linux-kernel - [PATCH AUTOSEL 5.19 05/36] gpu: lontium-lt9611: Fix NULL pointer dereference in lt9611_connector

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Date:   Sun,  9 Oct 2022 19:51:51 -0400
From:   Sasha Levin <sashal@...nel.org>
To:     linux-kernel@...r.kernel.org, stable@...r.kernel.org
Cc:     Zeng Jingxiang <linuszeng@...cent.com>,
        Robert Foss <robert.foss@...aro.org>,
        Sasha Levin <sashal@...nel.org>, andrzej.hajda@...el.com,
        neil.armstrong@...aro.org, airlied@...il.com, daniel@...ll.ch,
        dri-devel@...ts.freedesktop.org
Subject: [PATCH AUTOSEL 5.19 05/36] gpu: lontium-lt9611: Fix NULL pointer dereference in lt9611_connector_init()

From: Zeng Jingxiang <linuszeng@...cent.com>

[ Upstream commit ef8886f321c5dab8124b9153d25afa2a71d05323 ]

A NULL check for bridge->encoder shows that it may be NULL, but it
already been dereferenced on all paths leading to the check.
812	if (!bridge->encoder) {

Dereference the pointer bridge->encoder.
810	drm_connector_attach_encoder(&lt9611->connector, bridge->encoder);

Signed-off-by: Zeng Jingxiang <linuszeng@...cent.com>
Signed-off-by: Robert Foss <robert.foss@...aro.org>
Link: https://patchwork.freedesktop.org/patch/msgid/20220727073119.1578972-1-zengjx95@gmail.com
Signed-off-by: Sasha Levin <sashal@...nel.org>
---
 drivers/gpu/drm/bridge/lontium-lt9611.c | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/drivers/gpu/drm/bridge/lontium-lt9611.c b/drivers/gpu/drm/bridge/lontium-lt9611.c
index c0b182d1374e..7f688ebd36eb 100644
--- a/drivers/gpu/drm/bridge/lontium-lt9611.c
+++ b/drivers/gpu/drm/bridge/lontium-lt9611.c
@@ -807,13 +807,14 @@ static int lt9611_connector_init(struct drm_bridge *bridge, struct lt9611 *lt961
 
 	drm_connector_helper_add(&lt9611->connector,
 				 &lt9611_bridge_connector_helper_funcs);
-	drm_connector_attach_encoder(&lt9611->connector, bridge->encoder);
 
 	if (!bridge->encoder) {
 		DRM_ERROR("Parent encoder object not found");
 		return -ENODEV;
 	}
 
+	drm_connector_attach_encoder(&lt9611->connector, bridge->encoder);
+
 	return 0;
 }
 
-- 
2.35.1