Created attachment 387 [details]
Infoblox fix for the problem

Here are the high-level defect reproduction steps:

- define an empty view in configuration, e.g.
    view:
    name: view3

(note there are no local zones defined for this view)

- start unbound configured for remote control

- add one local zone to this view via remote command:
    $ unbound-control view_local_zone view3 abc.com always_nxdomain

- observe the crash

In our environment this problem was fixed with the attached patch. This patch does introduce a potential for some heap waste, however this is not expected to become a serious issue.

Note also that the potential for similar bug exists with the per-view respip configuration as well. Currently this is not an issue (at least not in our environment), as the remote command for defining the per-view respip directives is not yet implemented.