[Jeff Foster <jfoste@xxxxxxxxxxxx>]

As the developer of the ethereal socks dissector I'm a little confused
by the line that cause the segfault. Can I have the pcap dumpfile that
caused the problem, so I can attempt to correct the problem.

Jeff Foster
jfoste@xxxxxxxxxxxx


-----Original Message-----
From: Frederic Peters [mailto:fpeters@xxxxxxxx]
Sent: Sunday, January 07, 2001 3:41 PM
To: ethereal-dev@xxxxxxxxxxxx
Cc: 81164-forwarded@xxxxxxxxxxxxxxx; Peter Gervai
Subject: [Ethereal-dev] [grin@xxxxxxxxxxxxxxx: Bug#81164: ethereal:
segfault analysing a tcpdump file (dissect_socks)]


Hello,

Reported as bug to the Debian bts.

Regards,
	Frederic

----- Forwarded message from Peter Gervai <grin@xxxxxxxxxxxxxxx> -----

Date: Thu, 04 Jan 2001 01:04:38 +0100
From: Peter Gervai <grin@xxxxxxxxxxxxxxx>
Subject: Bug#81164: ethereal: segfault analysing a tcpdump file
(dissect_socks)
To: submit@xxxxxxxxxxxxxxx
X-Mailer: bug 3.3.7

Package: ethereal
Version: 0.8.14-1
Severity: normal

Sig11 on a pcap dumpfile.

#0  dissect_socks (pd=0x838d710 "", offset=54, fd=0x84100e0, tree=0x0) at
packet-socks.c:991
991                     if (( hash_info->version == 4) || (
hash_info->version == 5)){
(gdb) bt
#0  dissect_socks (pd=0x838d710 "", offset=54, fd=0x84100e0, tree=0x0) at
packet-socks.c:991
#1  0x814fbb5 in dissector_try_port (sub_dissectors=0x82b04c0, port=1080,
tvb=0x834bb88, pinfo=0x82aba60, tree=0x0) at packet.c:1303
#2  0x80f813f in decode_tcp_ports (tvb=0x834bb58, offset=20,
pinfo=0x82aba60, tree=0x0, src_port=1080, dst_port=25) at packet-tcp.c:417
#3  0x80f8886 in dissect_tcp (tvb=0x834bb58, pinfo=0x82aba60, tree=0x0) at
packet-tcp.c:590
#4  0x814fbc8 in dissector_try_port (sub_dissectors=0x82ad948, port=6,
tvb=0x834bb58, pinfo=0x82aba60, tree=0x0) at packet.c:1306
#5  0x80a89be in dissect_ip (tvb=0x834bb28, pinfo=0x82aba60, tree=0x0) at
packet-ip.c:956
#6  0x814fbc8 in dissector_try_port (sub_dissectors=0x82ad7e8, port=2048,
tvb=0x834bb28, pinfo=0x82aba60, tree=0x0) at packet.c:1306
#7  0x809d1f9 in ethertype (etype=2048, tvb=0x834baf8,
offset_after_etype=14, pinfo=0x82aba60, tree=0x0, fh_tree=0x814e19b,
item_id=377) at packet-ethertype.c:114
#8  0x809cfd9 in dissect_eth (tvb=0x834baf8, pinfo=0x82aba60, tree=0x0) at
packet-eth.c:306
#9  0x809dae8 in dissect_frame (tvb=0x834baf8, pinfo=0x82aba60, tree=0x0) at
packet-frame.c:135
#10 0x814f791 in dissect_packet (p_tvb=0x848f990, pseudo_header=0x834bf54,
pd=0x838d710 "", fd=0x84100e0, tree=0x0) at packet.c:1041
#11 0x814dd02 in epan_dissect_new (pseudo_header=0x834bf54, data=0x838d710
"", fd=0x84100e0, tree=0x0) at epan.c:90
#12 0x811684b in add_packet_to_packet_list (fdata=0x84100e0, cf=0x829b7c0,
pseudo_header=0x834bf54, buf=0x838d710 "", refilter=1) at file.c:646
#13 0x8116c0a in read_packet (cf=0x829b7c0, offset=1325504) at file.c:805
#14 0x811619f in read_cap_file (cf=0x829b7c0, err=0xbfffed84) at file.c:356
#15 0x8145cda in file_open_ok_cb (w=0x8343628, fs=0x82ffd80) at
file_dlg.c:191
#16 0x1dc8d1 in gtk_marshal_NONE__NONE () from /usr/lib/libgtk-1.2.so.0
#17 0x20b06c in gtk_signal_remove_emission_hook () from
/usr/lib/libgtk-1.2.so.0
#18 0x20a4d5 in gtk_signal_set_funcs () from /usr/lib/libgtk-1.2.so.0
#19 0x2085b3 in gtk_signal_emit () from /usr/lib/libgtk-1.2.so.0
#20 0x17abe8 in gtk_button_clicked () from /usr/lib/libgtk-1.2.so.0
#21 0x17c20d in gtk_button_get_relief () from /usr/lib/libgtk-1.2.so.0
#22 0x1dc8d1 in gtk_marshal_NONE__NONE () from /usr/lib/libgtk-1.2.so.0
#23 0x20a36f in gtk_signal_set_funcs () from /usr/lib/libgtk-1.2.so.0
#24 0x2085b3 in gtk_signal_emit () from /usr/lib/libgtk-1.2.so.0
#25 0x17ab28 in gtk_button_released () from /usr/lib/libgtk-1.2.so.0
#26 0x17bb78 in gtk_button_get_relief () from /usr/lib/libgtk-1.2.so.0
#27 0x1dc55b in gtk_marshal_BOOL__POINTER () from /usr/lib/libgtk-1.2.so.0
#28 0x20a513 in gtk_signal_set_funcs () from /usr/lib/libgtk-1.2.so.0
#29 0x2085b3 in gtk_signal_emit () from /usr/lib/libgtk-1.2.so.0
#30 0x23e96b in gtk_widget_event () from /usr/lib/libgtk-1.2.so.0
#31 0x1dc4c5 in gtk_propagate_event () from /usr/lib/libgtk-1.2.so.0
#32 0x1db6ee in gtk_main_do_event () from /usr/lib/libgtk-1.2.so.0
#33 0x288067 in gdk_wm_protocols_filter () from /usr/lib/libgdk-1.2.so.0
#34 0x2b82d9 in g_get_current_time () from /usr/lib/libglib-1.2.so.0
#35 0x2b88e3 in g_get_current_time () from /usr/lib/libglib-1.2.so.0
#36 0x2b8a7c in g_main_run () from /usr/lib/libglib-1.2.so.0
#37 0x1dafe7 in gtk_main () from /usr/lib/libgtk-1.2.so.0
#38 0x8135062 in main (argc=1, argv=0xbffffc44) at main.c:1370
#39 0x32be6c in __libc_start_main () from /lib/libc.so.6

(gdb) p conversation
$6 = (conversation_t *) 0x1
(gdb) p hash_info
$7 = (socks_hash_entry_t *) 0x0


969                             /* new conversation create local data
structure */
970             else {
971                     hash_info = g_mem_chunk_alloc(socks_vals);
972                     hash_info->start_done_row = G_MAXINT;
973                     hash_info->state = None;
974                     hash_info->port = -1;

...

986
987             if (check_col(fd, COL_PROTOCOL))
988                     col_set_str(fd, COL_PROTOCOL, "Socks");
989
990             if (check_col(fd, COL_INFO)){
991                     if (( hash_info->version == 4) || (
hash_info->version == 5)){
992                             col_add_fstr(fd, COL_INFO, "Version: %d",
993                                     hash_info->version);
994                     }
995                     else                    /* unknown version display
error */


Maybe someone forgot to check whether g_mem_chunk_alloc returned allocation
failure?


(Just FYI the pcap listed by tcpdump:
15:41:13.492366  ip 62: a.example.com.1068 > b.example.com.smtp: S
17400728:17400728(0) win 8192 <mss 1460,nop,nop,sackOK> (DF)
15:41:13.493017  ip 62: b.example.com.smtp > a.example.com.1068: S
3218871106:3218871106(0) ack 17400729 win 32120 <mss 1460,nop,nop,sackOK>
15:41:13.497155  ip 60: a.example.com.1068 > b.example.com.smtp: . ack 1 win
8760 (DF)
15:41:15.113379  ip 128: b.example.com.smtp > a.example.com.1068: P 1:75(74)
ack 1 win 32120
15:41:15.121608  ip 69: a.example.com.1068 > b.example.com.smtp: P 1:16(15)
ack 75 win 8686 (DF)
  ^^^ segfaults here somewhere
15:41:15.122263  ip 54: b.example.com.smtp > a.example.com.1068: . ack 16
win 32120

and it simply isn't socks, maybe that's why the socks analyzer dies on it.)


-- System Information
Debian Release: woody
Kernel Version: Linux Yikes 2.2.17 #5 Wed Oct 11 13:56:51 CEST 2000 i686
unknown

Versions of the packages ethereal depends on:
ii  libc6          2.2-6          GNU C Library: Shared libraries and
Timezone
ii  libglib1.2     1.2.8-1        The GLib library of C routines
ii  libgtk1.2      1.2.8-2        The GIMP Toolkit set of widgets for X
ii  libpcap0       0.5.2-2        System interface for user-level packet
captu
ii  xlibs          4.0.2-1        X Window System client libraries
ii  zlib1g         1.1.3-11       compression library - runtime



----- End forwarded message -----

-- 
Frederic Peters <fpeters@xxxxxxxx>        � Le travail a �t� ce que l'homme
Debian GNU/Linux : http://www.debian.org     a trouv� de mieux pour ne rien
Gaby : http://gaby.netpedia.net              faire de sa vie. �  R. Vaneigem

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