linux-kernel - [PATCH 4.9 32/74] drm/mediatek: mtk_drm_drv.c: Add of_node

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Message-Id: <20190919214808.152703553@linuxfoundation.org>
Date:   Fri, 20 Sep 2019 00:03:45 +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, Nishka Dasgupta <nishkadg.linux@...il.com>,
        CK Hu <ck.hu@...iatek.com>
Subject: [PATCH 4.9 32/74] drm/mediatek: mtk_drm_drv.c: Add of_node_put() before goto

From: Nishka Dasgupta <nishkadg.linux@...il.com>

commit 165d42c012be69900f0e2f8545626cb9e7d4a832 upstream.

Each iteration of for_each_child_of_node puts the previous
node, but in the case of a goto from the middle of the loop, there is
no put, thus causing a memory leak. Hence add an of_node_put before the
goto in two places.
Issue found with Coccinelle.

Fixes: 119f5173628a (drm/mediatek: Add DRM Driver for Mediatek SoC MT8173)

Signed-off-by: Nishka Dasgupta <nishkadg.linux@...il.com>
Signed-off-by: CK Hu <ck.hu@...iatek.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@...uxfoundation.org>

---
 drivers/gpu/drm/mediatek/mtk_drm_drv.c |    5 ++++-
 1 file changed, 4 insertions(+), 1 deletion(-)

--- a/drivers/gpu/drm/mediatek/mtk_drm_drv.c
+++ b/drivers/gpu/drm/mediatek/mtk_drm_drv.c
@@ -423,12 +423,15 @@ static int mtk_drm_probe(struct platform
 			comp = devm_kzalloc(dev, sizeof(*comp), GFP_KERNEL);
 			if (!comp) {
 				ret = -ENOMEM;
+				of_node_put(node);
 				goto err_node;
 			}
 
 			ret = mtk_ddp_comp_init(dev, node, comp, comp_id, NULL);
-			if (ret)
+			if (ret) {
+				of_node_put(node);
 				goto err_node;
+			}
 
 			private->ddp_comp[comp_id] = comp;
 		}