diff --git a/drivers/media/video/tuner-core.c b/drivers/media/video/tuner-core.c
index 2a957e2..421475e 100644
--- a/drivers/media/video/tuner-core.c
+++ b/drivers/media/video/tuner-core.c
@@ -364,7 +364,8 @@
 	}
 
 	t->type = type;
-	t->config = new_config;
+	/* prevent invalid config values */
+	t->config = ((new_config >= 0) && (new_config < 256)) ? new_config : 0;
 	if (tuner_callback != NULL) {
 		tuner_dbg("defining GPIO callback\n");
 		t->fe.callback = tuner_callback;