Fixes a race condition that can be triggered when multiple threads

enter the function ldap_int_utils_init about the same time.

Patch was developed in-house; it is Solaris specific and

will not be contributed upstream.

--- openldap-2.4.44/libraries/libldap/util-int.c.old	2016-06-28 12:13:02.410770969 -0700

+++ openldap-2.4.44/libraries/libldap/util-int.c	2016-06-28 12:13:07.923164035 -0700

@@ -92,6 +92,10 @@

 	/* Don't know how to handle this version, pretend it's not there */

 #	undef HAVE_GETHOSTBYADDR_R

 # endif

+

+/* use static mutex to protect mutex initialization */

+static ldap_pvt_thread_mutex_t ldap_int_utils_init_mutex = PTHREAD_MUTEX_INITIALIZER;

+

 #endif /* LDAP_R_COMPILE */

 char *ldap_pvt_ctime( const time_t *tp, char *buf )

@@ -700,9 +704,17 @@

 	static int done=0;

 	if (done)

 	  return;

+#ifndef LDAP_R_COMPILE

	done=1;

+#endif

 #ifdef LDAP_R_COMPILE

+	/* use static mutex to protect mutex initialization */

+	(void) LDAP_MUTEX_LOCK(&ldap_int_utils_init_mutex);

+	if (done) {

+		(void) LDAP_MUTEX_UNLOCK(&ldap_int_utils_init_mutex);

+		return;

+	}

 #if !defined( USE_CTIME_R ) && !defined( HAVE_REENTRANT_FUNCTIONS )

 	ldap_pvt_thread_mutex_init( &ldap_int_ctime_mutex );

 #endif

@@ -718,9 +727,13 @@

 #ifdef HAVE_GSSAPI

 	ldap_pvt_thread_mutex_init( &ldap_int_gssapi_mutex );

 #endif

+ 

+	done=1;

+	/* use static mutex to protect mutex initialization */

+	(void) LDAP_MUTEX_UNLOCK(&ldap_int_utils_init_mutex);

 #endif

 	/* call other module init functions here... */

 }

 #if defined( NEED_COPY_HOSTENT )