linux-kernel - drivers/misc/xilinx_sdfec.c:92:57: warning: '%d' directive output may be truncated writing between 1 and 10 bytes into a region of size 6

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Date: Tue, 26 Dec 2023 13:56:23 +0800
From: kernel test robot <lkp@...el.com>
To: Dragan Cvetic <dragan.cvetic@...inx.com>
Cc: oe-kbuild-all@...ts.linux.dev, linux-kernel@...r.kernel.org,
	Derek Kiernan <derek.kiernan@...inx.com>
Subject: drivers/misc/xilinx_sdfec.c:92:57: warning: '%d' directive output
 may be truncated writing between 1 and 10 bytes into a region of size 6

tree:   https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git master
head:   fbafc3e621c3f4ded43720fdb1d6ce1728ec664e
commit: 76d83e1c32334a793e50de6f955c2eefcc60bb8e misc: xilinx-sdfec: add core driver
date:   4 years, 6 months ago
config: sparc64-randconfig-r025-20230806 (https://download.01.org/0day-ci/archive/20231226/202312261345.5icSobz6-lkp@intel.com/config)
compiler: sparc64-linux-gcc (GCC) 12.3.0
reproduce: (https://download.01.org/0day-ci/archive/20231226/202312261345.5icSobz6-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/202312261345.5icSobz6-lkp@intel.com/

All warnings (new ones prefixed by >>):

   drivers/misc/xilinx_sdfec.c: In function 'xsdfec_probe':
>> drivers/misc/xilinx_sdfec.c:92:57: warning: '%d' directive output may be truncated writing between 1 and 10 bytes into a region of size 6 [-Wformat-truncation=]
      92 |         snprintf(xsdfec->dev_name, DEV_NAME_LEN, "xsdfec%d", xsdfec->dev_id);
         |                                                         ^~
   drivers/misc/xilinx_sdfec.c:92:50: note: directive argument in the range [0, 2147483647]
      92 |         snprintf(xsdfec->dev_name, DEV_NAME_LEN, "xsdfec%d", xsdfec->dev_id);
         |                                                  ^~~~~~~~~~
   drivers/misc/xilinx_sdfec.c:92:9: note: 'snprintf' output between 8 and 17 bytes into a destination of size 12
      92 |         snprintf(xsdfec->dev_name, DEV_NAME_LEN, "xsdfec%d", xsdfec->dev_id);
         |         ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~

Kconfig warnings: (for reference only)
   WARNING: unmet direct dependencies detected for COMPAT_BINFMT_ELF
   Depends on [n]: COMPAT [=y] && BINFMT_ELF [=n]
   Selected by [y]:
   - COMPAT [=y] && SPARC64 [=y]


vim +92 drivers/misc/xilinx_sdfec.c

    59	
    60	static int xsdfec_probe(struct platform_device *pdev)
    61	{
    62		struct xsdfec_dev *xsdfec;
    63		struct device *dev;
    64		struct resource *res;
    65		int err;
    66	
    67		xsdfec = devm_kzalloc(&pdev->dev, sizeof(*xsdfec), GFP_KERNEL);
    68		if (!xsdfec)
    69			return -ENOMEM;
    70	
    71		xsdfec->dev = &pdev->dev;
    72		spin_lock_init(&xsdfec->error_data_lock);
    73	
    74		dev = xsdfec->dev;
    75		res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
    76		xsdfec->regs = devm_ioremap_resource(dev, res);
    77		if (IS_ERR(xsdfec->regs)) {
    78			err = PTR_ERR(xsdfec->regs);
    79			return err;
    80		}
    81	
    82		/* Save driver private data */
    83		platform_set_drvdata(pdev, xsdfec);
    84	
    85		mutex_lock(&dev_idr_lock);
    86		err = idr_alloc(&dev_idr, xsdfec->dev_name, 0, 0, GFP_KERNEL);
    87		mutex_unlock(&dev_idr_lock);
    88		if (err < 0)
    89			goto err_xsddev_idr;
    90		xsdfec->dev_id = err;
    91	
  > 92		snprintf(xsdfec->dev_name, DEV_NAME_LEN, "xsdfec%d", xsdfec->dev_id);
    93		xsdfec->miscdev.minor = MISC_DYNAMIC_MINOR;
    94		xsdfec->miscdev.name = xsdfec->dev_name;
    95		xsdfec->miscdev.fops = &xsdfec_fops;
    96		xsdfec->miscdev.parent = dev;
    97		err = misc_register(&xsdfec->miscdev);
    98		if (err) {
    99			dev_err(dev, "error:%d. Unable to register device", err);
   100			return err;
   101		}
   102		return 0;
   103	
   104	err_xsddev_idr:
   105		xsdfec_idr_remove(xsdfec);
   106	
   107		return err;
   108	}
   109	

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