From: Dan Carpenter <dan.carpenter@linaro.org> mainline inclusion from mainline-v6.12-rc5 commit 3d1c651272cf1df8aac7d9b6d92d836d27bed50f category: bugfix bugzilla: https://gitee.com/openeuler/intel-kernel/issues/IB2SU5 CVE: CVE-2024-50141 Reference: https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?i... ------------------------------------- Clang 19 prints a warning when we pass &th->guid to efi_pa_va_lookup(): drivers/acpi/prmt.c:156:29: error: passing 1-byte aligned argument to 4-byte aligned parameter 1 of 'efi_pa_va_lookup' may result in an unaligned pointer access [-Werror,-Walign-mismatch] 156 | (void *)efi_pa_va_lookup(&th->guid, handler_info->handler_address); | ^ The problem is that efi_pa_va_lookup() takes a efi_guid_t and &th->guid is a regular guid_t. The difference between the two types is the alignment. efi_guid_t is a typedef. typedef guid_t efi_guid_t __aligned(__alignof__(u32)); It's possible that this a bug in Clang 19. Even though the alignment of &th->guid is not explicitly specified, it will still end up being aligned at 4 or 8 bytes. Anyway, as Ard points out, it's cleaner to change guid to efi_guid_t type and that also makes the warning go away. Fixes: 088984c8d54c ("ACPI: PRM: Find EFI_MEMORY_RUNTIME block for PRM handler and context") Reported-by: Linux Kernel Functional Testing <lkft@linaro.org> Suggested-by: Ard Biesheuvel <ardb@kernel.org> Signed-off-by: Dan Carpenter <dan.carpenter@linaro.org> Tested-by: Paul E. McKenney <paulmck@kernel.org> Acked-by: Ard Biesheuvel <ardb@kernel.org> Link: https://patch.msgid.link/3777d71b-9e19-45f4-be4e-17bf4fa7a834@stanley.mounta... [ rjw: Subject edit ] Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com> Conflicts: drivers/acpi/prmt.c [context conflict] Signed-off-by: Xiangwei Li <liwei728@huawei.com> --- drivers/acpi/prmt.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) diff --git a/drivers/acpi/prmt.c b/drivers/acpi/prmt.c index 44d2d9084e4b..dd0261fd12d6 100644 --- a/drivers/acpi/prmt.c +++ b/drivers/acpi/prmt.c @@ -52,7 +52,7 @@ struct prm_context_buffer { static LIST_HEAD(prm_module_list); struct prm_handler_info { - guid_t guid; + efi_guid_t guid; void *handler_addr; u64 static_data_buffer_addr; u64 acpi_param_buffer_addr; -- 2.25.1