Hi, url: https://github.com/0day-ci/linux/commits/james-liu-hpe-com/ACPI-OSL-Handle-the-return-value-of-acpi_os_map_generic_address-for-a-non-register-GAS/20211022-091959 base: https://git.kernel.org/pub/scm/linux/kernel/git/rafael/linux-pm.git linux-next config: i386-randconfig-m021-20211025 (attached as .config) compiler: gcc-9 (Debian 9.3.0-22) 9.3.0 If you fix the issue, kindly add following tag as appropriate Reported-by: kernel test robot <lkp@xxxxxxxxx> Reported-by: Dan Carpenter <dan.carpenter@xxxxxxxxxx> smatch warnings: drivers/acpi/osl.c:467 acpi_os_map_generic_address() error: uninitialized symbol 'addr'. vim +/addr +467 drivers/acpi/osl.c 6915564dc5a8ab Rafael J. Wysocki 2020-09-11 453 void __iomem *acpi_os_map_generic_address(struct acpi_generic_address *gas) 29718521237a1b Myron Stowe 2010-10-21 454 { bc9ffce27962c0 Myron Stowe 2011-11-07 455 u64 addr; 29718521237a1b Myron Stowe 2010-10-21 456 bc9ffce27962c0 Myron Stowe 2011-11-07 457 if (gas->space_id != ACPI_ADR_SPACE_SYSTEM_MEMORY) 6915564dc5a8ab Rafael J. Wysocki 2020-09-11 458 return NULL; f0340367a7885a James Liu 2021-10-22 459 /* Handle a non-register GAS (i.e., a pointer to a data structure), f0340367a7885a James Liu 2021-10-22 460 * whose bit width is expected to be 0 according to ACPI spec. 6.4. f0340367a7885a James Liu 2021-10-22 461 * For example, The RegisterRegion field in SET_ERROR_TYPE_WITH_ADDRESS f0340367a7885a James Liu 2021-10-22 462 * points to a data structure whose format is defined in Table 18.30 in f0340367a7885a James Liu 2021-10-22 463 * ACPI Spec. 6.4 f0340367a7885a James Liu 2021-10-22 464 */ f0340367a7885a James Liu 2021-10-22 465 if (!gas->bit_width) { f0340367a7885a James Liu 2021-10-22 466 pr_info("Mapping IOMEM for a non-register GAS.\n"); f0340367a7885a James Liu 2021-10-22 @467 return acpi_os_map_iomem(addr, sizeof(unsigned long long)); ^ ^^^^ Uninitialized. f0340367a7885a James Liu 2021-10-22 468 } 29718521237a1b Myron Stowe 2010-10-21 469 bc9ffce27962c0 Myron Stowe 2011-11-07 470 /* Handle possible alignment issues */ bc9ffce27962c0 Myron Stowe 2011-11-07 471 memcpy(&addr, &gas->address, sizeof(addr)); f0340367a7885a James Liu 2021-10-22 472 if (!addr) 6915564dc5a8ab Rafael J. Wysocki 2020-09-11 473 return NULL; f0340367a7885a James Liu 2021-10-22 474 else 6915564dc5a8ab Rafael J. Wysocki 2020-09-11 475 return acpi_os_map_iomem(addr, gas->bit_width / 8); 29718521237a1b Myron Stowe 2010-10-21 476 } --- 0-DAY CI Kernel Test Service, Intel Corporation https://lists.01.org/hyperkitty/list/kbuild-all@xxxxxxxxxxxx
