netdev - Re: [PATCH net-next V5 6/6] icmp: add response to RFC 8335 PROBE messages

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Message-ID: <065c20b62c479ecd2a9d3bb7bf36de1ac8390a55.camel@gmail.com>
Date:   Mon, 29 Mar 2021 13:33:39 -0500
From:   Andreas Roeseler <andreas.a.roeseler@...il.com>
To:     Willem de Bruijn <willemdebruijn.kernel@...il.com>
Cc:     Network Development <netdev@...r.kernel.org>,
        David Miller <davem@...emloft.net>,
        Hideaki YOSHIFUJI <yoshfuji@...ux-ipv6.org>,
        David Ahern <dsahern@...nel.org>,
        Jakub Kicinski <kuba@...nel.org>
Subject: Re: [PATCH net-next V5 6/6] icmp: add response to RFC 8335 PROBE
 messages

On Sun, 2021-03-28 at 13:00 -0400, Willem de Bruijn wrote:
> On Wed, Mar 24, 2021 at 2:20 PM Andreas Roeseler
> <andreas.a.roeseler@...il.com> wrote:
> > 
> 
> > +       if (!ext_hdr || !iio)
> > +               goto send_mal_query;
> > +       if (ntohs(iio->extobj_hdr.length) <= sizeof(iio-
> > >extobj_hdr))
> > +               goto send_mal_query;
> > +       ident_len = ntohs(iio->extobj_hdr.length) - sizeof(iio-
> > >extobj_hdr);
> 
> As asked in v3: this can have negative overflow?

The line above checks that iio->extobj_hdr.length is greater than the
size of iio->extobj_hdr.