Ethereal-dev: [Ethereal-dev] Re: [Ethereal-bugs] [Bug 298] New: WSP: dissector assert on priva

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From: "Olivier Biot (Ethereal)" <ethereal@xxxxxxxxxxxxxxx>
Date: Tue, 27 Sep 2005 02:15:37 +0200
Hi folks,
This bug is related to calling proto_item_append_string() which does a progressive update of a FT_STRING or FT_STRINGZ field.
I have been looking at it for the past 6 hours, and have come to the conclusion that a header field can get "promoted" to FT_PROTOCOL (FTENUM = 1), as can be seen from a private debug trace I generated with a patched proto.c and packet-wsp.c (see below).
Is it possible that the TRY_TO_FAKE_THIS_ITEM speed optimization is causing this?
If so, how can this be fixed? Do I have to manually set the visibility of all these incrementally updateable fields to "always visible", or is there another trick? 

Best regards,

Olivier



COMMON ERROR MESSAGE:
BEGIN
** (tethereal.exe): WARNING **: Dissector bug, protocol WSP, in packet [[[pinfo->fd->num]]]: proto.c:1580: failed assertion "hfinfo->type == FT_STRING || hfinfo->type == FT_STRINGZ" proto_item_append_string() - test: [! Error]: field "wsp" has type == FT_PROTOCOL}} 
END
Occurs at the following packets (positions relative to my patched packet-wsp.c, hence a minimal context).
WSP: Packet 117 packet-wsp.c:5698: proto_item_append_string(ti, " (confirmed push facility)"); WSP: Packet 139 packet-wsp.c:5698: proto_item_append_string(ti, " (confirmed push facility)"); WSP: Packet 174 packet-wsp.c:5698: proto_item_append_string(ti, " (confirmed push facility)"); WSP: Packet 194 packet-wsp.c:4466: proto_item_append_string (ti, s); [in parameter_value_q()] WSP: Packet 210 packet-wsp.c:5698: proto_item_append_string(ti, " (confirmed push facility)"); WSP: Packet 229 packet-wsp.c:5698: proto_item_append_string(ti, " (confirmed push facility)"); WSP: Packet 262 packet-wsp.c:5698: proto_item_append_string(ti, " (confirmed push facility)"); WSP: Packet 290 packet-wsp.c:5698: proto_item_append_string(ti, " (confirmed push facility)"); WSP: Packet 293 packet-wsp.c:4142: proto_item_append_string(ti, s); [1st in parameter()] WSP: Packet 314 packet-wsp.c:4466: proto_item_append_string (ti, s); [in parameter_value_q()] WSP: Packet 343 packet-wsp.c:5698: proto_item_append_string(ti, " (confirmed push facility)"); WSP: Packet 347 packet-wsp.c:4142: proto_item_append_string(ti, s); [1st in parameter()] WSP: Packet 397 packet-wsp.c:5698: proto_item_append_string(ti, " (confirmed push facility)"); WSP: Packet 462 packet-wsp.c:5698: proto_item_append_string(ti, " (confirmed push facility)"); WSP: Packet 502 packet-wsp.c:5698: proto_item_append_string(ti, " (confirmed push facility)"); WSP: Packet 514 packet-wsp.c:5700: proto_item_append_string(ti, " (push facility)"); WSP: Packet 528 packet-wsp.c:5698: proto_item_append_string(ti, " (confirmed push facility)"); WSP: Packet 557 packet-wsp.c:5698: proto_item_append_string(ti, " (confirmed push facility)"); WSP: Packet 562 packet-wsp.c:4157: proto_item_append_string(ti, s); [2nd in parameter()] WSP: Packet 585 packet-wsp.c:5698: proto_item_append_string(ti, " (confirmed push facility)"); WSP: Packet 627 packet-wsp.c:5698: proto_item_append_string(ti, " (confirmed push facility)"); WSP: Packet 676 packet-wsp.c:5698: proto_item_append_string(ti, " (confirmed push facility)");
----- Original Message ----- From: <bugzilla-do-not-reply@xxxxxxxxxxxx> 
To: <ethereal-bugs@xxxxxxxxxxxx>
Sent: Monday, July 25, 2005 6:08 PM
Subject: [Ethereal-bugs] [Bug 298] New: WSP: dissector assert on privatelyfuzzed capture 



http://bugs.ethereal.com/bugzilla/show_bug.cgi?id=298

          Summary: WSP: dissector assert on privately fuzzed capture
          Product: Ethereal
          Version: SVN
         Platform: PC
       OS/Version: Windows XP
           Status: NEW
         Severity: Normal
         Priority: Medium
        Component: Ethereal
       AssignedTo: ethereal-bugs@xxxxxxxxxxxx
       ReportedBy: ulf.lamping@xxxxxx


Build information:
Version 0.10.12.028 (SVN 20050724220114)
--
Ethereal raises a dissector assert when opening the attached privately fuzzed 
WSP capture file.

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