Nmap Development: Re: nmap 3.3+V-2.99

[Brett Hutley <brett () hutley net>]

Gisle Vanem wrote:
*snip*
> Here's some patches that works for me:
>
> diff -u3 -H -B -r .\menes-ext\refcount.hpp ..\menes-ext\refcount.hpp
> --- .\menes-ext\refcount.hpp    Sun Aug 31 07:05:09 2003
> +++ ..\menes-ext\refcount.hpp   Sun Aug 31 18:45:41 2003
> @@ -114,7 +114,8 @@
>      typedef Counted_ Value;
>
>      inline void Clear(Value &value) const {
> -        value = NULL;
> +        if (value)
> +                       value = NULL;
>      }
>
> Not sure why, but Clear() is using a NULL-ptr somewhere.
*snip*

Doesn't this break the semantics of passing Value by reference? The 
function call implies that Value should be treated as the object rather 
than a pointer to the object. It would therefore be better to look at 
the callers of this function. I presume someone is doing something like 
this:
Value *value = new Value(); // This call is failing for whatever reason
// value is now NULL.
something.Clear(*value);

So the test should be done *before* calling the Clear function if you 
want to keep the pass by reference semantics.
(Note that I haven't got refcount.hpp in the version of nmap I built, so 
I could be completely off-base here if Counted_ is actually defined to 
be a pointer in the first place).
--
Brett Hutley [MAppFin,CISSP,SANS GCIH]
mailto:brett () hutley net
http://hutley.net/brett



---------------------------------------------------------------------
For help using this (nmap-dev) mailing list, send a blank email to 
nmap-dev-help () insecure org . List run by ezmlm-idx (www.ezmlm.org).