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As in, remaining_uses is mutable?

** Information type changed from Public to Public Security

** Changed in: keystone
   Importance: Undecided => High

** Tags added: security

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https://bugs.launchpad.net/bugs/1472057

Title:
  in the function of create_trust,the judgment for “remaining_uses” can
  be deleted

Status in OpenStack Identity (Keystone):
  Incomplete

Bug description:
  In the function of create_trust (Corresponding file is:/keystone/trust/core.py),the judgment for “remaining_uses” can be deleted,
  because controller has registered a schema to validate a resource reference.

  if not redelegatable:
              trust['redelegation_count'] = requested_count = 0
              remaining_uses = trust.get('remaining_uses')
              if remaining_uses is not None and remaining_uses <= 0:  # i think this judgment redundancy
                  msg = _('remaining_uses must be a positive integer or null.')
                  raise exception.ValidationError(msg)

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