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acpi: Fix broken error check in map_processor()

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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 <[email protected]>
Signed-off-by: Thomas Gleixner <[email protected]>
Cc: Dou Liyang <[email protected]>
Cc: Gu Zheng <[email protected]>
Cc: Linus Torvalds <[email protected]>
Cc: Peter Zijlstra <[email protected]>
Cc: Tang Chen <[email protected]>
Cc: Zhu Guihua <[email protected]>
Cc: [email protected]
Cc: [email protected]
Cc: [email protected]
Cc: [email protected]
Cc: [email protected]
Cc: [email protected]
Cc: [email protected]
Cc: [email protected]
Cc: [email protected]
Cc: [email protected]
Cc: [email protected]
Cc: [email protected]
Cc: [email protected]
Cc: [email protected]
Cc: [email protected]
Cc: [email protected]
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 <[email protected]>
This commit is contained in:
Thomas Gleixner 2016-09-23 17:08:04 +02:00 • committed by Ingo Molnar
commit c183a603e8
1 changed files with 5 additions and 4 deletions
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;
}