[PATCH 5.4 006/177] iommu/vt-d: Fix sysfs leak in alloc_iommu()

[Greg Kroah-Hartman]

From: Rolf Eike Beer <eb@xxxxxxxxx>

commit 0ee74d5a48635c848c20f152d0d488bf84641304 upstream.

iommu_device_sysfs_add() is called before, so is has to be cleaned on subsequent
errors.

Fixes: 39ab9555c2411 ("iommu: Add sysfs bindings for struct iommu_device")
Cc: stable@xxxxxxxxxxxxxxx # 4.11.x
Signed-off-by: Rolf Eike Beer <eb@xxxxxxxxx>
Acked-by: Lu Baolu <baolu.lu@xxxxxxxxxxxxxxx>
Link: https://lore.kernel.org/r/17411490.HIIP88n32C@xxxxxxxxxxxxxxxxxxxxxx
Link: https://lore.kernel.org/r/20210525070802.361755-2-baolu.lu@xxxxxxxxxxxxxxx
Signed-off-by: Joerg Roedel <jroedel@xxxxxxx>
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>
---
 drivers/iommu/dmar.c |    4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)

--- a/drivers/iommu/dmar.c
+++ b/drivers/iommu/dmar.c
@@ -1110,7 +1110,7 @@ static int alloc_iommu(struct dmar_drhd_
 
 		err = iommu_device_register(&iommu->iommu);
 		if (err)
-			goto err_unmap;
+			goto err_sysfs;
 	}
 
 	drhd->iommu = iommu;
@@ -1118,6 +1118,8 @@ static int alloc_iommu(struct dmar_drhd_
 
 	return 0;
 
+err_sysfs:
+	iommu_device_sysfs_remove(&iommu->iommu);
 err_unmap:
 	unmap_iommu(iommu);
 error_free_seq_id: