Out-of-bounds pointers

[Doug Gwyn]

In article <240 at bbxsda.UUCP> scott at bbxsda.UUCP (Scott Amspoker) writes:
>Since free() is probably the only possible way for a *valid* pointer to
>suddenly become *invalid* ...

Not at all.  In any block-structured language with pointers,
it is obvious how to have a valid pointer suddenly become invalid.