Milter-greylist

Hi,

with milter-greylist 4.2.3 on a CentOS5 platform I get segfaults[1] like

| Error Traversing Database for ipnum = 3645194514 - Perhaps database is corrupt?
| *** Segmentation fault
| Register dump:

This seems to happen when two hosts connect within a very short time. I
think that GeoIP_id_by_name() is called for the second host while this
function is still executed for the first one.  As both are operating on
the same 'geoip_handle' handle, this will corrupt internal state when
geoip is not reentrant.



Enrico

Footnotes: 
[1] see https://bugzilla.redhat.com/show_bug.cgi?id=511849#c18