[PATCH] ACPICA: fix possible NULL dereference

[Sudip Mukherjee]

acpi_ns_get_secondary_object() can return NULL, and if it returns NULL
then we were dereferencing it while calling acpi_ds_execute_arguments().

Lets have a NULL check and return AE_NOT_EXIST.	

Signed-off-by: Sudip Mukherjee <sudip@xxxxxxxxxxxxxxx>
---
 drivers/acpi/acpica/dsargs.c | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/drivers/acpi/acpica/dsargs.c b/drivers/acpi/acpica/dsargs.c
index e2ab59e..4bb8952 100644
--- a/drivers/acpi/acpica/dsargs.c
+++ b/drivers/acpi/acpica/dsargs.c
@@ -192,6 +192,9 @@ acpi_ds_get_buffer_field_arguments(union acpi_operand_object *obj_desc)
 	/* Get the AML pointer (method object) and buffer_field node */
 
 	extra_desc = acpi_ns_get_secondary_object(obj_desc);
+	if (!extra_desc)
+		return_ACPI_STATUS(AE_NOT_EXIST);
+
 	node = obj_desc->buffer_field.node;
 
 	ACPI_DEBUG_EXEC(acpi_ut_display_init_pathname(ACPI_TYPE_BUFFER_FIELD,
-- 
1.9.1

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