From 2dc80145811adfd6506284cf8afcd5adf8757d54 Mon Sep 17 00:00:00 2001
From: Grey Li <grey.li@rock-chips.com>
Date: Fri, 17 Jan 2020 09:50:47 +0800
Subject: [PATCH] video: rockchip: mpp: fix potential spectre issue by using
 array_index_nospec

Change-Id: I40018bac0f5406bc983fbd069c0dbf061f423669
Signed-off-by: Grey Li <grey.li@rock-chips.com>
---
 drivers/video/rockchip/mpp/mpp_common.c | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/drivers/video/rockchip/mpp/mpp_common.c b/drivers/video/rockchip/mpp/mpp_common.c
index 90be3c7dcb0c..6e49c5f8a5a5 100644
--- a/drivers/video/rockchip/mpp/mpp_common.c
+++ b/drivers/video/rockchip/mpp/mpp_common.c
@@ -23,6 +23,7 @@
 #include <linux/mfd/syscon.h>
 #include <linux/slab.h>
 #include <linux/uaccess.h>
+#include <linux/nospec.h>
 
 #include <soc/rockchip/pm_domains.h>
 
@@ -776,6 +777,7 @@ static int mpp_process_request(struct mpp_session *session,
 				MPP_DEVICE_BUTT);
 			return -EINVAL;
 		}
+		client_type = array_index_nospec(client_type, MPP_DEVICE_BUTT);
 		mpp = srv->sub_devices[client_type];
 		if (!mpp)
 			return -EINVAL;