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Subject[PATCH 1/1] ACPI: NULL pointer checking
Date
These two pointers should be checked, for some broken devices they may
cause system crash.

Signed-off-by: Zhenhua <lizhenhuajiyang@163.com>
---
drivers/acpi/acpica/nsaccess.c | 4 ++--
1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/drivers/acpi/acpica/nsaccess.c b/drivers/acpi/acpica/nsaccess.c
index f2733f51ca8d..151abb0ef4d5 100644
--- a/drivers/acpi/acpica/nsaccess.c
+++ b/drivers/acpi/acpica/nsaccess.c
@@ -338,7 +338,7 @@ acpi_ns_lookup(union acpi_generic_state *scope_info,
return_ACPI_STATUS(AE_AML_INTERNAL);
}

- if (!(flags & ACPI_NS_PREFIX_IS_SCOPE)) {
+ if ((!prefix_node) && (!(flags & ACPI_NS_PREFIX_IS_SCOPE))) {
/*
* This node might not be a actual "scope" node (such as a
* Device/Method, etc.) It could be a Package or other object
@@ -369,7 +369,7 @@ acpi_ns_lookup(union acpi_generic_state *scope_info,
ACPI_DEBUG_PRINT((ACPI_DB_NAMES,
"Null Pathname (Zero segments), Flags=%X\n",
flags));
- } else {
+ } else if (path) {
/*
* Name pointer is valid (and must be in internal name format)
*
--
2.14.1

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