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Description of problem:
When sssd returns rules to sudo and all rules are filtered out, sudo calls erealloc3(0).

How reproducible:
always

Steps to Reproduce:
1. Configure sudo to use sssd
2. Create a sudo rule with:
sudoUser: tuser
sudoCommand: ALL
but without sudoHost attibute
3. Run sudo -l as tuser

Actual results:
$ sudo -l
sudo: internal error, tried to erealloc3(0)

Expected results:
$ sudo -l
User tuser is not allowed to run sudo on client.

Additional info:
Patch attached.

Created attachment 789555 [details]
proposed patch

This request was resolved in Red Hat Enterprise Linux 7.0.

Contact your manager or support representative in case you have further questions about the request.