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Check if pointer points

 
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Gi@nnis
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PostPosted: Fri Aug 08, 2014 4:33 pm    Post subject: Check if pointer points Reply with quote
How do I verify that a pointer point somewhere?

Lets say that I expect at [esi+18] to be a pointer. But for some reason 1/1000 times there isn't one.
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Dark Byte
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PostPosted: Fri Aug 08, 2014 4:48 pm    Post subject: Reply with quote
usually check if it's NULL (0)
Code:

cmp [esi+18],0
je nopointer


but if it can be random garbage then you're out of luck. You could write a complicated call to virtualquery to get the protection of that address, but it's kinda slow if it's called a lot, and it's not an easy to setup function to call
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Gi@nnis
Cheater
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Joined: 26 Oct 2013
Posts: 32
Location: Greece
PostPosted: Sat Aug 09, 2014 9:52 am    Post subject: Reply with quote
Dark Byte wrote:
usually check if it's NULL (0)
Code:

cmp [esi+18],0
je nopointer


but if it can be random garbage then you're out of luck. You could write a complicated call to virtualquery to get the protection of that address, but it's kinda slow if it's called a lot, and it's not an easy to setup function to call


Yeah that's what I though. I wanted someone with more experience to verify it, because testing result as not as reliable (might work now but not work later).

As far as I can test it, it works fine.

Thanks! As always, very helpful. Smile
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