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[Alan Pevec <1451576@xxxxxxxxxxxxxxxxxx>]

** Also affects: neutron/kilo
   Importance: Undecided
       Status: New

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https://bugs.launchpad.net/bugs/1451576

Title:
  subnetpool allocation not ensuring non-overlapping cidrs

Status in neutron:
  In Progress
Status in neutron kilo series:
  New

Bug description:
  _get_allocated_cidrs[1] locks only allocated subnets in a subnetpool
  (with mysql/postgresql at least) which ensures we won't allocate a
  cidr overlapping with existent cidrs but nothing disallows a
  concurrent subnet allocation to create a subnet in the same
  subnetpool.

  [1]:
  https://github.com/openstack/neutron/blob/5962d825a6c98225c51bc6dd304b5c1ac89035etef/neutron/ipam/subnet_alloc.py#L40-L44

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