[Click] IPFragmenter bug (click-1.4.3)

[Alfeiks Kaanoken]

Hi folks,
Some bug is present in the IPFragmenter.
I don't think that it was fixed up in the new release (I was look to the 
``diff'' between new and old version).
So,
I'm was try the following simple configuration
aka tmp $> cat click.lo
FromDevice(lo) -> IPFragmenter(128) -> Print(ok) -> Discard;
and pinging the lo interface when click is running, and get a segfault.
aka tmp $> gdb click
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This GDB was configured as "i486-slackware-linux"...Using host 
libthread_db libr
ary "/lib/libthread_db.so.1".

"/home/kaanoken/works/tmp/click.lo" is not a core dump: File format not 
recogniz
ed
(gdb) run -f click.lo
Starting program: /usr/local/bin/click -f click.lo

Program received signal SIGSEGV, Segmentation fault.
0x08093f7a in IPFragmenter::fragment (this=0x815b7e8, p_in=0x815e368)
   at ../elements/ip/ipfragmenter.cc:102
/home/kaanoken/works/click-1.4.3/elements/ip/ipfragmenter.cc:102:2653:beg:0x8093 

f7a
(gdb) bt
#0  0x08093f7a in IPFragmenter::fragment (this=0x815b7e8, p_in=0x815e368)
   at ../elements/ip/ipfragmenter.cc:102
#1  0x080d39b5 in FromDevice::selected (this=0x815b6a8) at element.hh:314
#2  0x0810f6b3 in Master::run_selects (this=0x815b3b8, more_tasks=false)
   at ../lib/master.cc:597
#3  0x08103a30 in RouterThread::driver (this=0x815b4a8) at 
routerthread.hh:161
#4  0x080e9c73 in main (argc=3, argv=0xbffff7b4) at master.hh:121

After it I decide to insert some debugging messages and found it -
(gdb) run -f click.lo
The program being debugged has been started already.
Start it from the beginning? (y or n) y
`/usr/local/bin/click' has changed; re-reading symbols.

Starting program: /usr/local/bin/click -f click.lo
DEBUG00, ip_in=0x0

Program received signal SIGSEGV, Segmentation fault.
0x08093f8b in IPFragmenter::fragment (this=0x815b828, p_in=0x815e3a8)
   at ../elements/ip/ipfragmenter.cc:104
/home/kaanoken/works/click-1.4.3/elements/ip/ipfragmenter.cc:104:2703:beg:0x8093 

f8b

It's located in the elements/ip/ipfragmenter.cc on the line 99:
const click_ip *ip_in = p_in->ip_header();
click_chatter("DEBUG00, ip_in=0x%X", ip_in);
We have the ip_in is NULL.

it's really a bad thing,
what are you can said about this?

PS I was trying it on the linux box w/o kernel modules.

Thanx.

-- 
Alfeiks Kaänoken,
UNIX Software Developer.