Re: [PATCH bpf-next 1/3] bpf: Check unsupported ops from the bpf_struct_ops's cfi_stubs

[kernel test robot <lkp@intel.com>]

Hi Martin,

kernel test robot noticed the following build warnings:

[auto build test WARNING on bpf-next/master]

url:    https://github.com/intel-lab-lkp/linux/commits/Martin-KaFai-Lau/bpf-Check-unsupported-ops-from-the-bpf_struct_ops-s-cfi_stubs/20240720-144313
base:   https://git.kernel.org/pub/scm/linux/kernel/git/bpf/bpf-next.git master
patch link:    https://lore.kernel.org/r/20240720062233.2319723-2-martin.lau%40linux.dev
patch subject: [PATCH bpf-next 1/3] bpf: Check unsupported ops from the bpf_struct_ops's cfi_stubs
config: i386-randconfig-001-20240720 (https://download.01.org/0day-ci/archive/20240720/202407202244.HvnUVyjM-lkp@intel.com/config)
compiler: gcc-7 (Ubuntu 7.5.0-6ubuntu2) 7.5.0
reproduce (this is a W=1 build): (https://download.01.org/0day-ci/archive/20240720/202407202244.HvnUVyjM-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/202407202244.HvnUVyjM-lkp@intel.com/

All warnings (new ones prefixed by >>):

   kernel/bpf/bpf_struct_ops.c: In function 'bpf_struct_ops_supported':
>> kernel/bpf/bpf_struct_ops.c:1045:48: warning: dereferencing 'void *' pointer
     void *func_ptr = *(void **)(&st_ops->cfi_stubs[moff]);
                                                   ^


vim +1045 kernel/bpf/bpf_struct_ops.c

  1042	
  1043	int bpf_struct_ops_supported(const struct bpf_struct_ops *st_ops, u32 moff)
  1044	{
> 1045		void *func_ptr = *(void **)(&st_ops->cfi_stubs[moff]);
  1046	
  1047		return func_ptr ? 0 : -ENOTSUPP;
  1048	}
  1049	

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