iommufd: Check the domain owner of the parent before creating a nesting domain
This check was missed, before we can pass a struct iommu_domain to a
driver callback we need to validate that the domain was created by that
driver.
Fixes: bd529dbb66
("iommufd: Add a nested HW pagetable object")
Link: https://patch.msgid.link/r/0-v1-c8770519edde+1a-iommufd_nesting_ops_jgg@nvidia.com
Reviewed-by: Nicolin Chen <nicolinc@nvidia.com>
Signed-off-by: Jason Gunthorpe <jgg@nvidia.com>
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@ -225,7 +225,8 @@ iommufd_hwpt_nested_alloc(struct iommufd_ctx *ictx,
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if ((flags & ~IOMMU_HWPT_FAULT_ID_VALID) ||
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!user_data->len || !ops->domain_alloc_user)
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return ERR_PTR(-EOPNOTSUPP);
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if (parent->auto_domain || !parent->nest_parent)
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if (parent->auto_domain || !parent->nest_parent ||
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parent->common.domain->owner != ops)
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return ERR_PTR(-EINVAL);
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hwpt_nested = __iommufd_object_alloc(
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