linux-kernel - [PATCH 5.7 307/393] media: mtk-mdp: Fix a refcounting bug on error in init

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Message-Id: <20200817143834.504591582@linuxfoundation.org>
Date:   Mon, 17 Aug 2020 17:15:57 +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, Dan Carpenter <dan.carpenter@...cle.com>,
        Hans Verkuil <hverkuil-cisco@...all.nl>,
        Mauro Carvalho Chehab <mchehab+huawei@...nel.org>,
        Sasha Levin <sashal@...nel.org>
Subject: [PATCH 5.7 307/393] media: mtk-mdp: Fix a refcounting bug on error in init

From: Dan Carpenter <dan.carpenter@...cle.com>

[ Upstream commit dd4eddc4ba31fbf4554fc5fa12d3a553b50e1469 ]

We need to call of_node_put(comp->dev_node); on the error paths in this
function.

Fixes: c8eb2d7e8202 ("[media] media: Add Mediatek MDP Driver")
Signed-off-by: Dan Carpenter <dan.carpenter@...cle.com>
Signed-off-by: Hans Verkuil <hverkuil-cisco@...all.nl>
Signed-off-by: Mauro Carvalho Chehab <mchehab+huawei@...nel.org>
Signed-off-by: Sasha Levin <sashal@...nel.org>
---
 drivers/media/platform/mtk-mdp/mtk_mdp_comp.c | 16 ++++++++++++----
 1 file changed, 12 insertions(+), 4 deletions(-)

diff --git a/drivers/media/platform/mtk-mdp/mtk_mdp_comp.c b/drivers/media/platform/mtk-mdp/mtk_mdp_comp.c
index 14991685adb78..9b375d3677536 100644
--- a/drivers/media/platform/mtk-mdp/mtk_mdp_comp.c
+++ b/drivers/media/platform/mtk-mdp/mtk_mdp_comp.c
@@ -96,6 +96,7 @@ int mtk_mdp_comp_init(struct device *dev, struct device_node *node,
 {
 	struct device_node *larb_node;
 	struct platform_device *larb_pdev;
+	int ret;
 	int i;
 
 	if (comp_id < 0 || comp_id >= MTK_MDP_COMP_ID_MAX) {
@@ -113,8 +114,8 @@ int mtk_mdp_comp_init(struct device *dev, struct device_node *node,
 		if (IS_ERR(comp->clk[i])) {
 			if (PTR_ERR(comp->clk[i]) != -EPROBE_DEFER)
 				dev_err(dev, "Failed to get clock\n");
-
-			return PTR_ERR(comp->clk[i]);
+			ret = PTR_ERR(comp->clk[i]);
+			goto put_dev;
 		}
 
 		/* Only RDMA needs two clocks */
@@ -133,20 +134,27 @@ int mtk_mdp_comp_init(struct device *dev, struct device_node *node,
 	if (!larb_node) {
 		dev_err(dev,
 			"Missing mediadek,larb phandle in %pOF node\n", node);
-		return -EINVAL;
+		ret = -EINVAL;
+		goto put_dev;
 	}
 
 	larb_pdev = of_find_device_by_node(larb_node);
 	if (!larb_pdev) {
 		dev_warn(dev, "Waiting for larb device %pOF\n", larb_node);
 		of_node_put(larb_node);
-		return -EPROBE_DEFER;
+		ret = -EPROBE_DEFER;
+		goto put_dev;
 	}
 	of_node_put(larb_node);
 
 	comp->larb_dev = &larb_pdev->dev;
 
 	return 0;
+
+put_dev:
+	of_node_put(comp->dev_node);
+
+	return ret;
 }
 
 void mtk_mdp_comp_deinit(struct device *dev, struct mtk_mdp_comp *comp)
-- 
2.25.1