Wireshark · Ethereal-dev: Re: [Ethereal-dev] Access violation in v0.10.6 (reproducible in decode_as_dlg.c)

[Guy Harris <gharris@xxxxxxxxx>]

peter@xxxxxxxxxxxx wrote:

> To reproduce the error (access violation on Windows, segmentation fault on
> Unix) do:
> 1. Start a capture, any network data is feasible.
> 2. Stop the capture (after a while, make sure you have at least one packet
> to "decode as").
> 3. Choose "Analyse -> Decode as" and choose any protocol other than the
> one it actually is when captured.
> 4. Let's say you choose ftp as the protocol to decode the captured stream
> as. Now add ftp (only ftp) as filter, this shows of course only the
> "Decode as" packets.
> 5. Choose "Analyse -> Decode as -> default". This causes the access
> violation in gtk\decode_as_dlg.c, routine static void
> decode_transport(GtkWidget *notebook_pg). The first call to
> "decode_change_one_dissector(table_name, cfile.edt->pi.srcport, list);"
> fails since cfile.edt in this case is NULL.

I tried that but couldn't reproduce the problem.

"cfile.edt" should be non-null if a packet is selected, and if no packet 
is selected, the "Analyze -> Decode As" menu item should be disabled.