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isBadReadPtr problem.

 
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mgr.inz.Player
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PostPosted: Mon Dec 24, 2012 10:26 am    Post subject: isBadReadPtr problem. Reply with quote

OK, I have some problems. Game uses LUA.

this code works:
Code:
lea eax,[ebp+50]
push 04
push eax
call isbadreadptr
cmp eax,0
jne originalcode


But when used two times in row, game crash:
Code:

lea eax,[ebp+50]
push 04
push eax
call isbadreadptr
cmp eax,0
jne originalcode

mov eax,[ebp+50]
push 04
push eax
call isbadreadptr
cmp eax,0
jne originalcode


What's wrong?

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Last edited by mgr.inz.Player on Mon Dec 24, 2012 1:21 pm; edited 1 time in total
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Dark Byte
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Joined: 09 May 2003
Posts: 22654
Location: The netherlands

PostPosted: Mon Dec 24, 2012 11:20 am    Post subject: Reply with quote

perhaps the memory has become unreadable after the call to isbadreadptr ?
Or ebp+10 points to a stack location that isn't allocated yet

also, though I bet it won't make a difference, try push 00000004

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mgr.inz.Player
I post too much
Reputation: 165

Joined: 07 Nov 2008
Posts: 4432
Location: W kraju nad Wisla. UTC+01:00

PostPosted: Mon Dec 24, 2012 2:53 pm    Post subject: Reply with quote

I think I have to step-by-step debug whole script I made for "Don't Starve".

Because, I've tried two isbadreadptr checks in row, in another game Legend of Grimrock v1.1.4 - I made new script from the scratch. And it works as should - no crash.

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