[asterisk-dev] How to find crashing problems (cause maybe double free) in my own module?

[Håkon Nessjøen]

On Fri, May 22, 2009 at 11:09 AM, Holger Wirtz <wirtz at dfn.de> wrote:

> >    1. free() does *NOT* set the ptr to NULL. It just marks the allocated
> >    memory as unused. The ptr will still keep pointing to the same
> address. Its
> >    the programmer's responsibility to ensure that ptr is not used again
> in this
> >    state.
>
> Yes. That's why I think tehere is a problem with a freed pointer that
> isn't set to NULL...
>

So you should set your pointer to NULL after freeing it. This way you will
never free the same pointer twice.
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