Hi Marc, url: https://github.com/0day-ci/linux/commits/Marc-Kleine-Budde/MAINTAINERS-ad... base: f50e2f9f791647aa4e5b19d0064f5cabf630bf6e config: i386-randconfig-m021-20210114 (attached as .config) compiler: gcc-9 (Debian 9.3.0-15) 9.3.0 If you fix the issue, kindly add following tag as appropriate Reported-by: kernel test robot <lkp(a)intel.com&gt; Reported-by: Dan Carpenter <dan.carpenter(a)oracle.com&gt; smatch warnings: drivers/net/can/dev/length.c:38 can_fd_len2dlc() error: buffer overflow 'len2dlc' 49 <= 49 vim +/len2dlc +38 drivers/net/can/dev/length.c d4b90befe4bfafa1 Marc Kleine-Budde 2021-01-13 32 /* map the sanitized data length to an appropriate data length code */ d4b90befe4bfafa1 Marc Kleine-Budde 2021-01-13 33 u8 can_fd_len2dlc(u8 len) d4b90befe4bfafa1 Marc Kleine-Budde 2021-01-13 34 { 6ae761ad6c0557f0 Marc Kleine-Budde 2021-01-13 35 if (len > ARRAY_SIZE(len2dlc)) ^ This should be >= 6ae761ad6c0557f0 Marc Kleine-Budde 2021-01-13 36 return CANFD_MAX_DLC; d4b90befe4bfafa1 Marc Kleine-Budde 2021-01-13 37 d4b90befe4bfafa1 Marc Kleine-Budde 2021-01-13 @38 return len2dlc[len]; --- 0-DAY CI Kernel Test Service, Intel Corporation https://lists.01.org/hyperkitty/list/kbuild-all@lists.01.org