matroskademux: Don't get stuck at the same offset when searching for clusters

This could happen if there is an invalid cluster with size 0, and in that
case just error out instead of looping forever.

diff --git a/gst/matroska/matroska-demux.c b/gst/matroska/matroska-demux.c
index cdecceb..9b2bb0a 100644 (file)
--- a/gst/matroska/matroska-demux.c
+++ b/gst/matroska/matroska-demux.c
@@ -1610,6 +1610,11 @@ gst_matroska_demux_search_cluster (GstMatroskaDemux * demux, gint64 * pos)
         GST_DEBUG_OBJECT (demux, "cluster is first cluster -> OK");
         break;
       }
+      if (newpos == demux->common.offset) {
+        GST_ERROR_OBJECT (demux, "Stuck at the same offset");
+        ret = GST_FLOW_ERROR;
+        goto exit;
+      }
       demux->common.offset = newpos;
       ret = gst_matroska_read_common_peek_id_length_pull (&demux->common,
           GST_ELEMENT_CAST (demux), &id, &length, &needed);