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

From: kernel test robot
Date: Fri Jul 09 2021 - 01:45:30 EST


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: 77e9184869c9fb00a482357ea8eef3bd7ae3d45a net: hns3: refactor dump bd info 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=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 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@xxxxxxxxx>

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@xxxxxxxxxxxx

Attachment: .config.gz
Description: application/gzip