linux-kernel - drivers/misc/dw-xdata-pcie.c:20:41: warning: 'snprintf' output may be truncated before the last format character

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Date: Sun, 7 Jan 2024 05:22:37 +0800
From: kernel test robot <lkp@...el.com>
To: Gustavo Pimentel <Gustavo.Pimentel@...opsys.com>
Cc: oe-kbuild-all@...ts.linux.dev, linux-kernel@...r.kernel.org
Subject: drivers/misc/dw-xdata-pcie.c:20:41: warning: 'snprintf' output may
 be truncated before the last format character

tree:   https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git master
head:   95c8a35f1c017327eab3b6a2ff5c04255737c856
commit: e8a30eef6ef6da4998fcdaaffaaf8d29777c5d7d misc: Add Synopsys DesignWare xData IP driver
date:   2 years, 9 months ago
config: x86_64-randconfig-001-20240105 (https://download.01.org/0day-ci/archive/20240107/202401070541.9jGvpTOU-lkp@intel.com/config)
compiler: gcc-12 (Debian 12.2.0-14) 12.2.0
reproduce (this is a W=1 build): (https://download.01.org/0day-ci/archive/20240107/202401070541.9jGvpTOU-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/202401070541.9jGvpTOU-lkp@intel.com/

All warnings (new ones prefixed by >>):

   drivers/misc/dw-xdata-pcie.c: In function 'dw_xdata_pcie_probe':
>> drivers/misc/dw-xdata-pcie.c:20:41: warning: 'snprintf' output may be truncated before the last format character [-Wformat-truncation=]
      20 | #define DW_XDATA_DRIVER_NAME            "dw-xdata-pcie"
         |                                         ^~~~~~~~~~~~~~~
   drivers/misc/dw-xdata-pcie.c:342:38: note: in expansion of macro 'DW_XDATA_DRIVER_NAME'
     342 |         snprintf(name, sizeof(name), DW_XDATA_DRIVER_NAME ".%d", id);
         |                                      ^~~~~~~~~~~~~~~~~~~~
   drivers/misc/dw-xdata-pcie.c:390:64: note: format string is defined here
     390 |         if (sscanf(dw->misc_dev.name, DW_XDATA_DRIVER_NAME ".%d", &id) != 1)
         |                                                                ^
   drivers/misc/dw-xdata-pcie.c:342:9: note: 'snprintf' output between 16 and 25 bytes into a destination of size 24
     342 |         snprintf(name, sizeof(name), DW_XDATA_DRIVER_NAME ".%d", id);
         |         ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~


vim +/snprintf +20 drivers/misc/dw-xdata-pcie.c

    19	
  > 20	#define DW_XDATA_DRIVER_NAME		"dw-xdata-pcie"
    21	

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