[PATCH] drm/rockchip: Avoid uninitialized use of endpoint id in LVDS

[PATCH] drm/rockchip: Avoid uninitialized use of endpoint id in LVDS

[Paul Kocialkowski]

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@bootlin.com>
---
 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 f292c6a6e20f..41edd0a421b2 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);
-- 
2.28.0

Re: [PATCH] drm/rockchip: Avoid uninitialized use of endpoint id in LVDS

[Heiko Stuebner]

On Tue, 10 Nov 2020 21:04:30 +0100, Paul Kocialkowski wrote:
> 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.

Applied, thanks!

[1/1] drm/rockchip: Avoid uninitialized use of endpoint id in LVDS
      commit: aec9fe892812ed10d0bffcf309d2a8fc380d8ce6

Best regards,
-- 
Heiko Stuebner <heiko@sntech.de>