(ITS#4195) matchedDN issues with back-meta

[ando@sys-net.it]

Full_Name: Pierangelo Masarati
Version: HEAD/re23
OS: irrelevant
URL: ftp://ftp.openldap.org/incoming/
Submission from: (NULL) (81.72.89.40)
Submitted by: ando


There's yet another minimal issue with back-meta, which returns a spurious
matchedDN when configured with (at least) a target that spans the entire naming
context, and another target that spans a subordinate of the naming context:

database        meta
suffix          dc=example,dc=com
uri             ldap://target0/dc=example,dc=com
uri             ldap://target1/ou=Subordinate,dc=example,dc=com

and a search is performed for that subordinate only,
"ou=Subordinate,dc=example,dc=com".  The first target is (correctly) returning
noSuchObject with a matchedDN of "dc=example,dc=com", and back-meta correctly
ignores the error code and returns the entire subtree of the second target. 
However, a "dangling" (logically; memory is handled correctly ;) matchedDN
remains around and is returned with the searchResult response.

A fix to HEAD is about to come.