https://bugs.openldap.org/show_bug.cgi?id=9991

Issue ID: 9991 Summary: slapd may close a connection twice Product: OpenLDAP Version: 2.5.13 Hardware: All OS: All Status: UNCONFIRMED Keywords: needs_review Severity: normal Priority: --- Component: slapd Assignee: bugs@openldap.org Reporter: hyc@openldap.org Target Milestone: ---

If slapd is sending an entry to a client, and the client is sending an Unbind request and disconnecting at the same time, send_ldap_ber() will get an error attempting to write on the dead socket. It will then try to call connection_closing() to close the connection. But the frontend may also have gotten a read error on the dead socket, and handled the close there already.

By the time send_ldap_ber() acquires the c_mutex and actually calls connection_closing(), the conn struct may have already been assigned to a new connection, and the connection_closing() call will erroneously close an active session.