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


From: Martin Birkebæk , IO-Connect ApS
Subject: [lwip-users] lwip 1.3.0 "ping of death"
Date: Mon, 7 Apr 2008 16:25:47 +0200

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

 

Attachment: lwipopts.h
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