Re: [lwip-users] lwip 1.3.0 "ping of death"

[Valdemar]

Hi
I reported the same or a very similar problem 2008-01-29 in thread 
"ip_reass stop"
with both ping and UDP.
It didn't get fixed and I avoided the problem by disabling fragmentation 
as I really
didn't need it.
Germund Asp


Martin Honeywill skrev:
> I Guess it should still not cause LWIP to crash, even if the packets 
> are fragmented.
> Martin
>
> ------------------------------------------------------------------------
> *From:* Bill Auerbach [mailto:address@hidden
> *Sent:* 07 April 2008 17:00
> *To:* 'Mailing list for lwIP users'
> *Subject:* RE: [lwip-users] lwip 1.3.0 "ping of death"
>
> Maybe ICMP doesn’t support fragmentation and you need to use ping –f 
> to tell it not to fragment?
>
> Bill
>
> ------------------------------------------------------------------------
>
> *From:* address@hidden 
> [mailto:address@hidden *On 
> Behalf Of *Martin Birkebæk, IO-Connect ApS
> *Sent:* Monday, April 07, 2008 10:26 AM
> *To:* address@hidden
> *Subject:* [lwip-users] lwip 1.3.0 "ping of death"
>
> Hi list,
>
> I have succesfully ported lwip 1.3.0 to LPC2468. Lwip is running in a 
> threaded environment, FreeRTOS. I have a basic example running, with a 
> webserver.
>
> I have enabled ip reassembly, see my lwipopts.h file attached to this 
> mail.
>
> I have a webbrowser running, which is requesting a webpage from the 
> webserver each second, and I am pinging the system continually, 
> through the command
>
> Ping <ip> -t
>
> The system is running ok. But if I ping the system with a lot of data 
> bytes, i.e. ping <ip> -l 2048. The system crashes.
>
> I end up in an data abort exception. The reason for this exception, is 
> a pointer, r, in function ip_reass() is containing an invalid address.
>
> The line in C code is:
>
> iprh = (struct ip_reass_helper*)r->payload; // line number: 572 in 
> ip_frag.c
>
> What can I do, to avoid this “ping of death” ?
>
> P.S.: Please be aware that I have yet to optimize the system regarding 
> values in lwipopts.h. But that will be a topic for another question on 
> this list.
>
> Regards,
>
> Martin
>
> ------------------------------------------------------------------------
>
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