@@ -87,6 +87,11 @@ static av_cold int iss_read_header(AVFormatContext *s, AVFormatParameters *ap)

     get_token(pb, token, sizeof(token)); //Version ID

     get_token(pb, token, sizeof(token)); //Size

+    if (iss->packet_size <= 0) {

+        av_log(s, AV_LOG_ERROR, "packet_size %d is invalid\n", iss->packet_size);

+        return AVERROR_INVALIDDATA;

+    }

+

     iss->sample_start_pos = avio_tell(pb);

     st = avformat_new_stream(s, NULL);