linux-kernel - <command-line>: warning: '_ttyVK' directive output may be truncated writing 6 bytes into a region of size between 3 and 12

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Date: Sun, 7 Jan 2024 10:41:28 +0800
From: kernel test robot <lkp@...el.com>
To: Scott Branden <scott.branden@...adcom.com>
Cc: oe-kbuild-all@...ts.linux.dev, linux-kernel@...r.kernel.org
Subject: <command-line>: warning: '_ttyVK' directive output may be truncated
 writing 6 bytes into a region of size between 3 and 12

tree:   https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git master
head:   52b1853b080a082ec3749c3a9577f6c71b1d4a90
commit: 91ca10d6fa0720e35596c720e494d9c18624418a misc: bcm-vk: add ttyVK support
date:   2 years, 11 months ago
config: x86_64-randconfig-004-20240105 (https://download.01.org/0day-ci/archive/20240107/202401071057.z8QE4au9-lkp@intel.com/config)
compiler: gcc-9 (Debian 9.3.0-22) 9.3.0
reproduce (this is a W=1 build): (https://download.01.org/0day-ci/archive/20240107/202401071057.z8QE4au9-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/202401071057.z8QE4au9-lkp@intel.com/

All warnings (new ones prefixed by >>):

   drivers/misc/bcm-vk/bcm_vk_dev.c: In function 'bcm_vk_probe':
>> <command-line>: warning: '_ttyVK' directive output may be truncated writing 6 bytes into a region of size between 3 and 12 [-Wformat-truncation=]
   drivers/misc/bcm-vk/bcm_vk_dev.c:1454:31: note: in expansion of macro 'KBUILD_MODNAME'
    1454 |  snprintf(name, sizeof(name), KBUILD_MODNAME ".%d_ttyVK", id);
         |                               ^~~~~~~~~~~~~~
   drivers/misc/bcm-vk/bcm_vk_dev.c:1454:2: note: 'snprintf' output between 15 and 24 bytes into a destination of size 20
    1454 |  snprintf(name, sizeof(name), KBUILD_MODNAME ".%d_ttyVK", id);
         |  ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~

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