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Re: [lwip-users] Reassembles incoming IP crash my system

From: Christiaan Simons
Subject: Re: [lwip-users] Reassembles incoming IP crash my system
Date: Tue, 21 Mar 2006 09:17:29 +0100

Amir wrote:

> I am using lwip under mpc5200 and it work fine, until a client send a big
> packet. In this case the lwip crash on
> Ip_frag.c: line 263
> memcpy(q->payload, &ip_reassbuf[i],
>             q->len > ip_reasslen - i ? ip_reasslen - i : q->len);
> Then I disable reasemble big IP in lwipopts.h, so that such packets will
> droped.
> It crash in my case by using "ping" like:
> Ping host -s 1524
> Is that a bug or I have may forgot something?

Yes, I also found this piece of code a bit suspect / not robust.

I had to fix a bug in my network driver to get this in a workable state.

Make sure your ethernet driver uses correct MTU, then it should work.


Christiaan Simons

Hardware Designer
Axon Digital Design


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