Re: [lwip-devel] Particular size of ping can halt lwIP -- a pbuf_copy bug?

[narke]

On Saturday, 28 April 2012, Kieran Mansley  wrote:
> On 27 Apr 2012, at 07:47, narke wrote:
>
> > The problem is, pbuf_copy has a
> > bug in handling such kind of source pbuf chain and the LWIP_ASSERT
> > statement (line 843 of pbuf.c in version 1.4.0) will evaluate false.
> >
> > I think this is a pbuf_copy() bug and want your confirmation.
>
> It sounds like a bug, but I'm not sure if it is in pbuf_copy or the calling code.  Is it just that pbuf_copy doesn't handle a pbuf of length 0?
>
> Kieran

In my opinion, the PPP who created the kind of pbufs chain, which although looks a little strange but should be valid in form.  Therefore it's a problem of the handling code.   Yes, I do think it's pbuf_copy doesn't handle length 0 pbuf in the 2nd element of pbuf list.

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narke
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