static int ttusbdecfe_dvbt_read_status(struct dvb_frontend *fe,
	fe_status_t *status)
{
	struct ttusbdecfe_state* state = fe->demodulator_priv;
	u8 b[] = { 0x00, 0x00, 0x00, 0x00,
		   0x00, 0x00, 0x00, 0x00 };
	u8 result[4];
	int len, ret;

	*status=0;

	ret=state->config->send_command(fe, 0x73, sizeof(b), b, &len, result);
	if(ret)
		return ret;

	if(len != 4) {
		printk(KERN_ERR "%s: unexpected reply\n", __func__);
		return -EIO;
	}

	switch(result[3]) {
		case 1:  /* not tuned yet */
		case 2:  /* no signal/no lock*/
			break;
		case 3:	 /* signal found and locked*/
			*status = FE_HAS_SIGNAL | FE_HAS_VITERBI |
			FE_HAS_SYNC | FE_HAS_CARRIER | FE_HAS_LOCK;
			break;
		case 4:
			*status = FE_TIMEDOUT;
			break;
		default:
			pr_info("%s: returned unknown value: %d\n",
				__func__, result[3]);
			return -EIO;
	}

	return 0;
}

The product performs operations on a memory buffer, but it reads from or writes to a memory location outside the buffer's intended boundary. This may result in read or write operations on unexpected memory locations that could be linked to other variables, data structures, or internal program data.