group;
 
 	ret = iommu_group_create_file(group, &iommu_group_attr_type);
 	if (ret)
-		return ERR_PTR(ret);
+		goto out_remove_file;
 
 	pr_debug("Allocated group %d\n", group->id);
 
 	return group;
+
+out_remove_file:
+	iommu_group_remove_file(group, &iommu_group_attr_reserved_regions);
+out_put_group:
+	iommu_group_put(group);
+
+	return ERR_PTR(ret);
 }
 EXPORT_SYMBOL_GPL(iommu_group_alloc);
 
-- 
2.17.1