linux-kernel - [PATCH 5.4 098/255] drm/omap: dss: Fix refcount leak bugs

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Date:   Mon, 24 Oct 2022 13:30:08 +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>,
        Tomi Valkeinen <tomi.valkeinen@...asonboard.com>,
        Sasha Levin <sashal@...nel.org>
Subject: [PATCH 5.4 098/255] drm/omap: dss: Fix refcount leak bugs

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

[ Upstream commit 8b42057e62120813ebe9274f508fa785b7cab33a ]

In dss_init_ports() and __dss_uninit_ports(), we should call
of_node_put() for the reference returned by of_graph_get_port_by_id()
in fail path or when it is not used anymore.

Fixes: 09bffa6e5192 ("drm: omap: use common OF graph helpers")
Signed-off-by: Liang He <windhl@....com>
Signed-off-by: Tomi Valkeinen <tomi.valkeinen@...asonboard.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20220722144348.1306569-1-windhl@126.com
Signed-off-by: Sasha Levin <sashal@...nel.org>
---
 drivers/gpu/drm/omapdrm/dss/dss.c | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/drivers/gpu/drm/omapdrm/dss/dss.c b/drivers/gpu/drm/omapdrm/dss/dss.c
index ac93dae2a9c8..7f1d0a9afafb 100644
--- a/drivers/gpu/drm/omapdrm/dss/dss.c
+++ b/drivers/gpu/drm/omapdrm/dss/dss.c
@@ -1173,6 +1173,7 @@ static void __dss_uninit_ports(struct dss_device *dss, unsigned int num_ports)
 		default:
 			break;
 		}
+		of_node_put(port);
 	}
 }
 
@@ -1205,11 +1206,13 @@ static int dss_init_ports(struct dss_device *dss)
 		default:
 			break;
 		}
+		of_node_put(port);
 	}
 
 	return 0;
 
 error:
+	of_node_put(port);
 	__dss_uninit_ports(dss, i);
 	return r;
 }
-- 
2.35.1