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how to check validity of a pointer in AA?

 
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Freiza
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Joined: 28 Jun 2010
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PostPosted: Tue Mar 22, 2011 1:44 pm    Post subject: how to check validity of a pointer in AA? Reply with quote
how to check .. if a pointer is valid or not..

like

Code:
mov eax,[ebx] // suppose [ebx] contains a pointer
or eax,eax
je here

.............
.........
here:


the above code checks that eax is 0 or not..
But how to check for a pointer that is ?? (i mean non existent. not even zero.. structure not existent)..
Is there any NULL keyword in AA
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Innovation
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PostPosted: Tue Mar 22, 2011 4:31 pm    Post subject: Reply with quote
Use IsBadReadPtr. If you don't want to make use of the Windows API, you could set-up your own exception handler and try reading the memory at the address.
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Freiza
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PostPosted: Wed Mar 23, 2011 2:25 am    Post subject: Reply with quote
Thank you
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