[masahiroy-kbuild:kbuild 5/7] kernel/kallsyms.c:181:56: warning: array subscript [0, 0] is outside array bounds of 'const int[1]'

[masahiroy-kbuild:kbuild 5/7] kernel/kallsyms.c:181:56: warning: array subscript [0, 0] is outside array bounds of 'const int[1]'

[kernel test robot]

tree:   https://git.kernel.org/pub/scm/linux/kernel/git/masahiroy/linux-kbuild.git kbuild
head:   8246a1e9b922c0e797ec28d8a602de1384ff8140
commit: 0bdad28369fc5e93de39b5046228ed78e982fc71 [5/7] kallsyms: Avoid weak references for kallsyms symbols
config: i386-buildonly-randconfig-003-20240423 (https://download.01.org/0day-ci/archive/20240423/202404231047.eZ27wCnE-lkp@intel.com/config)
compiler: gcc-9 (Ubuntu 9.5.0-4ubuntu2) 9.5.0
reproduce (this is a W=1 build): (https://download.01.org/0day-ci/archive/20240423/202404231047.eZ27wCnE-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/202404231047.eZ27wCnE-lkp@intel.com/

All warnings (new ones prefixed by >>):

   kernel/kallsyms.c: In function 'get_symbol_pos':
>> kernel/kallsyms.c:181:56: warning: array subscript [0, 0] is outside array bounds of 'const int[1]' [-Warray-bounds]
     181 |   return kallsyms_relative_base + (u32)kallsyms_offsets[idx];
         |                                        ~~~~~~~~~~~~~~~~^~~~~
   kernel/kallsyms.c:48:18: note: while referencing 'kallsyms_offsets'
      48 | const int __weak kallsyms_offsets[1];
         |                  ^~~~~~~~~~~~~~~~


vim +181 kernel/kallsyms.c

^1da177e4c3f415 Linus Torvalds 2005-04-16  173  
30f3bb09778de64 Zhen Lei       2022-11-15  174  unsigned long kallsyms_sym_address(int idx)
2213e9a66bb87d8 Ard Biesheuvel 2016-03-15  175  {
2213e9a66bb87d8 Ard Biesheuvel 2016-03-15  176  	if (!IS_ENABLED(CONFIG_KALLSYMS_BASE_RELATIVE))
2213e9a66bb87d8 Ard Biesheuvel 2016-03-15  177  		return kallsyms_addresses[idx];
2213e9a66bb87d8 Ard Biesheuvel 2016-03-15  178  
2213e9a66bb87d8 Ard Biesheuvel 2016-03-15  179  	/* values are unsigned offsets if --absolute-percpu is not in effect */
2213e9a66bb87d8 Ard Biesheuvel 2016-03-15  180  	if (!IS_ENABLED(CONFIG_KALLSYMS_ABSOLUTE_PERCPU))
2213e9a66bb87d8 Ard Biesheuvel 2016-03-15 @181  		return kallsyms_relative_base + (u32)kallsyms_offsets[idx];
2213e9a66bb87d8 Ard Biesheuvel 2016-03-15  182  
2213e9a66bb87d8 Ard Biesheuvel 2016-03-15  183  	/* ...otherwise, positive offsets are absolute values */
2213e9a66bb87d8 Ard Biesheuvel 2016-03-15  184  	if (kallsyms_offsets[idx] >= 0)
2213e9a66bb87d8 Ard Biesheuvel 2016-03-15  185  		return kallsyms_offsets[idx];
2213e9a66bb87d8 Ard Biesheuvel 2016-03-15  186  
2213e9a66bb87d8 Ard Biesheuvel 2016-03-15  187  	/* ...and negative offsets are relative to kallsyms_relative_base - 1 */
2213e9a66bb87d8 Ard Biesheuvel 2016-03-15  188  	return kallsyms_relative_base - 1 - kallsyms_offsets[idx];
2213e9a66bb87d8 Ard Biesheuvel 2016-03-15  189  }
2213e9a66bb87d8 Ard Biesheuvel 2016-03-15  190  

:::::: The code at line 181 was first introduced by commit
:::::: 2213e9a66bb87d8344a1256b4ef568220d9587fb kallsyms: add support for relative offsets in kallsyms address table

:::::: TO: Ard Biesheuvel <ard.biesheuvel@linaro.org>
:::::: CC: Linus Torvalds <torvalds@linux-foundation.org>

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