[kees:for-next/overflow 30/30] fs/udf/super.c:2525:61: warning: array subscript '__builtin_bswap32 (_61) + 4294967295' is outside the bounds of an interior zero-length array '__le32[0]' {aka 'unsigned int[]'}

From: kernel test robot
Date: Thu Aug 26 2021 - 05:33:31 EST

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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: s390-allyesconfig (attached as .config)
compiler: s390-linux-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=s390

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

All warnings (new ones prefixed by >>):

In file included from include/linux/swab.h:5,
from include/uapi/linux/byteorder/big_endian.h:13,
from include/linux/byteorder/big_endian.h:5,
from arch/s390/include/uapi/asm/byteorder.h:5,
from include/asm-generic/bitops/le.h:7,
from arch/s390/include/asm/bitops.h:393,
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 '__builtin_bswap32 (_61) + 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/swab.h:115:54: note: in definition of macro '__swab32'
115 | #define __swab32(x) (__u32)__builtin_bswap32((__u32)(x))
| ^
include/linux/byteorder/generic.h:89:21: note: in expansion of macro '__le32_to_cpu'
89 | #define le32_to_cpu __le32_to_cpu
| ^~~~~~~~~~~~~
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

^1da177e4c3f4152 Linus Torvalds 2005-04-16 2499
cb00ea3528eb3c09 Cyrill Gorcunov 2007-07-19 2500 static unsigned int udf_count_free(struct super_block *sb)
^1da177e4c3f4152 Linus Torvalds 2005-04-16 2501 {
^1da177e4c3f4152 Linus Torvalds 2005-04-16 2502 unsigned int accum = 0;
a4a8b99ec819ca60 Jan Kara 2020-01-07 2503 struct udf_sb_info *sbi = UDF_SB(sb);
6c79e987d629cb0f Marcin Slusarz 2008-02-08 2504 struct udf_part_map *map;
a4a8b99ec819ca60 Jan Kara 2020-01-07 2505 unsigned int part = sbi->s_partition;
a4a8b99ec819ca60 Jan Kara 2020-01-07 2506 int ptype = sbi->s_partmaps[part].s_partition_type;
a4a8b99ec819ca60 Jan Kara 2020-01-07 2507
a4a8b99ec819ca60 Jan Kara 2020-01-07 2508 if (ptype == UDF_METADATA_MAP25) {
a4a8b99ec819ca60 Jan Kara 2020-01-07 2509 part = sbi->s_partmaps[part].s_type_specific.s_metadata.
a4a8b99ec819ca60 Jan Kara 2020-01-07 2510 s_phys_partition_ref;
a4a8b99ec819ca60 Jan Kara 2020-01-07 2511 } else if (ptype == UDF_VIRTUAL_MAP15 || ptype == UDF_VIRTUAL_MAP20) {
a4a8b99ec819ca60 Jan Kara 2020-01-07 2512 /*
a4a8b99ec819ca60 Jan Kara 2020-01-07 2513 * Filesystems with VAT are append-only and we cannot write to
a4a8b99ec819ca60 Jan Kara 2020-01-07 2514 * them. Let's just report 0 here.
a4a8b99ec819ca60 Jan Kara 2020-01-07 2515 */
a4a8b99ec819ca60 Jan Kara 2020-01-07 2516 return 0;
a4a8b99ec819ca60 Jan Kara 2020-01-07 2517 }
^1da177e4c3f4152 Linus Torvalds 2005-04-16 2518
6c79e987d629cb0f Marcin Slusarz 2008-02-08 2519 if (sbi->s_lvid_bh) {
4b11111aba6c80cc Marcin Slusarz 2008-02-08 2520 struct logicalVolIntegrityDesc *lvid =
4b11111aba6c80cc Marcin Slusarz 2008-02-08 2521 (struct logicalVolIntegrityDesc *)
4b11111aba6c80cc Marcin Slusarz 2008-02-08 2522 sbi->s_lvid_bh->b_data;
a4a8b99ec819ca60 Jan Kara 2020-01-07 2523 if (le32_to_cpu(lvid->numOfPartitions) > part) {
4b11111aba6c80cc Marcin Slusarz 2008-02-08 2524 accum = le32_to_cpu(
a4a8b99ec819ca60 Jan Kara 2020-01-07 @2525 lvid->freeSpaceTable[part]);
^1da177e4c3f4152 Linus Torvalds 2005-04-16 2526 if (accum == 0xFFFFFFFF)
^1da177e4c3f4152 Linus Torvalds 2005-04-16 2527 accum = 0;
^1da177e4c3f4152 Linus Torvalds 2005-04-16 2528 }
^1da177e4c3f4152 Linus Torvalds 2005-04-16 2529 }
^1da177e4c3f4152 Linus Torvalds 2005-04-16 2530
^1da177e4c3f4152 Linus Torvalds 2005-04-16 2531 if (accum)
^1da177e4c3f4152 Linus Torvalds 2005-04-16 2532 return accum;
^1da177e4c3f4152 Linus Torvalds 2005-04-16 2533
a4a8b99ec819ca60 Jan Kara 2020-01-07 2534 map = &sbi->s_partmaps[part];
6c79e987d629cb0f Marcin Slusarz 2008-02-08 2535 if (map->s_partition_flags & UDF_PART_FLAG_UNALLOC_BITMAP) {
28de7948a896763b Cyrill Gorcunov 2007-07-21 2536 accum += udf_count_free_bitmap(sb,
6c79e987d629cb0f Marcin Slusarz 2008-02-08 2537 map->s_uspace.s_bitmap);
28de7948a896763b Cyrill Gorcunov 2007-07-21 2538 }
^1da177e4c3f4152 Linus Torvalds 2005-04-16 2539 if (accum)
^1da177e4c3f4152 Linus Torvalds 2005-04-16 2540 return accum;
^1da177e4c3f4152 Linus Torvalds 2005-04-16 2541
6c79e987d629cb0f Marcin Slusarz 2008-02-08 2542 if (map->s_partition_flags & UDF_PART_FLAG_UNALLOC_TABLE) {
28de7948a896763b Cyrill Gorcunov 2007-07-21 2543 accum += udf_count_free_table(sb,
6c79e987d629cb0f Marcin Slusarz 2008-02-08 2544 map->s_uspace.s_table);
28de7948a896763b Cyrill Gorcunov 2007-07-21 2545 }
^1da177e4c3f4152 Linus Torvalds 2005-04-16 2546 return accum;
^1da177e4c3f4152 Linus Torvalds 2005-04-16 2547 }
54bb60d53114b834 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 <jack@xxxxxxx>
:::::: CC: Jan Kara <jack@xxxxxxx>

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

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