fix: OpenLDAP crash in NSS shutdown handling

Resolves: #1158005

Related: #1231228 #1249977

Author: Jan Synacek <jsynacek@redhat.com>

Modified-By: Matus Honek <mhonek@redhat.com>

--- a/libraries/libldap/init.c

+++ b/libraries/libldap/init.c

@@ -473,7 +473,7 @@ static void openldap_ldap_init_w_env(

  * Sorry, don't know how to handle this for non-GCC environments.

  */

 static void ldap_int_destroy_global_options(void)

-	__attribute__ ((destructor));

+	__attribute__ ((destructor (2)));

 #endif

 static void

--- a/libraries/libldap/tls_m.c

+++ b/libraries/libldap/tls_m.c

@@ -1931,6 +1931,18 @@ tlsm_clientauth_init( tlsm_ctx *ctx )

 	return ( status == SECSuccess ? 0 : -1 );

 }

+#if defined(__GNUC__)

+static void

+tlsm_destroy_on_unload(void) __attribute__ ((destructor (1)));

+

+static void

+tlsm_destroy_on_unload(void)

+{

+	if (NSS_IsInitialized())

+		NSS_UnregisterShutdown(tlsm_nss_shutdown_cb, NULL);

+}

+#endif

+

 /*

  * Tear down the TLS subsystem. Should only be called once.

  */