I am trying to run iptables (1.4.2 release)on a MCF53281(m68knommu, 2.6.26
kernel) embedded board.
It failed with "
iptables v1.4.2: can't initialize iptables table `filter': No
chain/target/match by that name
Perhaps iptables or your kernel needs to be upgraded.
I traced the calls and found out that it failed at
iptcc_chain_index_alloc():
h->chain_index = malloc(array_mem);
in the first call to iptcc_chain_index_alloc() array_mem is 0 which means
malloc(0) is called in the above statement.
depends on the implementation malloc(0) may return NULL which is the case
for m68k-uclinux-gcc(gcc version 4.2.3 and uClibc-0.9.29-20081003)
I have changed the code to:
if(array_mem == 0)
h->chain_index = malloc(1);
else
h->chain_index = malloc(array_mem);
and it works(while I have to fix another error -- ip_tables: ERROR target:
invalid size 30 != 32)
My question:
1 why tries to allocate 0 size memory, it is useful?
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
then I assume I have done something wrong.
If this is not the correct mailing list for these questions then can
someone let me know the right mailing list ?
thanks,
David Wu
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