[kbuild-all] [linux-next:master 12280/13751] fs/dlm/debug_fs.c:654:15: error: 'sscanf' may overflow; destination buffer in argument 4 has size 64, but the corresponding specifier may require size 65

tree: https://git.kernel.org/pub/scm/linux/kernel/git/next/linux-next.git master head: f2e19fd15bd7cba347ce50be71955f5cd28a6019 commit: 5054e79de99984b4f39a073534526bc7c827b1e0 [12280/13751] fs: dlm: add lkb debugfs functionality config: hexagon-buildonly-randconfig-r006-20211112 (attached as .config) compiler: clang version 14.0.0 (https://github.com/llvm/llvm-project 63ef0e17e28827eae53133b3467bdac7d9729318) 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/next/linux-next.git/commi... git remote add linux-next https://git.kernel.org/pub/scm/linux/kernel/git/next/linux-next.git git fetch --no-tags linux-next master git checkout 5054e79de99984b4f39a073534526bc7c827b1e0 # save the attached .config to linux build tree COMPILER_INSTALL_PATH=$HOME/0day COMPILER=clang make.cross W=1 ARCH=hexagon If you fix the issue, kindly add following tag as appropriate Reported-by: kernel test robot <lkp(a)intel.com&gt; All errors (new ones prefixed by >>): &lkb_id, name, &lkb_flags, &lkb_nodeid, &lkb_status); ^ 1 error generated. vim +/sscanf +654 fs/dlm/debug_fs.c 637 638 static ssize_t table_write2(struct file *file, const char __user *user_buf, 639 size_t count, loff_t *ppos) 640 { 641 struct seq_file *seq = file->private_data; 642 int n, len, lkb_nodeid, lkb_status, error; 643 char name[DLM_RESNAME_MAXLEN] = {}; 644 struct dlm_ls *ls = seq->private; 645 unsigned int lkb_flags; 646 char buf[256] = {}; 647 uint32_t lkb_id; 648 649 if (copy_from_user(buf, user_buf, 650 min_t(size_t, sizeof(buf) - 1, count))) 651 return -EFAULT; 652 653 n = sscanf(buf, "%x %" __stringify(DLM_RESNAME_MAXLEN) "s %x %d %d", 655 if (n != 5) 656 return -EINVAL; 657 658 len = strnlen(name, DLM_RESNAME_MAXLEN); 659 error = dlm_debug_add_lkb(ls, lkb_id, name, len, lkb_flags, 660 lkb_nodeid, lkb_status); 661 if (error) 662 return error; 663 664 return count; 665 } 666 --- 0-DAY CI Kernel Test Service, Intel Corporation https://lists.01.org/hyperkitty/list/kbuild-all@lists.01.org