tree: https://git.kernel.org/pub/scm/linux/kernel/git/kees/linux.git for-next/overflow head: 7d8aac16a0a831d3ce4948ed18d812ad2e2224ac commit: 7d8aac16a0a831d3ce4948ed18d812ad2e2224ac [30/30] Makefile: Enable -Wzero-length-bounds config: arm-imx_v6_v7_defconfig (attached as .config) compiler: arm-linux-gnueabi-gcc (GCC) 11.2.0 reproduce (this is a W=1 build): wget https://raw.githubusercontent.com/intel/lkp-tests/master/sbin/make.cross -O ~/bin/make.cross chmod +x ~/bin/make.cross # https://git.kernel.org/pub/scm/linux/kernel/git/kees/linux.git/commit/?id=7d8aac16a0a831d3ce4948ed18d812ad2e2224ac git remote add kees https://git.kernel.org/pub/scm/linux/kernel/git/kees/linux.git git fetch --no-tags kees for-next/overflow git checkout 7d8aac16a0a831d3ce4948ed18d812ad2e2224ac # save the attached .config to linux build tree COMPILER_INSTALL_PATH=$HOME/0day COMPILER=gcc-11.2.0 make.cross ARCH=arm If you fix the issue, kindly add following tag as appropriate Reported-by: kernel test robot All warnings (new ones prefixed by >>): In file included from include/linux/byteorder/little_endian.h:5, from arch/arm/include/uapi/asm/byteorder.h:22, from include/asm-generic/bitops/le.h:7, from arch/arm/include/asm/bitops.h:268, from include/linux/bitops.h:32, from include/linux/kernel.h:12, from include/linux/list.h:9, from include/linux/wait.h:7, from include/linux/wait_bit.h:8, from include/linux/fs.h:6, from fs/udf/udfdecl.h:10, from fs/udf/super.c:41: fs/udf/super.c: In function 'udf_statfs': >> fs/udf/super.c:2525:61: warning: array subscript 'lvid_60->numOfPartitions + 4294967295' is outside the bounds of an interior zero-length array '__le32[0]' {aka 'unsigned int[]'} [-Wzero-length-bounds] 2525 | lvid->freeSpaceTable[part]); include/uapi/linux/byteorder/little_endian.h:34:51: note: in definition of macro '__le32_to_cpu' 34 | #define __le32_to_cpu(x) ((__force __u32)(__le32)(x)) | ^ fs/udf/super.c:2524:33: note: in expansion of macro 'le32_to_cpu' 2524 | accum = le32_to_cpu( | ^~~~~~~~~~~ In file included from fs/udf/udfdecl.h:7, from fs/udf/super.c:41: fs/udf/ecma_167.h:363:33: note: while referencing 'freeSpaceTable' 363 | __le32 freeSpaceTable[0]; | ^~~~~~~~~~~~~~ vim +2525 fs/udf/super.c ^1da177e4c3f41 Linus Torvalds 2005-04-16 2499 cb00ea3528eb3c Cyrill Gorcunov 2007-07-19 2500 static unsigned int udf_count_free(struct super_block *sb) ^1da177e4c3f41 Linus Torvalds 2005-04-16 2501 { ^1da177e4c3f41 Linus Torvalds 2005-04-16 2502 unsigned int accum = 0; a4a8b99ec819ca Jan Kara 2020-01-07 2503 struct udf_sb_info *sbi = UDF_SB(sb); 6c79e987d629cb Marcin Slusarz 2008-02-08 2504 struct udf_part_map *map; a4a8b99ec819ca Jan Kara 2020-01-07 2505 unsigned int part = sbi->s_partition; a4a8b99ec819ca Jan Kara 2020-01-07 2506 int ptype = sbi->s_partmaps[part].s_partition_type; a4a8b99ec819ca Jan Kara 2020-01-07 2507 a4a8b99ec819ca Jan Kara 2020-01-07 2508 if (ptype == UDF_METADATA_MAP25) { a4a8b99ec819ca Jan Kara 2020-01-07 2509 part = sbi->s_partmaps[part].s_type_specific.s_metadata. a4a8b99ec819ca Jan Kara 2020-01-07 2510 s_phys_partition_ref; a4a8b99ec819ca Jan Kara 2020-01-07 2511 } else if (ptype == UDF_VIRTUAL_MAP15 || ptype == UDF_VIRTUAL_MAP20) { a4a8b99ec819ca Jan Kara 2020-01-07 2512 /* a4a8b99ec819ca Jan Kara 2020-01-07 2513 * Filesystems with VAT are append-only and we cannot write to a4a8b99ec819ca Jan Kara 2020-01-07 2514 * them. Let's just report 0 here. a4a8b99ec819ca Jan Kara 2020-01-07 2515 */ a4a8b99ec819ca Jan Kara 2020-01-07 2516 return 0; a4a8b99ec819ca Jan Kara 2020-01-07 2517 } ^1da177e4c3f41 Linus Torvalds 2005-04-16 2518 6c79e987d629cb Marcin Slusarz 2008-02-08 2519 if (sbi->s_lvid_bh) { 4b11111aba6c80 Marcin Slusarz 2008-02-08 2520 struct logicalVolIntegrityDesc *lvid = 4b11111aba6c80 Marcin Slusarz 2008-02-08 2521 (struct logicalVolIntegrityDesc *) 4b11111aba6c80 Marcin Slusarz 2008-02-08 2522 sbi->s_lvid_bh->b_data; a4a8b99ec819ca Jan Kara 2020-01-07 2523 if (le32_to_cpu(lvid->numOfPartitions) > part) { 4b11111aba6c80 Marcin Slusarz 2008-02-08 2524 accum = le32_to_cpu( a4a8b99ec819ca Jan Kara 2020-01-07 @2525 lvid->freeSpaceTable[part]); ^1da177e4c3f41 Linus Torvalds 2005-04-16 2526 if (accum == 0xFFFFFFFF) ^1da177e4c3f41 Linus Torvalds 2005-04-16 2527 accum = 0; ^1da177e4c3f41 Linus Torvalds 2005-04-16 2528 } ^1da177e4c3f41 Linus Torvalds 2005-04-16 2529 } ^1da177e4c3f41 Linus Torvalds 2005-04-16 2530 ^1da177e4c3f41 Linus Torvalds 2005-04-16 2531 if (accum) ^1da177e4c3f41 Linus Torvalds 2005-04-16 2532 return accum; ^1da177e4c3f41 Linus Torvalds 2005-04-16 2533 a4a8b99ec819ca Jan Kara 2020-01-07 2534 map = &sbi->s_partmaps[part]; 6c79e987d629cb Marcin Slusarz 2008-02-08 2535 if (map->s_partition_flags & UDF_PART_FLAG_UNALLOC_BITMAP) { 28de7948a89676 Cyrill Gorcunov 2007-07-21 2536 accum += udf_count_free_bitmap(sb, 6c79e987d629cb Marcin Slusarz 2008-02-08 2537 map->s_uspace.s_bitmap); 28de7948a89676 Cyrill Gorcunov 2007-07-21 2538 } ^1da177e4c3f41 Linus Torvalds 2005-04-16 2539 if (accum) ^1da177e4c3f41 Linus Torvalds 2005-04-16 2540 return accum; ^1da177e4c3f41 Linus Torvalds 2005-04-16 2541 6c79e987d629cb Marcin Slusarz 2008-02-08 2542 if (map->s_partition_flags & UDF_PART_FLAG_UNALLOC_TABLE) { 28de7948a89676 Cyrill Gorcunov 2007-07-21 2543 accum += udf_count_free_table(sb, 6c79e987d629cb Marcin Slusarz 2008-02-08 2544 map->s_uspace.s_table); 28de7948a89676 Cyrill Gorcunov 2007-07-21 2545 } ^1da177e4c3f41 Linus Torvalds 2005-04-16 2546 return accum; ^1da177e4c3f41 Linus Torvalds 2005-04-16 2547 } 54bb60d53114b8 Fabian Frederick 2017-01-06 2548 :::::: The code at line 2525 was first introduced by commit :::::: a4a8b99ec819ca60b49dc582a4287ef03411f117 udf: Fix free space reporting for metadata and virtual partitions :::::: TO: Jan Kara :::::: CC: Jan Kara --- 0-DAY CI Kernel Test Service, Intel Corporation https://lists.01.org/hyperkitty/list/kbuild-all@lists.01.org