linux-kernel - [PATCH 5.18 0912/1095] video: fbdev: amba-clcd: Fix refcount leak bugs

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Message-Id: <20220815180507.015333870@linuxfoundation.org>
Date:   Mon, 15 Aug 2022 20:05:11 +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, Liang He <windhl@....com>,
        Helge Deller <deller@....de>, Sasha Levin <sashal@...nel.org>
Subject: [PATCH 5.18 0912/1095] video: fbdev: amba-clcd: Fix refcount leak bugs

From: Liang He <windhl@....com>

[ Upstream commit 26c2b7d9fac42eb8317f3ceefa4c1a9a9170ca69 ]

In clcdfb_of_init_display(), we should call of_node_put() for the
references returned by of_graph_get_next_endpoint() and
of_graph_get_remote_port_parent() which have increased the refcount.

Besides, we should call of_node_put() both in fail path or when
the references are not used anymore.

Fixes: d10715be03bd ("video: ARM CLCD: Add DT support")
Signed-off-by: Liang He <windhl@....com>
Signed-off-by: Helge Deller <deller@....de>
Signed-off-by: Sasha Levin <sashal@...nel.org>
---
 drivers/video/fbdev/amba-clcd.c | 24 ++++++++++++++++++------
 1 file changed, 18 insertions(+), 6 deletions(-)

diff --git a/drivers/video/fbdev/amba-clcd.c b/drivers/video/fbdev/amba-clcd.c
index 8080116aea84..f65c96d1394d 100644
--- a/drivers/video/fbdev/amba-clcd.c
+++ b/drivers/video/fbdev/amba-clcd.c
@@ -698,16 +698,18 @@ static int clcdfb_of_init_display(struct clcd_fb *fb)
 		return -ENODEV;
 
 	panel = of_graph_get_remote_port_parent(endpoint);
-	if (!panel)
-		return -ENODEV;
+	if (!panel) {
+		err = -ENODEV;
+		goto out_endpoint_put;
+	}
 
 	err = clcdfb_of_get_backlight(&fb->dev->dev, fb->panel);
 	if (err)
-		return err;
+		goto out_panel_put;
 
 	err = clcdfb_of_get_mode(&fb->dev->dev, panel, fb->panel);
 	if (err)
-		return err;
+		goto out_panel_put;
 
 	err = of_property_read_u32(fb->dev->dev.of_node, "max-memory-bandwidth",
 			&max_bandwidth);
@@ -736,11 +738,21 @@ static int clcdfb_of_init_display(struct clcd_fb *fb)
 
 	if (of_property_read_u32_array(endpoint,
 			"arm,pl11x,tft-r0g0b0-pads",
-			tft_r0b0g0, ARRAY_SIZE(tft_r0b0g0)) != 0)
-		return -ENOENT;
+			tft_r0b0g0, ARRAY_SIZE(tft_r0b0g0)) != 0) {
+		err = -ENOENT;
+		goto out_panel_put;
+	}
+
+	of_node_put(panel);
+	of_node_put(endpoint);
 
 	return clcdfb_of_init_tft_panel(fb, tft_r0b0g0[0],
 					tft_r0b0g0[1],  tft_r0b0g0[2]);
+out_panel_put:
+	of_node_put(panel);
+out_endpoint_put:
+	of_node_put(endpoint);
+	return err;
 }
 
 static int clcdfb_of_vram_setup(struct clcd_fb *fb)
-- 
2.35.1