Hi Qiu-ji, kernel test robot noticed the following build warnings: [auto build test WARNING on linus/master] [also build test WARNING on v6.13-rc7 next-20250117] [If your patch is applied to the wrong git tree, kindly drop us a note. And when submitting patch, we suggest to use '--base' as documented in https://git-scm.com/docs/git-format-patch#_base_tree_information] url: https://github.com/intel-lab-lkp/linux/commits/Qiu-ji-Chen/cdx-Fix-possible-UAF-error-in-driver_override_show/20250115-170808 base: linus/master patch link: https://lore.kernel.org/r/20250115090449.102060-1-chenqiuji666%40gmail.com patch subject: [PATCH v3] cdx: Fix possible UAF error in driver_override_show() config: arm64-randconfig-002-20250116 (https://download.01.org/0day-ci/archive/20250118/202501180932.8MILoqSq-lkp@xxxxxxxxx/config) compiler: aarch64-linux-gcc (GCC) 14.2.0 reproduce (this is a W=1 build): (https://download.01.org/0day-ci/archive/20250118/202501180932.8MILoqSq-lkp@xxxxxxxxx/reproduce) If you fix the issue in a separate patch/commit (i.e. not just a new version of the same patch/commit), kindly add following tags | Reported-by: kernel test robot <lkp@xxxxxxxxx> | Closes: https://lore.kernel.org/oe-kbuild-all/202501180932.8MILoqSq-lkp@xxxxxxxxx/ All warnings (new ones prefixed by >>): drivers/cdx/cdx.c: In function 'driver_override_show': >> drivers/cdx/cdx.c:473:17: warning: variable 'len' set but not used [-Wunused-but-set-variable] 473 | ssize_t len; | ^~~ >> drivers/cdx/cdx.c:478:1: warning: no return statement in function returning non-void [-Wreturn-type] 478 | } | ^ vim +/len +473 drivers/cdx/cdx.c 468 469 static ssize_t driver_override_show(struct device *dev, 470 struct device_attribute *attr, char *buf) 471 { 472 struct cdx_device *cdx_dev = to_cdx_device(dev); > 473 ssize_t len; 474 475 device_lock(dev); 476 len = sysfs_emit(buf, "%s\n", cdx_dev->driver_override); 477 device_unlock(dev); > 478 } 479 static DEVICE_ATTR_RW(driver_override); 480 -- 0-DAY CI Kernel Test Service https://github.com/intel/lkp-tests/wiki
