From: Dou Liyang Date: Thu, 12 Apr 2018 01:40:52 +0000 (+0800) Subject: x86/acpi: Prevent X2APIC id 0xffffffff from being accounted X-Git-Url: https://git.stricted.de/?a=commitdiff_plain;h=b8d4055372b58aad4a51b67e176eabdcc238fde3;p=GitHub%2FLineageOS%2Fandroid_kernel_motorola_exynos9610.git x86/acpi: Prevent X2APIC id 0xffffffff from being accounted commit 10daf10ab154e31237a8c07242be3063fb6a9bf4 upstream. RongQing reported that there are some X2APIC id 0xffffffff in his machine's ACPI MADT table, which makes the number of possible CPU inaccurate. The reason is that the ACPI X2APIC parser has no sanity check for APIC ID 0xffffffff, which is an invalid id in all APIC types. See "Intel® 64 Architecture x2APIC Specification", Chapter 2.4.1. Add a sanity check to acpi_parse_x2apic() which ignores the invalid id. Reported-by: Li RongQing Signed-off-by: Dou Liyang Signed-off-by: Thomas Gleixner Cc: stable@vger.kernel.org Cc: len.brown@intel.com Cc: rjw@rjwysocki.net Cc: hpa@zytor.com Link: https://lkml.kernel.org/r/20180412014052.25186-1-douly.fnst@cn.fujitsu.com Signed-off-by: Greg Kroah-Hartman --- diff --git a/arch/x86/kernel/acpi/boot.c b/arch/x86/kernel/acpi/boot.c index 9c2a002d9297..6dda3595acf8 100644 --- a/arch/x86/kernel/acpi/boot.c +++ b/arch/x86/kernel/acpi/boot.c @@ -215,6 +215,10 @@ acpi_parse_x2apic(struct acpi_subtable_header *header, const unsigned long end) apic_id = processor->local_apic_id; enabled = processor->lapic_flags & ACPI_MADT_ENABLED; + /* Ignore invalid ID */ + if (apic_id == 0xffffffff) + return 0; + /* * We need to register disabled CPU as well to permit * counting disabled CPUs. This allows us to size