(ITS#8743) slaptest segfault with invalid back-meta configuration

Full_Name: Quanah Gibson-Mount Version: 2.4.45 OS: N/A URL: ftp://ftp.openldap.org/incoming/ Submission from: (NULL) (47.208.148.239)

When converting a slapd.conf file to cn=config, where the back-meta backend has an invalid configuration for the "filter" directive, slaptest will segfault. It would be better to detect an error and exit accordingly.

This is trivial to reproduce by using the following directive:

filter "(objectClass=*)"

as per slapd-meta(5), the "filter" directive takes a regex(5) rather than an LDAP filter. Still, it should not cause a segfault. ;)