Original patch: https://trac.xiph.org/attachment/ticket/1347/vorbis-tools-1.2.0-sec.patch
--- vorbis-tools-1.1.1/ogg123/speex_format.c.orig	2008-04-28 16:04:33.000000000 -0400
+++ vorbis-tools-1.1.1/ogg123/speex_format.c	2008-04-28 16:05:20.000000000 -0400
@@ -471,7 +471,7 @@ void *process_header(ogg_packet *op, int
            cb->printf_error(callback_arg, ERROR, _("Cannot read header"));
      return NULL;
    }
-   if ((*header)->mode >= SPEEX_NB_MODES) {
+   if ((*header)->mode >= SPEEX_NB_MODES || (*header)->mode < 0) {
      cb->printf_error(callback_arg, ERROR, 
 		      _("Mode number %d does not (any longer) exist in this version"),
 	      (*header)->mode);