(ITS#6824) slap_sasl2dn can erroneously set c_authz_backend

[masarati@aero.polimi.it]

Full_Name: Pierangelo Masarati
Version: HEAD/re24
OS: irrelevant
URL: ftp://ftp.openldap.org/incoming/
Submission from: (NULL) (2.40.0.119)
Submitted by: ando


slap_sasl2dn may set c_authz_backend; however, this function can be called
concurrently by multiple operations without mutex protection, and under
erroneous conditions (e.g. while applying the proxied authorization control).

Not exactly sure about ho to proceed; I assume this should only happen during
SASL bind.

p.