Fix valgrind and asan memory leaks and crashes.

libavformat/oggdec.c

 /*
  * Ogg bitstream support
  * Luca Barbato <lu_zero@gentoo.org>
  * Based on tcvp implementation
  */
 
 /*
     Copyright (C) 2005  Michael Ahlberg, Måns Rullgård
 
     Permission is hereby granted, free of charge, to any person
@@ skipping 611 matching lines @@
 
     return psize;
 }
 
 static int ogg_read_close(AVFormatContext *s)
 {
     struct ogg *ogg = s->priv_data;
     int i;
 
     for (i = 0; i < ogg->nstreams; i++){
-        av_free (ogg->streams[i].buf);
-        av_free (ogg->streams[i].private);
+        struct ogg_stream os = ogg->streams[i];
+        struct oggvorbis_private *priv = os.private;
+        if (priv && priv->packet && os.buf) {
+            int pkt_type = os.buf[os.pstart];
+            if (pkt_type & 1 && pkt_type <= 5)
+               av_freep (&priv->packet[pkt_type >> 1]);
+        }
+        av_free (os.buf);
+        av_free (os.private);
     }
     av_free (ogg->streams);
     return 0;
 }
 
 static int64_t ogg_read_timestamp(AVFormatContext *s, int stream_index,
                                   int64_t *pos_arg, int64_t pos_limit)
 {
     struct ogg *ogg = s->priv_data;
     AVIOContext *bc = s->pb;
@@ skipping 92 matching lines @@
     .priv_data_size = sizeof(struct ogg),
     .read_probe     = ogg_probe,
     .read_header    = ogg_read_header,
     .read_packet    = ogg_read_packet,
     .read_close     = ogg_read_close,
     .read_seek      = ogg_read_seek,
     .read_timestamp = ogg_read_timestamp,
     .extensions     = "ogg",
     .flags          = AVFMT_GENERIC_INDEX,
 };