openldap: fix uninitialized ptr access problem

To be safe, the ldap_pvt_thread_pool_getkey() function should
always set the data parameter.  If this is not done, slapd can
segfault during shutdown.

Signed-off-by: Joe Slater <jslater@windriver.com>
Signed-off-by: Martin Jansa <Martin.Jansa@gmail.com>

meta-oe/recipes-support/openldap/openldap-2.4.39/thread_stub.patch

@@ -0,0 +1,20 @@
+openldap: set pointer
+
+When the function ldap_pvt_thread_pool_getkey() succeeds, it
+must set the value of *data since the caller may try to use it.
+
+Upstream-Status: pending
+
+Signed-off-by: Joe Slater <jslater@windriver.com>
+
+
+--- a/libraries/libldap_r/thr_stub.c
++++ b/libraries/libldap_r/thr_stub.c
+@@ -217,6 +217,7 @@ ldap_pvt_thread_pool_unidle ( ldap_pvt_t
+ int ldap_pvt_thread_pool_getkey (
+ 	void *ctx, void *key, void **data, ldap_pvt_thread_pool_keyfree_t **kfree )
+ {
++	if (data) *data = NULL;  /* avoid problems with uninitialized *data */
+ 	return(0);
+ }
+ 

meta-oe/recipes-support/openldap/openldap_2.4.39.bb

@@ -25,6 +25,7 @@ SRC_URI = "ftp://ftp.openldap.org/pub/OpenLDAP/openldap-release/${BP}.tgz \
     file://use-urandom.patch \
     file://initscript \
     file://slapd.service \
+    file://thread_stub.patch \
 "
 SRC_URI[md5sum] = "b0d5ee4b252c841dec6b332d679cf943"
 SRC_URI[sha256sum] = "8267c87347103fef56b783b24877c0feda1063d3cb85d070e503d076584bf8a7"