Fix race condition in sdap code

Retrieving ldap results and storing users could sometimes results in race
conditions where the final ldap result was retrieved before the store operations
where finished resulting in the operations to be aborted before termination.
Implement a serialization mechanism per operation.

1 files changed, 9 insertions, 1 deletions

diff --git a/server/providers/ldap/sdap.h b/server/providers/ldap/sdap.h
index 8466473e3..5afbcfc05 100644
--- a/server/providers/ldap/sdap.h
+++ b/server/providers/ldap/sdap.h
@@ -24,10 +24,14 @@
 #include <ldap.h>
 
 struct sdap_msg {
+    struct sdap_msg *next;
     LDAPMessage *msg;
 };
 
-typedef void (sdap_op_callback_t)(void *, int, struct sdap_msg *);
+struct sdap_op;
+
+typedef void (sdap_op_callback_t)(struct sdap_op *op,
+                                  struct sdap_msg *, int, void *);
 
 struct sdap_handle;
 
@@ -40,6 +44,10 @@ struct sdap_op {
 
     sdap_op_callback_t *callback;
     void *data;
+
+    struct tevent_context *ev;
+    struct sdap_msg *list;
+    struct sdap_msg *last;
 };
 
 struct sdap_handle {