is that correct?

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zxcv
Guest

zxcv

im litle tired, and i just want to be sure. I never did it before:

Code:

push 512
call [malloc]
mov [wsadata], eax
add eax, 400
mov [buffer], eax ;buffer has space for 112 bytes
push MEM
call [free]
add esp, 8
retn

...

Code:

MEM:
wsadata dd ?
buffer dd ?

is that correct? or i forgot about something?

13 Jan 2008, 18:50

LocoDelAssembly
Your code has a bug

Joined: 06 May 2005
Posts: 4633
Location: Argentina

LocoDelAssembly

No it is not, you are freeing "MEM" address which was never allocated by malloc but by program loader. Since you store the address returned by malloc at [wsadata], you should do "push [wsadata]/call [free]" instead.

13 Jan 2008, 19:09

zxcv
Guest

zxcv

yes, ur right. i always used stack for it, but sometimes it went too complicated and i had to write from beggining Smile

8 bytes in almost empty section isnt much.

13 Jan 2008, 21:00

f0dder

Joined: 19 Feb 2004
Posts: 3170
Location: Denmark

f0dder

Why do you use hardcoded magic values instead of sizeof?

13 Jan 2008, 21:35

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