linux-kernel - drivers/net/ethernet/hisilicon/hns3/hns3_debugfs.c:127:4: warning: 'strncpy' output truncated before terminating nul copying as many bytes from a string as its length

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Date:   Tue, 4 Jan 2022 20:02:30 +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:127:4: warning:
 'strncpy' output truncated before terminating nul copying as many bytes from
 a string as its length

tree:   https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git master
head:   c9e6606c7fe92b50a02ce51dda82586ebdf99b48
commit: 77e9184869c9fb00a482357ea8eef3bd7ae3d45a net: hns3: refactor dump bd info of debugfs
date:   8 months ago
config: x86_64-buildonly-randconfig-r006-20220103 (https://download.01.org/0day-ci/archive/20220104/202201041959.jwL02W69-lkp@intel.com/config)
compiler: gcc-9 (Debian 9.3.0-22) 9.3.0
reproduce (this is a W=1 build):
        # 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 to linux build tree
        mkdir build_dir
        make W=1 O=build_dir ARCH=x86_64 SHELL=/bin/bash drivers/net/ethernet/hisilicon/hns3/

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/hns3_debugfs.c: In function 'hns3_dbg_fill_content.constprop':
>> drivers/net/ethernet/hisilicon/hns3/hns3_debugfs.c:127:4: warning: 'strncpy' output truncated before terminating nul copying as many bytes from a string as its length [-Wstringop-truncation]
     127 |    strncpy(pos, items[i].name, strlen(items[i].name));
         |    ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
   drivers/net/ethernet/hisilicon/hns3/hns3_debugfs.c:125:4: warning: 'strncpy' output truncated before terminating nul copying as many bytes from a string as its length [-Wstringop-truncation]
     125 |    strncpy(pos, result[i], strlen(result[i]));
         |    ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~


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	

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