Dereferenced non-allocated pointer error

[adam-mcdaniel]

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To make programs more correct, runtime checks could be added for determining whether or not the program is accessing memory it does not own.

To be a valid pointer, it must either:

1. Point to an address that is less than the stack pointer. Pointers to stack variables are valid pointers.
2. Point to allocated memory on the heap. Non-allocated memory on the heap should not be accessed.

Dereferencing an address that violates either of those rules could throw a accessed unowned memory error.

[kevinramharak]

Does this mean that every dereference of a pointer has to be checked? I'm assuming performance is not really a concern right now, but does this not generate a lot of overhead?