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(ITS#5636) performance improvement in ACI evaluation

Full_Name: Stefanos Stamatis
Version: 2.4.11
OS: Solaris
URL: ftp://ftp.openldap.org/incoming/stefanos-stamatis-080801.diff
Submission from: (NULL) (

The function 'aci_mask' in servers/slapd/aci.c will evaluate the type and
subject part of an ACI even if the 'action;rights;attr;' part of the ACI does
not apply. This is bad for performance, especially if the subject is a set which
dereferences the objects 'user' or 'this'. The referenced patch solves this
issue by fixing 'aci_list_get_rights' to return 0 if the returned mask does not
effect a change.