linux-kernel - drivers/net/ethernet/hisilicon/hns3/hns3_debugfs.c:127:25: warning: 'strncpy' specified bound depends on the length of the source argument

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Date:   Wed, 6 Jul 2022 18:12:52 +0800
From:   kernel test robot <lkp@...el.com>
To:     Huazhong Tan <tanhuazhong@...wei.com>
Cc:     kbuild-all@...ts.01.org, linux-kernel@...r.kernel.org
Subject: drivers/net/ethernet/hisilicon/hns3/hns3_debugfs.c:127:25: warning:
 'strncpy' specified bound depends on the length of the source argument

Hi Huazhong,

FYI, the error/warning still remains.

tree:   https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git master
head:   e35e5b6f695d241ffb1d223207da58a1fbcdff4b
commit: 77e9184869c9fb00a482357ea8eef3bd7ae3d45a net: hns3: refactor dump bd info of debugfs
date:   1 year, 2 months ago
config: alpha-allyesconfig (https://download.01.org/0day-ci/archive/20220706/202207061829.J89nFLKY-lkp@intel.com/config)
compiler: alpha-linux-gcc (GCC) 11.3.0
reproduce (this is a W=1 build):
        wget https://raw.githubusercontent.com/intel/lkp-tests/master/sbin/make.cross -O ~/bin/make.cross
        chmod +x ~/bin/make.cross
        # https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?id=77e9184869c9fb00a482357ea8eef3bd7ae3d45a
        git remote add linus https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
        git fetch --no-tags linus master
        git checkout 77e9184869c9fb00a482357ea8eef3bd7ae3d45a
        # save the config file
        mkdir build_dir && cp config build_dir/.config
        COMPILER_INSTALL_PATH=$HOME/0day COMPILER=gcc-11.3.0 make.cross W=1 O=build_dir ARCH=alpha SHELL=/bin/bash drivers/gpio/ drivers/net/ethernet/hisilicon/hns3/ drivers/net/netdevsim/ drivers/tty/serial/ sound/soc/intel/

If you fix the issue, kindly add following tag where applicable
Reported-by: kernel test robot <lkp@...el.com>

All warnings (new ones prefixed by >>):

   drivers/net/ethernet/hisilicon/hns3/hns3_debugfs.c: In function 'hns3_dbg_fill_content.constprop':
>> drivers/net/ethernet/hisilicon/hns3/hns3_debugfs.c:127:25: warning: 'strncpy' specified bound depends on the length of the source argument [-Wstringop-truncation]
     127 |                         strncpy(pos, items[i].name, strlen(items[i].name));
         |                         ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
   drivers/net/ethernet/hisilicon/hns3/hns3_debugfs.c:125:25: warning: 'strncpy' specified bound depends on the length of the source argument [-Wstringop-truncation]
     125 |                         strncpy(pos, result[i], strlen(result[i]));
         |                         ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
   In function 'hns3_dbg_fill_content',
       inlined from 'hns3_dbg_tx_bd_info' at drivers/net/ethernet/hisilicon/hns3/hns3_debugfs.c:432:2:
>> drivers/net/ethernet/hisilicon/hns3/hns3_debugfs.c:127:25: warning: 'strncpy' specified bound depends on the length of the source argument [-Wstringop-truncation]
     127 |                         strncpy(pos, items[i].name, strlen(items[i].name));
         |                         ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
   In function 'hns3_dbg_fill_content',
       inlined from 'hns3_dbg_rx_bd_info' at drivers/net/ethernet/hisilicon/hns3/hns3_debugfs.c:358:2:
>> drivers/net/ethernet/hisilicon/hns3/hns3_debugfs.c:127:25: warning: 'strncpy' specified bound depends on the length of the source argument [-Wstringop-truncation]
     127 |                         strncpy(pos, items[i].name, strlen(items[i].name));
         |                         ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~


vim +/strncpy +127 drivers/net/ethernet/hisilicon/hns3/hns3_debugfs.c

   114	
   115	static void hns3_dbg_fill_content(char *content, u16 len,
   116					  const struct hns3_dbg_item *items,
   117					  const char **result, u16 size)
   118	{
   119		char *pos = content;
   120		u16 i;
   121	
   122		memset(content, ' ', len);
   123		for (i = 0; i < size; i++) {
   124			if (result)
   125				strncpy(pos, result[i], strlen(result[i]));
   126			else
 > 127				strncpy(pos, items[i].name, strlen(items[i].name));
   128	
   129			pos += strlen(items[i].name) + items[i].interval;
   130		}
   131	
   132		*pos++ = '\n';
   133		*pos++ = '\0';
   134	}
   135	

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https://01.org/lkp