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From:   Sasha Levin <Alexander.Levin@microsoft.com>
To:     "stable@vger.kernel.org" <stable@vger.kernel.org>,
        "linux-kernel@vger.kernel.org" <linux-kernel@vger.kernel.org>
CC:     Jernej Skrabec <jernej.skrabec@siol.net>,
        Maxime Ripard <maxime.ripard@bootlin.com>,
        Sasha Levin <Alexander.Levin@microsoft.com>
Subject: [PATCH AUTOSEL 4.18 089/136] drm/sun4i: Fix releasing node when
 enumerating enpoints
Thread-Topic: [PATCH AUTOSEL 4.18 089/136] drm/sun4i: Fix releasing node when
 enumerating enpoints
Thread-Index: AQHUTjKupYpljfLmoU2LqMZORwY2kQ==
Date:   Mon, 17 Sep 2018 03:01:08 +0000
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From: Jernej Skrabec <jernej.skrabec@siol.net>

[ Upstream commit 367c359aa8637b15ee8df6335c5a29b7623966ec ]

sun4i_drv_add_endpoints() has a memory leak since it uses of_node_put()
when remote is equal to NULL and does nothing when remote has a valid
pointer.

Invert the logic to fix memory leak.

Signed-off-by: Jernej Skrabec <jernej.skrabec@siol.net>
Signed-off-by: Maxime Ripard <maxime.ripard@bootlin.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20180625120304.7543-7-j=
ernej.skrabec@siol.net
Signed-off-by: Sasha Levin <alexander.levin@microsoft.com>
---
 drivers/gpu/drm/sun4i/sun4i_drv.c | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/drivers/gpu/drm/sun4i/sun4i_drv.c b/drivers/gpu/drm/sun4i/sun4=
i_drv.c
index 50d19605c38f..e15fa2389e3f 100644
--- a/drivers/gpu/drm/sun4i/sun4i_drv.c
+++ b/drivers/gpu/drm/sun4i/sun4i_drv.c
@@ -283,7 +283,6 @@ static int sun4i_drv_add_endpoints(struct device *dev,
 		remote =3D of_graph_get_remote_port_parent(ep);
 		if (!remote) {
 			DRM_DEBUG_DRIVER("Error retrieving the output node\n");
-			of_node_put(remote);
 			continue;
 		}
=20
@@ -297,11 +296,13 @@ static int sun4i_drv_add_endpoints(struct device *dev=
,
=20
 			if (of_graph_parse_endpoint(ep, &endpoint)) {
 				DRM_DEBUG_DRIVER("Couldn't parse endpoint\n");
+				of_node_put(remote);
 				continue;
 			}
=20
 			if (!endpoint.id) {
 				DRM_DEBUG_DRIVER("Endpoint is our panel... skipping\n");
+				of_node_put(remote);
 				continue;
 			}
 		}
--=20
2.17.1