linux-kernel - [PATCH 5.9 022/105] drm/rockchip: Avoid uninitialized use of endpoint id in LVDS

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Message-Id: <20201214172556.341254481@linuxfoundation.org>
Date:   Mon, 14 Dec 2020 18:27:56 +0100
From:   Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:     linux-kernel@...r.kernel.org
Cc:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        stable@...r.kernel.org,
        Paul Kocialkowski <paul.kocialkowski@...tlin.com>,
        Heiko Stuebner <heiko@...ech.de>,
        Sasha Levin <sashal@...nel.org>
Subject: [PATCH 5.9 022/105] drm/rockchip: Avoid uninitialized use of endpoint id in LVDS

From: Paul Kocialkowski <paul.kocialkowski@...tlin.com>

[ Upstream commit aec9fe892812ed10d0bffcf309d2a8fc380d8ce6 ]

In the Rockchip DRM LVDS component driver, the endpoint id provided to
drm_of_find_panel_or_bridge is grabbed from the endpoint's reg property.

However, the property may be missing in the case of a single endpoint.
Initialize the endpoint_id variable to 0 to avoid using an
uninitialized variable in that case.

Fixes: 34cc0aa25456 ("drm/rockchip: Add support for Rockchip Soc LVDS")
Signed-off-by: Paul Kocialkowski <paul.kocialkowski@...tlin.com>
Signed-off-by: Heiko Stuebner <heiko@...ech.de>
Link: https://patchwork.freedesktop.org/patch/msgid/20201110200430.1713467-1-paul.kocialkowski@bootlin.com
Signed-off-by: Sasha Levin <sashal@...nel.org>
---
 drivers/gpu/drm/rockchip/rockchip_lvds.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/drivers/gpu/drm/rockchip/rockchip_lvds.c b/drivers/gpu/drm/rockchip/rockchip_lvds.c
index 63f967902c2d8..a29912f3b997e 100644
--- a/drivers/gpu/drm/rockchip/rockchip_lvds.c
+++ b/drivers/gpu/drm/rockchip/rockchip_lvds.c
@@ -544,7 +544,7 @@ static int rockchip_lvds_bind(struct device *dev, struct device *master,
 	struct device_node  *port, *endpoint;
 	int ret = 0, child_count = 0;
 	const char *name;
-	u32 endpoint_id;
+	u32 endpoint_id = 0;
 
 	lvds->drm_dev = drm_dev;
 	port = of_graph_get_port_by_id(dev->of_node, 1);
-- 
2.27.0