On Friday 2008-11-21 15:51, David Wu wrote:
> My question:
> 1 why tries to allocate 0 size memory, it is useful?
array_elems = (h->num_chains / list_length) +
(h->num_chains % list_length ? 1 : 0);
array_mem = sizeof(h->chain_index) * array_elems;
Logically,
array_mem == 0 => (sizeof(h->chain_index) == 0) ^ (array_elems == 0).
And given that sizeof() is unlikely to return 0 here, array_elems must
be 0. And the only way array_elems can be 0 is that h->num_chains <
list_length && h->num_chains == 0. Buf if you have 0 chains to start
with, it sounds like it really could not get the filter to table to
work. gdb will help.
> 2 is there any problem to the iptables program in my change?
> I may have to rebuild the toolchain so malloc will return a live
> pointer for 0 size allocation.
> 3 I have got the error
> ip_tables: ERROR target: invalid size 30 != 32
> from 1.3.7 and 1.4.2 (didn't try other versions) and sent to this list
> a question before but haven't received any answer
It needs the same ABI, as was answered before:
http://marc.info/?l=netfilter-devel&m=122309437709848&w=2
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