linux-kernel - [PATCH v2] drm/meson: fix possible object reference leak

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Date:   Mon, 8 Apr 2019 10:58:31 +0800
From:   Wen Yang <wen.yang99@....com.cn>
To:     linux-kernel@...r.kernel.org
Cc:     wang.yi59@....com.cn, Wen Yang <wen.yang99@....com.cn>,
        Neil Armstrong <narmstrong@...libre.com>,
        David Airlie <airlied@...ux.ie>,
        Daniel Vetter <daniel@...ll.ch>,
        Kevin Hilman <khilman@...libre.com>,
        dri-devel@...ts.freedesktop.org, linux-amlogic@...ts.infradead.org,
        linux-arm-kernel@...ts.infradead.org,
        Markus Elfring <Markus.Elfring@....de>
Subject: [PATCH v2] drm/meson: fix possible object reference leak

The call to of_graph_get_remote_port returns a node pointer with refcount
incremented thus it must be explicitly decremented after the last
usage.

Detected by coccinelle with the following warnings:
drivers/gpu/drm/meson/meson_dw_hdmi.c:725:2-8: ERROR: missing of_node_put; acquired a node pointer with refcount incremented on line 722, but without a corresponding object release within this function.

Signed-off-by: Wen Yang <wen.yang99@....com.cn>
Cc: Neil Armstrong <narmstrong@...libre.com>
Cc: David Airlie <airlied@...ux.ie>
Cc: Daniel Vetter <daniel@...ll.ch>
Cc: Kevin Hilman <khilman@...libre.com>
Cc: dri-devel@...ts.freedesktop.org
Cc: linux-amlogic@...ts.infradead.org
Cc: linux-arm-kernel@...ts.infradead.org
Cc: linux-kernel@...r.kernel.org
Cc: Markus Elfring <Markus.Elfring@....de>
---
v2->v1: convert a if statement into a ternary statement.

 drivers/gpu/drm/meson/meson_dw_hdmi.c | 7 +------
 1 file changed, 1 insertion(+), 6 deletions(-)

diff --git a/drivers/gpu/drm/meson/meson_dw_hdmi.c b/drivers/gpu/drm/meson/meson_dw_hdmi.c
index 563953e..826b98b 100644
--- a/drivers/gpu/drm/meson/meson_dw_hdmi.c
+++ b/drivers/gpu/drm/meson/meson_dw_hdmi.c
@@ -720,15 +720,10 @@ static bool meson_hdmi_connector_is_available(struct device *dev)
 
 	/* If the endpoint node exists, consider it enabled */
 	remote = of_graph_get_remote_port(ep);
-	if (remote) {
-		of_node_put(ep);
-		return true;
-	}
-
 	of_node_put(ep);
 	of_node_put(remote);
 
-	return false;
+	return remote ? true : false;
 }
 
 static int meson_dw_hdmi_bind(struct device *dev, struct device *master,
-- 
2.9.5