Index: apps/buffering.c
===================================================================
--- apps/buffering.c	(revision 20328)
+++ apps/buffering.c	(working copy)
@@ -702,7 +702,7 @@
     {
         LOGFQUEUE("buffering >| Q_BUFFER_HANDLE %d", handle_id);
         queue_send(&buffering_queue, Q_BUFFER_HANDLE, handle_id);
-        h->ridx = h->data + newpos;
+        h->ridx = RINGBUF_ADD(h->data, newpos - h->offset);
         return;
     }