This is a static dump of issues in the old "Flyspray" bugtracker for DokuWiki. Bugs and feature requests
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Your patch will make use of an empty search base (which probably means that the whole tree is searched). The more correct variant is to use a correct search base in $conf['auth']['ldap']['grouptree']. If you really need to search the whole directory then set the base of the directory (that's what RootDSE in the docs probably is supposed to mean).
2010-06-27kirill
For now I set
if ($this->cnf['grouptree'] ¦¦ $this->cnf['groupfilter']) {
Okay it really seems like your LDAP directory has no root. Personally I think that this is an error in how your directory was setup and I'm surprised this is even possible.
But since seems to be a valid real life config, I applied your patch.