WMI: fix potential NULL pointer dereference

Signed-off-by: Dmitry Torokhov <dtor@mail.ru>
Signed-off-by: Matthew Garrett <mjg@redhat.com>

diff --git a/drivers/platform/x86/wmi.c b/drivers/platform/x86/wmi.c
index a24a4b5..81552bc 100644 (file)
--- a/drivers/platform/x86/wmi.c
+++ b/drivers/platform/x86/wmi.c
@@ -824,6 +824,8 @@ static acpi_status parse_wdg(acpi_handle handle)
                return status;
 
        obj = (union acpi_object *) out.pointer;
+       if (!obj)
+               return AE_ERROR;
 
        if (obj->type != ACPI_TYPE_BUFFER) {
                status = AE_ERROR;