linux-kernel - drivers/net/ethernet/hisilicon/hns3/hns3pf/hclge_debugfs.c:90:4: warning: 'strncpy' output truncated before terminating nul copying as many bytes from a string as its length

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Message-ID: <202107091439.vP9CncNw-lkp@intel.com>
Date:   Fri, 9 Jul 2021 14:51:46 +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/hns3pf/hclge_debugfs.c:90:4:
 warning: 'strncpy' output truncated before terminating nul copying as many
 bytes from a string as its length

Hi Huazhong,

FYI, the error/warning still remains.

tree:   https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git master
head:   f55966571d5eb2876a11e48e798b4592fa1ffbb7
commit: 1556ea9120ffcf4faf7ac6b62a6e28216f260a23 net: hns3: refactor dump mac list of debugfs
date:   8 weeks ago
config: alpha-buildonly-randconfig-r003-20210709 (attached as .config)
compiler: alpha-linux-gcc (GCC) 9.3.0
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=1556ea9120ffcf4faf7ac6b62a6e28216f260a23
        git remote add linus https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
        git fetch --no-tags linus master
        git checkout 1556ea9120ffcf4faf7ac6b62a6e28216f260a23
        # save the attached .config to linux build tree
        COMPILER_INSTALL_PATH=$HOME/0day COMPILER=gcc-9.3.0 make.cross ARCH=alpha 

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

All warnings (new ones prefixed by >>):

   drivers/net/ethernet/hisilicon/hns3/hns3pf/hclge_debugfs.c: In function 'hclge_dbg_fill_content.constprop':
>> drivers/net/ethernet/hisilicon/hns3/hns3pf/hclge_debugfs.c:90:4: warning: 'strncpy' output truncated before terminating nul copying as many bytes from a string as its length [-Wstringop-truncation]
      90 |    strncpy(pos, items[i].name, strlen(items[i].name));
         |    ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
   drivers/net/ethernet/hisilicon/hns3/hns3pf/hclge_debugfs.c:88:4: warning: 'strncpy' output truncated before terminating nul copying as many bytes from a string as its length [-Wstringop-truncation]
      88 |    strncpy(pos, result[i], strlen(result[i]));
         |    ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~


vim +/strncpy +90 drivers/net/ethernet/hisilicon/hns3/hns3pf/hclge_debugfs.c

    77	
    78	static void hclge_dbg_fill_content(char *content, u16 len,
    79					   const struct hclge_dbg_item *items,
    80					   const char **result, u16 size)
    81	{
    82		char *pos = content;
    83		u16 i;
    84	
    85		memset(content, ' ', len);
    86		for (i = 0; i < size; i++) {
    87			if (result)
    88				strncpy(pos, result[i], strlen(result[i]));
    89			else
  > 90				strncpy(pos, items[i].name, strlen(items[i].name));
    91			pos += strlen(items[i].name) + items[i].interval;
    92		}
    93		*pos++ = '\n';
    94		*pos++ = '\0';
    95	}
    96	

---
0-DAY CI Kernel Test Service, Intel Corporation
https://lists.01.org/hyperkitty/list/kbuild-all@lists.01.org

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