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-004-20250116 (https://download.01.org/0day-ci/archive/20250118/202501180719.sDmtGnhD-lkp@xxxxxxxxx/config) compiler: clang version 20.0.0git (https://github.com/llvm/llvm-project f5cd181ffbb7cb61d582fe130d46580d5969d47a) reproduce (this is a W=1 build): (https://download.01.org/0day-ci/archive/20250118/202501180719.sDmtGnhD-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/202501180719.sDmtGnhD-lkp@xxxxxxxxx/ All warnings (new ones prefixed by >>): drivers/cdx/cdx.c:473:10: warning: variable 'len' set but not used [-Wunused-but-set-variable] 473 | ssize_t len; | ^ >> drivers/cdx/cdx.c:478:1: warning: non-void function does not return a value [-Wreturn-type] 478 | } | ^ 2 warnings generated. vim +478 drivers/cdx/cdx.c 48a6c7bced2a78 Nipun Gupta 2023-03-13 468 48a6c7bced2a78 Nipun Gupta 2023-03-13 469 static ssize_t driver_override_show(struct device *dev, 48a6c7bced2a78 Nipun Gupta 2023-03-13 470 struct device_attribute *attr, char *buf) 48a6c7bced2a78 Nipun Gupta 2023-03-13 471 { 48a6c7bced2a78 Nipun Gupta 2023-03-13 472 struct cdx_device *cdx_dev = to_cdx_device(dev); 4228bb0224f83f Qiu-ji Chen 2025-01-15 473 ssize_t len; 48a6c7bced2a78 Nipun Gupta 2023-03-13 474 4228bb0224f83f Qiu-ji Chen 2025-01-15 475 device_lock(dev); 4228bb0224f83f Qiu-ji Chen 2025-01-15 476 len = sysfs_emit(buf, "%s\n", cdx_dev->driver_override); 4228bb0224f83f Qiu-ji Chen 2025-01-15 477 device_unlock(dev); 48a6c7bced2a78 Nipun Gupta 2023-03-13 @478 } 48a6c7bced2a78 Nipun Gupta 2023-03-13 479 static DEVICE_ATTR_RW(driver_override); 48a6c7bced2a78 Nipun Gupta 2023-03-13 480 -- 0-DAY CI Kernel Test Service https://github.com/intel/lkp-tests/wiki
