Re: [PATCH bpf-next 1/2] bpf: fix NULL pointer dereference in bpf_get_local_storage() helper

[kernel test robot <lkp@xxxxxxxxx>]

Hi Yonghong,

I love your patch! Yet something to improve:

[auto build test ERROR on next-20210318]
[cannot apply to bpf-next/master bpf/master v5.12-rc3 v5.12-rc2 v5.12-rc1 v5.12-rc3]
[If your patch is applied to the wrong git tree, kindly drop us a note.
And when submitting patch, we suggest to use '--base' as documented in
https://git-scm.com/docs/git-format-patch]

url:    https://github.com/0day-ci/linux/commits/Yonghong-Song/bpf-fix-NULL-pointer-dereference-in/20210319-082140
base:    ba5b053ab3ac674b91a6669086139819359a5e6e
config: i386-randconfig-a005-20210318 (attached as .config)
compiler: gcc-9 (Debian 9.3.0-22) 9.3.0
reproduce (this is a W=1 build):
        # https://github.com/0day-ci/linux/commit/38b56e03d083be940fe9dc231c5f6c8f4f282f15
        git remote add linux-review https://github.com/0day-ci/linux
        git fetch --no-tags linux-review Yonghong-Song/bpf-fix-NULL-pointer-dereference-in/20210319-082140
        git checkout 38b56e03d083be940fe9dc231c5f6c8f4f282f15
        # save the attached .config to linux build tree
        make W=1 ARCH=i386 

If you fix the issue, kindly add following tag as appropriate
Reported-by: kernel test robot <lkp@xxxxxxxxx>

All errors (new ones prefixed by >>):

   In file included from include/asm-generic/percpu.h:7,
                    from arch/x86/include/asm/percpu.h:390,
                    from arch/x86/include/asm/current.h:6,
                    from arch/x86/include/asm/processor.h:17,
                    from arch/x86/include/asm/timex.h:5,
                    from include/linux/timex.h:65,
                    from include/linux/time32.h:13,
                    from include/linux/time.h:60,
                    from include/linux/ktime.h:24,
                    from include/linux/timer.h:6,
                    from include/linux/workqueue.h:9,
                    from include/linux/bpf.h:9,
                    from include/linux/bpf-cgroup.h:5,
                    from kernel/bpf/local_storage.c:2:
>> kernel/bpf/local_storage.c:13:33: error: 'BPF_CGROUP_STORAGE_NEST_MAX' undeclared here (not in a function); did you mean 'BPF_CGROUP_STORAGE_PERCPU'?
      13 |         bpf_cgroup_storage_info[BPF_CGROUP_STORAGE_NEST_MAX]);
         |                                 ^~~~~~~~~~~~~~~~~~~~~~~~~~~
   include/linux/percpu-defs.h:104:37: note: in definition of macro 'DEFINE_PER_CPU_SECTION'
     104 |  __PCPU_ATTRS(sec) __typeof__(type) name
         |                                     ^~~~
   kernel/bpf/local_storage.c:12:1: note: in expansion of macro 'DEFINE_PER_CPU'
      12 | DEFINE_PER_CPU(struct bpf_cgroup_storage_info,
         | ^~~~~~~~~~~~~~


vim +13 kernel/bpf/local_storage.c

    11	
    12	DEFINE_PER_CPU(struct bpf_cgroup_storage_info,
  > 13		       bpf_cgroup_storage_info[BPF_CGROUP_STORAGE_NEST_MAX]);
    14	

---
0-DAY CI Kernel Test Service, Intel Corporation
https://lists.01.org/hyperkitty/list/kbuild-all@xxxxxxxxxxxx

Attachment: .config.gz
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