Merge tag 'for-linus-iommufd' of git://git.kernel.org/pub/scm/linux/kernel/git/jgg/iommufd

Pull iommufd fixes from Jason Gunthorpe:

 - A small fix for the dirty tracking self test to fail correctly if the
   code is buggy

 - Fix a tricky syzkaller race UAF with object reference counting

* tag 'for-linus-iommufd' of git://git.kernel.org/pub/scm/linux/kernel/git/jgg/iommufd:
  iommufd: Do not UAF during iommufd_put_object()
  iommufd: Add iommufd_ctx to iommufd_put_object()
  iommufd/selftest: Fix _test_mock_dirty_bitmaps()

1 files changed, 7 insertions, 7 deletions

diff --git a/drivers/iommu/iommufd/device.c b/drivers/iommu/iommufd/device.c
index 59d3a07300d9..873630c111c1 100644
--- a/drivers/iommu/iommufd/device.c
+++ b/drivers/iommu/iommufd/device.c
@@ -571,7 +571,7 @@ iommufd_device_auto_get_domain(struct iommufd_device *idev,
 			continue;
 		destroy_hwpt = (*do_attach)(idev, hwpt);
 		if (IS_ERR(destroy_hwpt)) {
-			iommufd_put_object(&hwpt->obj);
+			iommufd_put_object(idev->ictx, &hwpt->obj);
 			/*
 			 * -EINVAL means the domain is incompatible with the
 			 * device. Other error codes should propagate to
@@ -583,7 +583,7 @@ iommufd_device_auto_get_domain(struct iommufd_device *idev,
 			goto out_unlock;
 		}
 		*pt_id = hwpt->obj.id;
-		iommufd_put_object(&hwpt->obj);
+		iommufd_put_object(idev->ictx, &hwpt->obj);
 		goto out_unlock;
 	}
 
@@ -652,7 +652,7 @@ static int iommufd_device_change_pt(struct iommufd_device *idev, u32 *pt_id,
 		destroy_hwpt = ERR_PTR(-EINVAL);
 		goto out_put_pt_obj;
 	}
-	iommufd_put_object(pt_obj);
+	iommufd_put_object(idev->ictx, pt_obj);
 
 	/* This destruction has to be after we unlock everything */
 	if (destroy_hwpt)
@@ -660,7 +660,7 @@ static int iommufd_device_change_pt(struct iommufd_device *idev, u32 *pt_id,
 	return 0;
 
 out_put_pt_obj:
-	iommufd_put_object(pt_obj);
+	iommufd_put_object(idev->ictx, pt_obj);
 	return PTR_ERR(destroy_hwpt);
 }
 
@@ -792,7 +792,7 @@ static int iommufd_access_change_ioas_id(struct iommufd_access *access, u32 id)
 	if (IS_ERR(ioas))
 		return PTR_ERR(ioas);
 	rc = iommufd_access_change_ioas(access, ioas);
-	iommufd_put_object(&ioas->obj);
+	iommufd_put_object(access->ictx, &ioas->obj);
 	return rc;
 }
 
@@ -941,7 +941,7 @@ void iommufd_access_notify_unmap(struct io_pagetable *iopt, unsigned long iova,
 
 		access->ops->unmap(access->data, iova, length);
 
-		iommufd_put_object(&access->obj);
+		iommufd_put_object(access->ictx, &access->obj);
 		xa_lock(&ioas->iopt.access_list);
 	}
 	xa_unlock(&ioas->iopt.access_list);
@@ -1243,6 +1243,6 @@ int iommufd_get_hw_info(struct iommufd_ucmd *ucmd)
 out_free:
 	kfree(data);
 out_put:
-	iommufd_put_object(&idev->obj);
+	iommufd_put_object(ucmd->ictx, &idev->obj);
 	return rc;
 }