linux-kernel - iommufd_utils.h:804:37: warning: array subscript 'struct iommu_test_hw_info[0]' is partly outside array bounds of 'struct iommu_test_hw_info_buffer

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Message-ID: <aP4lte2sKP7ekvt+@rli9-mobl>
Date: Sun, 26 Oct 2025 21:44:21 +0800
From: kernel test robot <lkp@...el.com>
To: Yi Liu <yi.l.liu@...el.com>
CC: <oe-kbuild-all@...ts.linux.dev>, <linux-kernel@...r.kernel.org>, "Jason
 Gunthorpe" <jgg@...pe.ca>, Nicolin Chen <nicolinc@...dia.com>
Subject: iommufd_utils.h:804:37: warning: array subscript 'struct
 iommu_test_hw_info[0]' is partly outside array bounds of 'struct
 iommu_test_hw_info_buffer_smaller[1]'

tree:   https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git master
head:   72761a7e31225971d0b29d9195e0ffa986b77867
commit: 6d9500bb1ff8c7f9c3ce199521c41aa41e8fd994 iommufd/selftest: Add coverage for reporting max_pasid_log2 via IOMMU_HW_INFO
date:   7 months ago
:::::: branch date: 14 hours ago
:::::: commit date: 7 months ago
config: x86_64-allnoconfig-bpf (https://download.01.org/0day-ci/archive/20251026/202510261537.q8PGKcsW-lkp@intel.com/config)
compiler: gcc-14 (Debian 14.2.0-19) 14.2.0
reproduce (this is a W=1 build): (https://download.01.org/0day-ci/archive/20251026/202510261537.q8PGKcsW-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@...el.com>
| Closes: https://lore.kernel.org/r/202510261537.q8PGKcsW-lkp@intel.com/

All warnings (new ones prefixed by >>):

   In file included from iommufd_utils.h:11,
                    from iommufd.c:12:
   In function '_test_cmd_get_hw_info',
       inlined from 'iommufd_ioas_get_hw_info' at iommufd.c:779:3,
       inlined from 'wrapper_iommufd_ioas_get_hw_info' at iommufd.c:752:1:
>> iommufd_utils.h:804:37: warning: array subscript 'struct iommu_test_hw_info[0]' is partly outside array bounds of 'struct iommu_test_hw_info_buffer_smaller[1]' [-Warray-bounds=]
     804 |                         assert(!info->flags);
         |                                 ~~~~^~~~~~~
   iommufd.c: In function 'wrapper_iommufd_ioas_get_hw_info':
   iommufd.c:761:11: note: object 'buffer_smaller' of size 4
     761 |         } buffer_smaller;
         |           ^~~~~~~~~~~~~~

-- 
0-DAY CI Kernel Test Service
https://github.com/intel/lkp-tests/wiki