sec_send_to_channel(STREAM s, uint32 flags, uint16 channel)
{
	int datalen;

#ifdef WITH_SCARD
	scard_lock(SCARD_LOCK_SEC);
#endif

	s_pop_layer(s, sec_hdr);
	if ((!g_licence_issued && !g_licence_error_result) || (flags & SEC_ENCRYPT))
		out_uint32_le(s, flags);

	if (flags & SEC_ENCRYPT)
	{
		flags &= ~SEC_ENCRYPT;
		datalen = s->end - s->p - 8;
		sec_sign(s->p, 8, g_sec_sign_key, g_rc4_key_len, s->p + 8, datalen);
		sec_encrypt(s->p + 8, datalen);
	}

	mcs_send_to_channel(s, channel);

#ifdef WITH_SCARD
	scard_unlock(SCARD_LOCK_SEC);
#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.