linux-kernel - [PATCH] ARM: OMAP2+: Fix refcount leak in omapdss_init

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Message-Id: <20220601044858.3352-1-linmq006@gmail.com>
Date:   Wed,  1 Jun 2022 08:48:58 +0400
From:   Miaoqian Lin <linmq006@...il.com>
To:     Tony Lindgren <tony@...mide.com>,
        Russell King <linux@...linux.org.uk>,
        Laurent Pinchart <laurent.pinchart@...asonboard.com>,
        Tomi Valkeinen <tomi.valkeinen@...com>,
        Sebastian Reichel <sebastian.reichel@...labora.com>,
        linux-arm-kernel@...ts.infradead.org, linux-omap@...r.kernel.org,
        linux-kernel@...r.kernel.org
Cc:     linmq006@...il.com
Subject: [PATCH] ARM: OMAP2+: Fix refcount leak in omapdss_init_of

omapdss_find_dss_of_node() calls of_find_compatible_node() to get device
node. of_find_compatible_node() returns a node pointer with refcount
incremented, we should use of_node_put() on it when done.
Add missing of_node_put() in later error path and normal path.

Fixes: e0c827aca0730 ("drm/omap: Populate DSS children in omapdss driver")
Signed-off-by: Miaoqian Lin <linmq006@...il.com>
---
 arch/arm/mach-omap2/display.c | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/arch/arm/mach-omap2/display.c b/arch/arm/mach-omap2/display.c
index 21413a9b7b6c..ed2cb2649cf6 100644
--- a/arch/arm/mach-omap2/display.c
+++ b/arch/arm/mach-omap2/display.c
@@ -259,11 +259,13 @@ static int __init omapdss_init_of(void)
 
 	if (!pdev) {
 		pr_err("Unable to find DSS platform device\n");
+		of_node_put(node);
 		return -ENODEV;
 	}
 
 	r = of_platform_populate(node, NULL, NULL, &pdev->dev);
 	put_device(&pdev->dev);
+	of_node_put(node);
 	if (r) {
 		pr_err("Unable to populate DSS submodule devices\n");
 		return r;
-- 
2.25.1