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acpi: Fix broken error check in map_processor() 

map_processor() checks the cpuid value returned by acpi_map_cpuid() for -1
but acpi_map_cpuid() returns -EINVAL in case of error.

As a consequence the error is ignored and the following access into percpu
data with that negative cpuid results in a boot crash.

This happens always when NR_CPUS/nr_cpu_ids is smaller than the number of
processors listed in the ACPI tables.

Use a proper error check for id < 0 so the function returns instead of
trying to map CPU#(-EINVAL).

Reported-by: Ingo Molnar <mingo@kernel.org>
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Cc: Dou Liyang <douly.fnst@cn.fujitsu.com>
Cc: Gu Zheng <guz.fnst@cn.fujitsu.com>
Cc: Linus Torvalds <torvalds@linux-foundation.org>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Tang Chen <tangchen@cn.fujitsu.com>
Cc: Zhu Guihua <zhugh.fnst@cn.fujitsu.com>
Cc: akpm@linux-foundation.org
Cc: chen.tang@easystack.cn
Cc: cl@linux.com
Cc: gongzhaogang@inspur.com
Cc: isimatu.yasuaki@jp.fujitsu.com
Cc: izumi.taku@jp.fujitsu.com
Cc: kamezawa.hiroyu@jp.fujitsu.com
Cc: len.brown@intel.com
Cc: lenb@kernel.org
Cc: linux-acpi@vger.kernel.org
Cc: linux-mm@kvack.org
Cc: mika.j.penttila@gmail.com
Cc: rafael@kernel.org
Cc: rjw@rjwysocki.net
Cc: tj@kernel.org
Cc: yasu.isimatu@gmail.com
Fixes: dc6db24d24 ("x86/acpi: Set persistent cpuid <-> nodeid mapping when booting")
Link: http://lkml.kernel.org/r/alpine.DEB.2.20.1609231705570.5640@nanos
Signed-off-by: Ingo Molnar <mingo@kernel.org>
This commit is contained in:
Thomas Gleixner 2016-09-23 17:08:04 +02:00 committed by Ingo Molnar
parent fd74da217d
commit c183a603e8
1 changed files with 5 additions and 4 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

9
drivers/acpi/processor_core.c
View File

@ -284,7 +284,7 @@ EXPORT_SYMBOL_GPL(acpi_get_cpuid);
static bool __init
map_processor(acpi_handle handle, phys_cpuid_t *phys_id, int *cpuid)
{
int type;
int type, id;
u32 acpi_id;
acpi_status status;
acpi_object_type acpi_type;
@ -320,10 +320,11 @@ map_processor(acpi_handle handle, phys_cpuid_t *phys_id, int *cpuid)
type = (acpi_type == ACPI_TYPE_DEVICE) ? 1 : 0;
*phys_id = __acpi_get_phys_id(handle, type, acpi_id, false);
*cpuid = acpi_map_cpuid(*phys_id, acpi_id);
if (*cpuid == -1)
return false;
id = acpi_map_cpuid(*phys_id, acpi_id);
if (id < 0)
return false;
*cpuid = id;
return true;
}