DO_2BITS(asf->packet_flags >> 1, padsize, 0); // sequence ignored
DO_2BITS(asf->packet_flags >> 3, padsize, 0); // padding length
+ //the following checks prevent overflows and infinite loops
+ if(packet_length >= (1U<<29)){
+ av_log(s, AV_LOG_ERROR, "invalid packet_length %d at:%"PRId64"\n", packet_length, url_ftell(pb));
+ return 0; // FIXME this should be -1
+ }
+ if(padsize >= (1U<<29)){
+ av_log(s, AV_LOG_ERROR, "invalid padsize %d at:%"PRId64"\n", padsize, url_ftell(pb));
+ return 0; // FIXME this should be -1
+ }
+
asf->packet_timestamp = get_le32(pb);
get_le16(pb); /* duration */
// rsize has at least 11 bytes which have to be present
//printf("PacketLeftSize:%d Pad:%d Pos:%Ld\n", asf->packet_size_left, asf->packet_padsize, url_ftell(pb));
if((url_ftell(&s->pb) + ret - s->data_offset) % asf->packet_size)
ret += asf->packet_size - ((url_ftell(&s->pb) + ret - s->data_offset) % asf->packet_size);
+ assert(ret>=0);
/* fail safe */
url_fskip(pb, ret);
asf->packet_pos= url_ftell(&s->pb);