linux-kernel - drivers/net/ethernet/mellanox/mlxsw/core_linecards.c:776:9: warning: '.bin' directive output may be truncated writing 4 bytes into a region of size between 3 and 11

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Message-ID: <202310182014.0kOuH8vx-lkp@intel.com>
Date:   Wed, 18 Oct 2023 20:32:45 +0800
From:   kernel test robot <lkp@...el.com>
To:     Jiri Pirko <jiri@...dia.com>
Cc:     oe-kbuild-all@...ts.linux.dev, linux-kernel@...r.kernel.org,
        Ido Schimmel <idosch@...dia.com>
Subject: drivers/net/ethernet/mellanox/mlxsw/core_linecards.c:776:9: warning:
 '.bin' directive output may be truncated writing 4 bytes into a region of
 size between 3 and 11

tree:   https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git master
head:   06dc10eae55b5ceabfef287a7e5f16ceea204aa0
commit: b217127e5e4ee0ecfce7c5f84cfe082238123bda mlxsw: core_linecards: Add line card objects and implement provisioning
date:   1 year, 6 months ago
config: riscv-randconfig-r001-20230902 (https://download.01.org/0day-ci/archive/20231018/202310182014.0kOuH8vx-lkp@intel.com/config)
compiler: riscv32-linux-gcc (GCC) 13.2.0
reproduce (this is a W=1 build): (https://download.01.org/0day-ci/archive/20231018/202310182014.0kOuH8vx-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/oe-kbuild-all/202310182014.0kOuH8vx-lkp@intel.com/

All warnings (new ones prefixed by >>):

   drivers/net/ethernet/mellanox/mlxsw/core_linecards.c: In function 'mlxsw_linecard_types_init.isra':
>> drivers/net/ethernet/mellanox/mlxsw/core_linecards.c:776:9: warning: '.bin' directive output may be truncated writing 4 bytes into a region of size between 3 and 11 [-Wformat-truncation=]
     776 |         "mellanox/lc_ini_bundle_%u_%u.bin"
         |         ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
   drivers/net/ethernet/mellanox/mlxsw/core_linecards.c:790:24: note: in expansion of macro 'MLXSW_LINECARDS_INI_BUNDLE_FILENAME_FMT'
     790 |                        MLXSW_LINECARDS_INI_BUNDLE_FILENAME_FMT,
         |                        ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
   drivers/net/ethernet/mellanox/mlxsw/core_linecards.c:776:38: note: format string is defined here
     776 |         "mellanox/lc_ini_bundle_%u_%u.bin"
         |                                      ^~~~
   drivers/net/ethernet/mellanox/mlxsw/core_linecards.c:789:15: note: 'snprintf' output between 31 and 39 bytes into a destination of size 37
     789 |         err = snprintf(filename, sizeof(filename),
         |               ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
     790 |                        MLXSW_LINECARDS_INI_BUNDLE_FILENAME_FMT,
         |                        ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
     791 |                        rev->minor, rev->subminor);
         |                        ~~~~~~~~~~~~~~~~~~~~~~~~~~


vim +776 drivers/net/ethernet/mellanox/mlxsw/core_linecards.c

   774	
   775	#define MLXSW_LINECARDS_INI_BUNDLE_FILENAME_FMT \
 > 776		"mellanox/lc_ini_bundle_%u_%u.bin"
   777	#define MLXSW_LINECARDS_INI_BUNDLE_FILENAME_LEN \
   778		(sizeof(MLXSW_LINECARDS_INI_BUNDLE_FILENAME_FMT) + 4)
   779	

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