RE: [PATCH rdma-rc] RDMA/ucma: Fix access to non-initialized CM_ID object

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> > rdma_join_multicast() includes state checks which are intended to
> validate that the cm_id is in a valid state.  It may make more sense
> to expand those checks with a device check, since the state checks
> alone are insufficient.
> 
> Do you know why these checks not enough? Why did the change state
> without cm_id->device?

I believe the cm_id can be bound to a wildcard address (state RDMA_CM_ADDR_BOUND), which would leave device unset.  RDMA_CM_ADDR_BOUND is used in both the wildcard and non-wildcard case.
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