linux-kernel - [PATCH 5.19 0341/1157] drm/meson: encoder_hdmi: Fix refcount leak in meson_encoder_hdmi

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Message-Id: <20220815180453.324844206@linuxfoundation.org>
Date:   Mon, 15 Aug 2022 19:54:57 +0200
From:   Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:     linux-kernel@...r.kernel.org
Cc:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        stable@...r.kernel.org, Miaoqian Lin <linmq006@...il.com>,
        Martin Blumenstingl <martin.blumenstingl@...glemail.com>,
        Neil Armstrong <narmstrong@...libre.com>,
        Sasha Levin <sashal@...nel.org>
Subject: [PATCH 5.19 0341/1157] drm/meson: encoder_hdmi: Fix refcount leak in meson_encoder_hdmi_init

From: Miaoqian Lin <linmq006@...il.com>

[ Upstream commit d82a5a4aae9d0203234737caed1bf470aa317568 ]

of_graph_get_remote_node() returns remote device nodepointer with
refcount incremented, we should use of_node_put() on it when done.
Add missing of_node_put() to avoid refcount leak.

Fixes: e67f6037ae1b ("drm/meson: split out encoder from meson_dw_hdmi")
Signed-off-by: Miaoqian Lin <linmq006@...il.com>
Reviewed-by: Martin Blumenstingl <martin.blumenstingl@...glemail.com>
Signed-off-by: Neil Armstrong <narmstrong@...libre.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20220601033927.47814-3-linmq006@gmail.com
Signed-off-by: Sasha Levin <sashal@...nel.org>
---
 drivers/gpu/drm/meson/meson_encoder_hdmi.c | 15 +++++++++++----
 1 file changed, 11 insertions(+), 4 deletions(-)

diff --git a/drivers/gpu/drm/meson/meson_encoder_hdmi.c b/drivers/gpu/drm/meson/meson_encoder_hdmi.c
index de87f02cd388..a7692584487c 100644
--- a/drivers/gpu/drm/meson/meson_encoder_hdmi.c
+++ b/drivers/gpu/drm/meson/meson_encoder_hdmi.c
@@ -365,7 +365,8 @@ int meson_encoder_hdmi_init(struct meson_drm *priv)
 	meson_encoder_hdmi->next_bridge = of_drm_find_bridge(remote);
 	if (!meson_encoder_hdmi->next_bridge) {
 		dev_err(priv->dev, "Failed to find HDMI transceiver bridge\n");
-		return -EPROBE_DEFER;
+		ret = -EPROBE_DEFER;
+		goto err_put_node;
 	}
 
 	/* HDMI Encoder Bridge */
@@ -383,7 +384,7 @@ int meson_encoder_hdmi_init(struct meson_drm *priv)
 				      DRM_MODE_ENCODER_TMDS);
 	if (ret) {
 		dev_err(priv->dev, "Failed to init HDMI encoder: %d\n", ret);
-		return ret;
+		goto err_put_node;
 	}
 
 	meson_encoder_hdmi->encoder.possible_crtcs = BIT(0);
@@ -393,7 +394,7 @@ int meson_encoder_hdmi_init(struct meson_drm *priv)
 				DRM_BRIDGE_ATTACH_NO_CONNECTOR);
 	if (ret) {
 		dev_err(priv->dev, "Failed to attach bridge: %d\n", ret);
-		return ret;
+		goto err_put_node;
 	}
 
 	/* Initialize & attach Bridge Connector */
@@ -401,7 +402,8 @@ int meson_encoder_hdmi_init(struct meson_drm *priv)
 							&meson_encoder_hdmi->encoder);
 	if (IS_ERR(meson_encoder_hdmi->connector)) {
 		dev_err(priv->dev, "Unable to create HDMI bridge connector\n");
-		return PTR_ERR(meson_encoder_hdmi->connector);
+		ret = PTR_ERR(meson_encoder_hdmi->connector);
+		goto err_put_node;
 	}
 	drm_connector_attach_encoder(meson_encoder_hdmi->connector,
 				     &meson_encoder_hdmi->encoder);
@@ -428,6 +430,7 @@ int meson_encoder_hdmi_init(struct meson_drm *priv)
 	meson_encoder_hdmi->connector->ycbcr_420_allowed = true;
 
 	pdev = of_find_device_by_node(remote);
+	of_node_put(remote);
 	if (pdev) {
 		struct cec_connector_info conn_info;
 		struct cec_notifier *notifier;
@@ -446,4 +449,8 @@ int meson_encoder_hdmi_init(struct meson_drm *priv)
 	dev_dbg(priv->dev, "HDMI encoder initialized\n");
 
 	return 0;
+
+err_put_node:
+	of_node_put(remote);
+	return ret;
 }
-- 
2.35.1