drivers/message/fusion/mptctl.c:1492:9: warning: 'strncpy' output may be truncated copying 31 bytes from a string of length 31

kernel test robot
2022-04-05T05:01:10Z

head: 3123109284176b1532874591f7c81f3837bbdc17
commit: dd03762ab608e058c8f390ad9cf667e490089796 arm64: Enable KCSAN
date: 4 months ago
config: arm64-randconfig-r002-20220405 (https://download.01.org/0day-ci/archive/20220405/202204051248.mIuzvPFX-lkp@intel.com/config)
compiler: aarch64-linux-gcc (GCC) 11.2.0
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=dd03762ab608e058c8f390ad9cf667e490089796
git remote add linus https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
git fetch --no-tags linus master
git checkout dd03762ab608e058c8f390ad9cf667e490089796
# save the config file to linux build tree
mkdir build_dir
COMPILER_INSTALL_PATH=$HOME/0day COMPILER=gcc-11.2.0 make.cross O=build_dir ARCH=arm64 SHELL=/bin/bash drivers/message/fusion/

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

All warnings (new ones prefixed by >>):

drivers/message/fusion/mptctl.c: In function 'mptctl_do_mpt_command':
drivers/message/fusion/mptctl.c:1823:27: warning: variable 'config_frame' set but not used [-Wunused-but-set-variable]
1823 | Config_t *config_frame;
| ^~~~~~~~~~~~
drivers/message/fusion/mptctl.c:2003:34: warning: variable 'pScsiTm' set but not used [-Wunused-but-set-variable]
2003 | SCSITaskMgmt_t *pScsiTm;
| ^~~~~~~
drivers/message/fusion/mptctl.c: In function 'mptctl_hp_hostinfo':
drivers/message/fusion/mptctl.c:2329:33: warning: variable 'retval' set but not used [-Wunused-but-set-variable]
2329 | int retval;
| ^~~~~~
drivers/message/fusion/mptctl.c: In function 'mptctl_readtest':
>> drivers/message/fusion/mptctl.c:1492:9: warning: 'strncpy' output may be truncated copying 31 bytes from a string of length 31 [-Wstringop-truncation]
1492 | strncpy (karg.name, ioc->name, MPT_MAX_NAME);
| ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~

vim +/strncpy +1492 drivers/message/fusion/mptctl.c

^1da177e4c3f41 Linus Torvalds 2005-04-16 1459
^1da177e4c3f41 Linus Torvalds 2005-04-16 1460 /*=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=*/
^1da177e4c3f41 Linus Torvalds 2005-04-16 1461 /* MPT IOCTL Test function.
^1da177e4c3f41 Linus Torvalds 2005-04-16 1462 *
^1da177e4c3f41 Linus Torvalds 2005-04-16 1463 * Outputs: None.
^1da177e4c3f41 Linus Torvalds 2005-04-16 1464 * Return: 0 if successful
^1da177e4c3f41 Linus Torvalds 2005-04-16 1465 * -EFAULT if data unavailable
^1da177e4c3f41 Linus Torvalds 2005-04-16 1466 * -ENODEV if no such device/adapter
^1da177e4c3f41 Linus Torvalds 2005-04-16 1467 */
^1da177e4c3f41 Linus Torvalds 2005-04-16 1468 static int
28d76df18f0ad5 Dan Carpenter 2020-01-14 1469 mptctl_readtest (MPT_ADAPTER *ioc, unsigned long arg)
^1da177e4c3f41 Linus Torvalds 2005-04-16 1470 {
^1da177e4c3f41 Linus Torvalds 2005-04-16 1471 struct mpt_ioctl_test __user *uarg = (void __user *) arg;
^1da177e4c3f41 Linus Torvalds 2005-04-16 1472 struct mpt_ioctl_test karg;
^1da177e4c3f41 Linus Torvalds 2005-04-16 1473
^1da177e4c3f41 Linus Torvalds 2005-04-16 1474 if (copy_from_user(&karg, uarg, sizeof(struct mpt_ioctl_test))) {
29dd3609f2fc70 Eric Moore 2007-09-14 1475 printk(KERN_ERR MYNAM "%s@%d::mptctl_readtest - "
^1da177e4c3f41 Linus Torvalds 2005-04-16 1476 "Unable to read in mpt_ioctl_test struct @ %p\n",
^1da177e4c3f41 Linus Torvalds 2005-04-16 1477 __FILE__, __LINE__, uarg);
^1da177e4c3f41 Linus Torvalds 2005-04-16 1478 return -EFAULT;
^1da177e4c3f41 Linus Torvalds 2005-04-16 1479 }
^1da177e4c3f41 Linus Torvalds 2005-04-16 1480
09120a8cd38dbd Prakash, Sathya 2007-07-24 1481 dctlprintk(ioc, printk(MYIOC_s_DEBUG_FMT "mptctl_readtest called.\n",
09120a8cd38dbd Prakash, Sathya 2007-07-24 1482 ioc->name));
^1da177e4c3f41 Linus Torvalds 2005-04-16 1483 /* Fill in the data and return the structure to the calling
^1da177e4c3f41 Linus Torvalds 2005-04-16 1484 * program
^1da177e4c3f41 Linus Torvalds 2005-04-16 1485 */
^1da177e4c3f41 Linus Torvalds 2005-04-16 1486
^1da177e4c3f41 Linus Torvalds 2005-04-16 1487 #ifdef MFCNT
^1da177e4c3f41 Linus Torvalds 2005-04-16 1488 karg.chip_type = ioc->mfcnt;
^1da177e4c3f41 Linus Torvalds 2005-04-16 1489 #else
^1da177e4c3f41 Linus Torvalds 2005-04-16 1490 karg.chip_type = ioc->pcidev->device;
^1da177e4c3f41 Linus Torvalds 2005-04-16 1491 #endif
^1da177e4c3f41 Linus Torvalds 2005-04-16 @1492 strncpy (karg.name, ioc->name, MPT_MAX_NAME);
^1da177e4c3f41 Linus Torvalds 2005-04-16 1493 karg.name[MPT_MAX_NAME-1]='\0';
^1da177e4c3f41 Linus Torvalds 2005-04-16 1494 strncpy (karg.product, ioc->prod_name, MPT_PRODUCT_LENGTH);
^1da177e4c3f41 Linus Torvalds 2005-04-16 1495 karg.product[MPT_PRODUCT_LENGTH-1]='\0';
^1da177e4c3f41 Linus Torvalds 2005-04-16 1496
^1da177e4c3f41 Linus Torvalds 2005-04-16 1497 /* Copy the data from kernel memory to user memory
^1da177e4c3f41 Linus Torvalds 2005-04-16 1498 */
^1da177e4c3f41 Linus Torvalds 2005-04-16 1499 if (copy_to_user((char __user *)arg, &karg, sizeof(struct mpt_ioctl_test))) {
29dd3609f2fc70 Eric Moore 2007-09-14 1500 printk(MYIOC_s_ERR_FMT "%s@%d::mptctl_readtest - "
^1da177e4c3f41 Linus Torvalds 2005-04-16 1501 "Unable to write out mpt_ioctl_test struct @ %p\n",
29dd3609f2fc70 Eric Moore 2007-09-14 1502 ioc->name, __FILE__, __LINE__, uarg);
^1da177e4c3f41 Linus Torvalds 2005-04-16 1503 return -EFAULT;
^1da177e4c3f41 Linus Torvalds 2005-04-16 1504 }
^1da177e4c3f41 Linus Torvalds 2005-04-16 1505
^1da177e4c3f41 Linus Torvalds 2005-04-16 1506 return 0;
^1da177e4c3f41 Linus Torvalds 2005-04-16 1507 }
^1da177e4c3f41 Linus Torvalds 2005-04-16 1508