S4: SEGV in acl_validate_spn_value: dnsHostName NULL

Arvid Requate requate at univention.de
Fri Mar 2 06:34:54 MST 2012


this is a proposal for a patch addressing segmentation faults due to a 
dnsHostName NULL pointer in acl_validate_spn_value. Diff is attached. The 
segfault closes all sockets in /var/run/samba/ncalrpc effecting netlogon and 
replication failures. The issue seems to be triggered in situations where 
clients attempt to register a new SPN while their SAM account object does not 
provide a value for the "dnsHostName" attribute. This seems to be the case for 
machine accounts in domains migrated by samba3upgrade.


Arvid Requate
Open Source Software Engineer

Univention GmbH
Linux for your business
28359 Bremen
Tel. : +49 421 22232-0
Fax : +49 421 22232-99

requate at univention.de

Geschäftsführer: Peter H. Ganten
HRB 20755 Amtsgericht Bremen
Steuer-Nr.: 71-597-02876 
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