thinkpad_acpi: fix possible NULL pointer dereference if kstrdup failed

Signed-off-by: Cyrill Gorcunov <gorcunov@gmail.com>
Acked-by: Henrique de Moraes Holschuh <hmh@hmh.eng.br>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Len Brown <len.brown@intel.com>

diff --git a/drivers/misc/thinkpad_acpi.c b/drivers/misc/thinkpad_acpi.c
index 6cb7812..31115c9 100644 (file)
--- a/drivers/misc/thinkpad_acpi.c
+++ b/drivers/misc/thinkpad_acpi.c
@@ -5826,7 +5826,7 @@ static void __init get_thinkpad_model_data(struct thinkpad_id_data *tp)
 
        tp->model_str = kstrdup(dmi_get_system_info(DMI_PRODUCT_VERSION),
                                        GFP_KERNEL);
-       if (strnicmp(tp->model_str, "ThinkPad", 8) != 0) {
+       if (tp->model_str && strnicmp(tp->model_str, "ThinkPad", 8) != 0) {
                kfree(tp->model_str);
                tp->model_str = NULL;
        }