shutdown: закрывать shared sqlite (topo_sqlite_db) в самом конце utun_instance_destroy (UAF при teardown)

src/utun_instance.c

@@ -614,6 +614,14 @@ void utun_instance_destroy(struct UTUN_INSTANCE *instance) {
         instance->nodeinfo_cbks = r->next; u_free(r);
     }
 
+    // Shared SQLite DB закрываем в самом конце: routing/chat/media/db_sync
+    // используют его во время всего teardown (см. topo_groups_destroy).
+    if (instance->topo_sqlite_db) {
+        sqlite3_close(instance->topo_sqlite_db);
+        instance->topo_sqlite_db = NULL;
+        DEBUG_INFO(DEBUG_CATEGORY_SYS, "[INSTANCE_DESTROY] shared sqlite closed");
+    }
+
     u_free(instance);
     DEBUG_INFO(DEBUG_CATEGORY_SYS, "[INSTANCE_DESTROY] Instance destroyed completely");
 }