Bugtraq: Re: tcpdump workaround against dnsloop exploit.

[davids () WEBMASTER COM (David Schwartz)]

        This won't work. It stops an A->A->A loop but allows an A->B->A->B loop.
What you want is something more like:

> +                               /*
> +                                * If we got two time the same data ptr,
> +                                * or are being referred forward,
> +                                * this means we may loop.
> +                                */
> +                               if ( cp >= old)
> +                                       return NULL;
> +                               old = cp;
        DS