CDRIVER-4774 fix data race in mongoc_cursor_get_host (#1468)

Author: kevinAlbs

NEWS

@@ -1,6 +1,13 @@
-libmongoc 1.25.1 (Unreleased)
+libmongoc 1.25.2 (Unreleased)
 =============================
 
+Fixes:
+
+  * Fix data race in `mongoc_cursor_get_host`.
+
+libmongoc 1.25.1
+================
+
 Fixes:
 
   * Add back support for `BUILD_VERSION` CMake option. `BUILD_VERSION` was unintentionally removed in 1.25.0.

src/libbson/NEWS

@@ -1,3 +1,8 @@
+libbson 1.25.2 (Unreleased)
+===========================
+
+TODO: Add news.
+
 libbson 1.25.1
 ==============
 

src/libmongoc/src/mongoc/mongoc-cursor.c

@@ -1370,12 +1370,10 @@ mongoc_cursor_get_host (mongoc_cursor_t *cursor, mongoc_host_list_t *host)
    td = mc_tpld_take_ref (cursor->client->topology);
    description = mongoc_topology_description_server_by_id_const (
       td.ptr, cursor->server_id, &cursor->error);
-   mc_tpld_drop_ref (&td);
-   if (!description) {
-      return;
+   if (description) {
+      *host = description->host;
    }
-
-   *host = description->host;
+   mc_tpld_drop_ref (&td);
 
    EXIT;
 }