MASM Dereference pointer Twice? - pointers

Question

Straight and to the point I am stuck at a piece of my code. Within checkdigit proc I am trying to move the value that are at the corresponding memory locations into registers and using the [] to dereference the pointers. However, looking through this I am assuming you can not dereference a pointer twice, as I have pushed the addresses of these 'varaibles' on to the stack to use, and I guess creating another pointer. The current code will pass the memory locations of the values that I want to pass to the registers, however I am unable to dereference the memory location to get to my values. Any help would be appreciated even if it means I will not be able to use the current code. Thank you.
;valid pin program
include c:/Irvine/Irvine32.inc
NULL EQU 0
CR EQU 0dh
LF EQU 0ah
nextdigit EQU 4
range EQU 8[ebp]
digit EQU 12[ebp]
.data
outfile byte "resultpin.txt", NULL
infile byte "Pin.txt", NULL
input dword ?
output dword ?
buffer_size = 130
buffer byte buffer_size dup (?), NULL
bytesread dword ?
buffpos dword 0
pinpos dword 1
digitnum dword 0
range1 dword '4', '8', NULL
range2 dword '2', '5', NULL
range3 dword '5', '9', NULL
range4 dword '1', '4', NULL
range5 dword '3', '6', NULL
rangeray dword range1, range2, range3, range4, range5, NULL
rangepos dword 12
;memory offset is 60
equal byte "=", NULL
great byte "PIN is valid", NULL
fault1 byte "/Digit position ", NULL
fault2 byte "is invalid/", NULL
faultray dword fault1, fault2, NULL
;memory offset is 29
faultpos dword 17
gap byte LF, CR, NULL
.code
main proc
lea edx, outfile ;create & open output file
call CreateOutputFile
mov output, eax
lea esi,infile ;open input file linkage
call openfiles
lea esi,buffer
mov ecx,digitnum
call countdigits
call resetregs
lea esi,buffer
lea edi,rangeray
add edi,-60 ;start at beginning of rangeray
mov ecx,digitnum
L1:
push esi
push edi
push ebp
call checkdigit
pop ebp
pop edi
pop esi
loop L1
main endp
openfiles proc
lea edx,[esi] ;open file
call OpenInputFile
mov input, eax
mov eax, input ;read input
file
lea edx, buffer
mov ecx, buffer_size
call ReadFromFile
mov bytesRead, eax
ret
openfiles endp
countdigits proc
nextnumber:
mov dl,[esi] ;if not a
number bypass inc ecx
cmp dl,'0'
jl notdigit
cmp dl,'9'
jg notdigit
inc ecx
notdigit:
inc esi
mov dl,[esi]
cmp dl,NULL ;if esi
is NULL then return out of proc
jne nextnumber
mov digitnum,ecx
ret
countdigits endp
checkdigit proc
mov ebp,esp
mov ebx,digit
mov edx,range
cmp ebx,edx
jl notvalid
mov ebx,0
notvalid:
ret
checkdigit endp
resetregs proc
mov eax,0 ;reset
following registers
mov ebx,0
mov ecx,0
mov edx,0
mov dl,0
mov al,0
ret
resetregs endp
end main