Re: [PATCH nf] netfilter: synproxy: prevent unbounded recursion in transmit path

[Fernando Fernandez Mancera <fmancera@suse.de>]

On 11/4/26 1:59 AM, kernel test robot wrote:
> Hi Fernando,
> 
> kernel test robot noticed the following build errors:
> 
> [auto build test ERROR on netfilter-nf/main]
> 
> url:    https://github.com/intel-lab-lkp/linux/commits/Fernando-Fernandez-Mancera/netfilter-synproxy-prevent-unbounded-recursion-in-transmit-path/20261103-135638
> base:   https://git.kernel.org/pub/scm/linux/kernel/git/netfilter/nf.git main
> patch link:    https://lore.kernel.org/r/20261103125638.4667-1-fmancera%40suse.de
> patch subject: [PATCH nf] netfilter: synproxy: prevent unbounded recursion in transmit path
> config: s390-defconfig (https://download.01.org/0day-ci/archive/20261104/202611040824.Zozbyqd6-lkp@intel.com/config)
> compiler: clang version 18.1.8 (https://github.com/llvm/llvm-project 3b5b5c1ec4a3095ab096dd780e84d7ab81f3d7ff)
> reproduce (this is a W=1 build): (https://download.01.org/0day-ci/archive/20261104/202611040824.Zozbyqd6-lkp@intel.com/reproduce)
> 
> If you fix the issue in a separate patch/commit (i.e. not just a new version of
> the same patch/commit), kindly add following tags
> | Reported-by: kernel test robot <lkp@intel.com>
> | Closes: https://lore.kernel.org/oe-kbuild-all/202611040824.Zozbyqd6-lkp@intel.com/
> 
> All errors (new ones prefixed by >>):
> 
>>> net/netfilter/nf_synproxy_core.c:24:10: fatal error: 'net/netfilter/nf_recursion.h' file not found
>        24 | #include <net/netfilter/nf_recursion.h>
>           |          ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
>     1 error generated.
> 
> 
> vim +24 net/netfilter/nf_synproxy_core.c
> 
>      16	
>      17	#include <net/netfilter/nf_conntrack.h>
>      18	#include <net/netfilter/nf_conntrack_ecache.h>
>      19	#include <net/netfilter/nf_conntrack_extend.h>
>      20	#include <net/netfilter/nf_conntrack_seqadj.h>
>      21	#include <net/netfilter/nf_conntrack_synproxy.h>
>      22	#include <net/netfilter/nf_conntrack_zones.h>
>      23	#include <net/netfilter/nf_synproxy.h>
>    > 24	#include <net/netfilter/nf_recursion.h>
>      25	
> 
> --
> 0-DAY CI Kernel Test Service
> https://github.com/intel/lkp-tests/wiki

The patch depends on 
https://lore.kernel.org/netfilter-devel/20261104090224.750548-2-pablo@netfilter.org/

So the robot errors are not very relevant. We can ignore them. The patch 
was tested with that commit as a base.

Thanks,
Fernando.