https://bugs.wireshark.org/bugzilla/show_bug.cgi?id=6416
--- Comment #23 from Jeff Morriss <jeff.morriss.ws@xxxxxxxxx> 2011-10-27 18:16:08 PDT ---
(In reply to comment #20)
> (In reply to comment #15)
> > A couple other comments:
> > 1) Shouldn't the tvb_length_remaining() calls be
> > tvb_reported_length_remaining()? At least the ones checking for how much data
> > is left before raising an expert info--since having a capture cut short by a
> > snaplen is does not a malformed packet make (it makes a truncated packet).
> > Another related question is whether those checks are really necessary: if they
> > weren't there the dissector would walk off the end of the TVB and throw the
> > appropriate exception.
>
> I can make the changes for tvb_reported_length_remaining(), but the issue I've
> run into is that when the exception is thrown some already dissected fields
> were "discarded", I think to the top of the subtree where the item that walked
> off the end was being added to. Since this dissector used to have a larger
> amount of proto_tree_add_texts instead of proto_tree_add_items perhaps that was
> the real reason fields were being discarded, but I was trying to prevent those
> cases again.
That's... Really weird. I can't imagine how anything added to the tree would
be "unrolled" due to an exception.
> > 2) Double check the encoding values. For example hf_cip_link_address_string is
> > used with ENC_LITTLE_ENDIAN; that should probably be ENC_ASCII|ENC_NA.
>
> I'm going to chalk this one up to the patch not applying cleanly because my
> code (and the patch from what I can see) has hf_cip_link_address_string with a
> ENC_ASCII|ENC_NA encoding.
Oh boy.. Looks like I was reviewing attachment 7223 which was the one prior to
the fix-encoding-args one. <sigh> I don't know how that happened (especially
since bugzilla normally hides obsolete attachments). Sorry about that...
BTW, we've been having a rash of fuzz failures from the CIP dissector recently.
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