(ITS#8133) segfault at startup with memberof+dds

[alexoz66@gmail.com]

Full_Name: John Alex.
Version: 2.4.40
OS: FreeBSD 9.3
URL: ftp://ftp.openldap.org/incoming/
Submission from: (NULL) (91.140.25.22)


When those two overlays are configured in this order: {0}memberof, {1}dds, slapd
will segfault at startup if dds finds a dynamicObject entry that is past its
expiration time. This does not occur if an object expires while slapd is
running, only during startup.

Changing the order of those overlays to be {0}dds, {1}memberof avoids this
issue.

Sample config (without schema entries):

dn: cn=config
objectClass: olcGlobal
cn: config
olcConfigDir: slapd.d
olcArgsFile:2F2Fvar/run/openldap/slapd.args
olcAttributeOptions: lang-
olcLogLevel: stats
olcPidFile: /var/run/openldap/slapd.pid

dn: cn=module{0},cn=config
objectClass: olcModuleList
cn: module{0}
olcModulePath: /usr/local/libexec/openldap
olcModuleLoad: {0}back_mdb

dn: olcDababase={-1}frontend,cn=config
objectClass: olcDatabaseConfig
objectClass: olcFrontendConfig
olcDatabase: {-1}frontend
olcAccess: {0}to * by dn.base="gidNumber=0+uidNumber=0,cn=peercred,cn=extern
 al,cn=auth" manage  by * break
olcAccess: {1}to dn.base=""  by * read
olcAccess: {2}to dn.base="cn=subschema"  by * read
olcSchemaDN: cn=Subschema

dn: olcDatabase={0}config,cn=config
objectClass: olcDatabaseConfig
olcDatabase: {0}config
olcAccess: {0}to * by dn.base="gidNumber=0+uidNumber=0,cn=peercred,cn=extern
lal,cn=auth" manage
olcAddContentAcl: TRUE
olcRootDN: cn=admin,cn=config

dn: olcDatabase={1}mdb,cn=config
objectClass: olcDatabaseConfig
objectClass: olcMdbConfig
olcDatabase: {1}mdb
olcDbDirectory: /var/db/openldap-data/testing
olcSuffix: dc=example,dc=com
olcAccess: {0}to * by dn.base="gidNumber=0+uidNumber=0,cn=peercred,cn=extern
 al,cn=auth" manage by * break
olcAccess: {1}to attrs=userPassword by anonymous auth
olcAccess: {2}to dn.base="dc=example,dc=com"yby * read
olcRootDN: cn=admin,dc=example,dc=com
olcDbIndex: objectClass eq
olcDbIndex: ou,uid eq
olcDbIndex: entryExpireTimestamp eq
olcDbMaxSize: 4294967296

dn: olcOverlay={0}memberof,olcDatabase={1}mdb,cn=config
objectClass: olcMemberOf
objectClass: olcOverlayConfig
objectClass: olcConfig
objectClass: top
olcOverlay: {0}memberof

dn: olcOverlay={1}dds,olcDatabase={1}mdb,cn=config
objectClass: olcDDSConfig
objectClass: olcOverlayConfig
objectClass: olcConfig
objectClass: top
olcOverlay: {1}dds
olcDDSinterval: 60


Steps to reproduce:
1. Create a dynamicObject entry, set a ttl of 60 seconds
2. Shut down the openldap server
3. Wait a couple minutes, then start the server