Ticket #47824 - paged results control is not working in some cases when we have a subsuffix.

Bug Description: When a simple paged result search is run against
multiple backends, subsuffix backends were not correctly set to the
next loop when crossing the backend boundary.

Fix Description: This patch changes the logic to detect the page
search finished and set the next backend correctly to the paged-
results handle.  Also, when reusing the paged result handle in
pagedresults_parse_control_value, increment the refcnt.

https://fedorahosted.org/389/ticket/47824

Reviewed by [email protected] (Thank you, Mark!!)

ldap/servers/slapd/opshared.c

@@ -510,7 +510,6 @@ op_shared_search (Slapi_PBlock *pb, int send_result)
     err_code = slapi_mapping_tree_select_all(pb, be_list, referral_list, errorbuf);
     if (((err_code != LDAP_SUCCESS) && (err_code != LDAP_OPERATIONS_ERROR) && (err_code != LDAP_REFERRAL))
       || ((err_code == LDAP_OPERATIONS_ERROR) && (be_list[0] == NULL)))
-    
     {
       send_ldap_result(pb, err_code, NULL, errorbuf, 0, NULL);
       rc = -1;
@@ -713,10 +712,6 @@ op_shared_search (Slapi_PBlock *pb, int send_result)
           curr_search_count = -1;
         } else {
           curr_search_count = pnentries;
-          /* no more entries, but at least another backend */
-          if (pagedresults_set_current_be(pb->pb_conn, next_be, pr_idx) < 0) {
-              goto free_and_return;
-          }
         }
         estimate = 0;
       } else {
@@ -731,12 +726,20 @@ op_shared_search (Slapi_PBlock *pb, int send_result)
       pagedresults_set_search_result_set_size_estimate(pb->pb_conn, 
                                                        operation,
                                                        estimate, pr_idx);
-      next_be = NULL; /* to break the loop */
-      if (curr_search_count == -1) {
+      if (PAGEDRESULTS_SEARCH_END == pr_stat) {
         pagedresults_lock(pb->pb_conn, pr_idx);
         slapi_pblock_set(pb, SLAPI_SEARCH_RESULT_SET, NULL);
         pagedresults_free_one(pb->pb_conn, operation, pr_idx);
         pagedresults_unlock(pb->pb_conn, pr_idx);
+        if (next_be) {
+          /* no more entries, but at least another backend */
+          if (pagedresults_set_current_be(pb->pb_conn, next_be, pr_idx) < 0) {
+              goto free_and_return;
+          }
+        }
+        next_be = NULL; /* to break the loop */
+      } else if (PAGEDRESULTS_PAGE_END == pr_stat) {
+        next_be = NULL; /* to break the loop */
       }
     } else {
       /* be_suffix null means that we are searching the default backend

ldap/servers/slapd/pagedresults.c

@@ -136,6 +136,7 @@ pagedresults_parse_control_value( Slapi_PBlock *pb,
         }
         conn->c_pagedresults.prl_count++;
     } else {
+        PagedResults *prp = NULL;
         /* Repeated paged results request.
          * PagedResults is already allocated. */
         char *ptr = slapi_ch_malloc(cookie.bv_len + 1);
@@ -143,6 +144,10 @@ pagedresults_parse_control_value( Slapi_PBlock *pb,
         *(ptr+cookie.bv_len) = '\0';
         *index = strtol(ptr, NULL, 10);
         slapi_ch_free_string(&ptr);
+        prp = conn->c_pagedresults.prl_list + *index;
+        if (!(prp->pr_search_result_set)) { /* freed and reused for the next backend. */
+            conn->c_pagedresults.prl_count++;
+        }
     }
     /* reset sizelimit */
     op->o_pagedresults_sizelimit = -1;