Ethereal-dev: [ethereal-dev] packet-netbios bug

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From: Gilbert Ramirez <gram@xxxxxxxxxx>
Date: Tue, 24 Aug 1999 16:05:52 -0500
I get a segfault when trying to decode this file. I get this stack
trace, but I'm having a very strange debug session. When I go to stack
frame 4, I try to print the values for tree and label and I get 0x0 for both.
But both have non-zero values... look at the function call in the trace below.

Perhaps the function's arguments are getting corrupt in the stack.

Anyway, I wanted to know if others get segfaults with this trace file.
I'm using gcc-2.95 on Linux 2.2.12-pre7, so it could possibly be a bug
with gcc. But I have high hopes that it's an Ethereal problem and not a
compiler bug.

--gilbert

#0  0x402adfea in _IO_vfprintf (s=0xbfffe8e8, format=0x80a8132 "%s: %s (%s)", ap=0xbfffea6c) at vfprintf.c:1248
#1  0x402bad16 in _IO_vsnprintf (string=0x8158140 "Sender's Name:  ( 01", maxlen=240, format=0x80a8132 "%s: %s (%s)", 
    args=0xbfffea60) at vsnprintf.c:129
#2  0x808af97 in proto_tree_add_item_value (tree=0x8146bcc, hfindex=137, start=45, length=16, include_format=1, 
    visible=1, ap=0xbfffea5c) at proto.c:425
#3  0x808ae2d in proto_tree_add_text (tree=0x8146bcc, start=45, length=16) at proto.c:327
#4  0x8074538 in netbios_add_name (label=0x80a82f4 "Sender's Name", pd=0x8147491 ",", offset=17, nb_offset=28, 
    tree=0x8146bcc) at packet-netbios.c:215
#5  0x8074c78 in dissect_netb_datagram (data_ptr=0x8147491 ",", offset=17, fd=0x81544b0, tree=0x8146bcc)
    at packet-netbios.c:511
#6  0x8074f5b in dissect_netbios (pd=0x8147480 "\003", offset=17, fd=0x81544b0, tree=0x8146938)
    at packet-netbios.c:666
#7  0x8071849 in dissect_llc (pd=0x8147480 "\003", offset=14, fd=0x81544b0, tree=0x8146938) at packet-llc.c:301
#8  0x8069172 in dissect_eth (pd=0x8147480 "\003", offset=0, fd=0x81544b0, tree=0x8146938) at packet-eth.c:194
#9  0x8088612 in dissect_packet (pd=0x8147480 "\003", fd=0x81544b0, tree=0x8146938) at packet.c:658
#10 0x8061fbd in add_packet_to_packet_list (fdata=0x81544b0, cf=0x80c9e60, buf=0x8147480 "\003") at file.c:479
#11 0x80623d4 in wtap_dispatch_cb (user=0x80c9e60 "°s\024\b`\177\024\b\fo\004", phdr=0x8147170, offset=12064, 
    buf=0x8147480 "\003") at file.c:635
#12 0x809222f in wtap_loop (wth=0x8147160, count=0, callback=0x80622dc <wtap_dispatch_cb>, 
    user=0x80c9e60 "°s\024\b`\177\024\b\fo\004", err=0xbfffed04) at wtap.c:172
#13 0x8061787 in read_cap_file (cf=0x80c9e60) at file.c:217
#14 0x8061085 in main (argc=4, argv=0xbffffa04) at ethereal.c:1462
#15 0x4027fcb3 in __libc_start_main (main=0x805fd88 <main>, argc=4, argv=0xbffffa04, init=0x80526e0 <_init>, 
    fini=0x8099b04 <_fini>, rtld_fini=0x4000a350 <_dl_fini>, stack_end=0xbffff9fc)
    at ../sysdeps/generic/libc-start.c:78

Attachment: uthscsa.snoop
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