rdpdr_send_completion(uint32 device, uint32 id, uint32 status, uint32 result, uint8 * buffer,
		      uint32 length)
{
	STREAM s;

#ifdef WITH_SCARD
	scard_lock(SCARD_LOCK_RDPDR);
#endif
	s = channel_init(rdpdr_channel, 20 + length);
	out_uint16_le(s, RDPDR_CTYP_CORE);
	out_uint16_le(s, PAKID_CORE_DEVICE_IOCOMPLETION);
	out_uint32_le(s, device);
	out_uint32_le(s, id);
	out_uint32_le(s, status);
	out_uint32_le(s, result);
	out_uint8p(s, buffer, length);
	s_mark_end(s);

	logger(Protocol, Debug, "rdpdr_send_completion()");
	/* hexdump(s->channel_hdr + 8, s->end - s->channel_hdr - 8); */

	channel_send(s, rdpdr_channel);
#ifdef WITH_SCARD
	scard_unlock(SCARD_LOCK_RDPDR);
#endif
}

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.