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authorThomas Gleixner <tglx@linutronix.de>2016-09-23 18:08:04 +0300
committerIngo Molnar <mingo@kernel.org>2016-09-23 19:04:56 +0300
commitc183a603e8d8a5a189729b77d0c623a3d5950e5f (patch)
tree8effe6a4852a86faa9799e899b7c7488973ad033 /drivers/acpi
parentfd74da217df7d4bd25e95411da64e0b92762842e (diff)
downloadlinux-c183a603e8d8a5a189729b77d0c623a3d5950e5f.tar.xz
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: dc6db24d2476 ("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>
Diffstat (limited to 'drivers/acpi')
-rw-r--r--drivers/acpi/processor_core.c9
1 files changed, 5 insertions, 4 deletions
diff --git a/drivers/acpi/processor_core.c b/drivers/acpi/processor_core.c
index 9ac265f235b7..5c78ee1860b0 100644
--- a/drivers/acpi/processor_core.c
+++ b/drivers/acpi/processor_core.c
@@ -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;
}