[PATCH 1/1] acpi: Check walk_state->scope_info before dereferencing

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This fixes a NULL pointer derefence on an Acer Aspire E14 ES1-432-P06A.
The IP in the kernel panic trace points to
acpi_ds_load1_begin_op+0xde/0x283, which translates to the dereference
of walk_state->scope_info in that function.
---
 drivers/acpi/acpica/dswload.c | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/drivers/acpi/acpica/dswload.c b/drivers/acpi/acpica/dswload.c
index fd34040..17406ab 100644
--- a/drivers/acpi/acpica/dswload.c
+++ b/drivers/acpi/acpica/dswload.c
@@ -246,7 +246,8 @@ acpi_ds_load1_begin_op(struct acpi_walk_state *walk_state,
 					  acpi_ut_get_type_name(node->type)));
 
 			node->type = ACPI_TYPE_ANY;
-			walk_state->scope_info->common.value = ACPI_TYPE_ANY;
+			if (walk_state->scope_info)
+				walk_state->scope_info->common.value = ACPI_TYPE_ANY;
 			break;
 
 		case ACPI_TYPE_METHOD:
-- 
2.8.1

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