On 06/10/2016 05:23 PM, Ludwig Krispenz wrote:

On 06/10/2016 04:44 PM, thierry bordaz wrote:
Hi Ludwig,

I agree with you there is no path to add a host with an empty hostname.
You fix looks valid but I would prefer a log in FATAL rather in PLUGIN.
yes, of course that was my intention, copy paste :-)

Also I wonder if a reason of empty hostname could be a slapi_ch_free on it but with the host remaining in the list. Looking at https://git.fedorahosted.org/cgit/freeipa.git/tree/daemons/ipa-slapi-plugins/topology/topology_cfg.c#n852,
I wonder if the two lines 852 and 853 could lead to this situation.
but this frees the complete replica structure tconf and in the caller tconf is set to null, so should never be used again.

Yes you are right, it can not conduct to empty hostname into tconf.
However I think it can leak because host will be set to 0 at the end of the first iteration.

An other possibility is that in
ipa_topo_util_init_hosts, 'cn' has an empty value. newhost is not null but empty, so we may create an empty hostname.


On 06/10/2016 12:36 PM, Ludwig Krispenz wrote:
the attached patch will prevent the crash reported in ticket #5928.

So far I do not understand how this situation can occur, there is no reproducer yet. I do not really like this fix as it hides a probable corrupted data structure and would prefer to find the root cause.

But please review it, so we can commit it if there is no progress on the root cause.


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