linux-kernel - [PATCH 1/2] drm/mediatek: Fix child node refcount handling in early exit

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Message-Id: <20241011-mtk_drm_drv_memleak-v1-1-2b40c74c8d75@gmail.com>
Date: Fri, 11 Oct 2024 21:21:51 +0200
From: Javier Carrasco <javier.carrasco.cruz@...il.com>
To: Chun-Kuang Hu <chunkuang.hu@...nel.org>, 
 Philipp Zabel <p.zabel@...gutronix.de>, David Airlie <airlied@...il.com>, 
 Simona Vetter <simona@...ll.ch>, Matthias Brugger <matthias.bgg@...il.com>, 
 AngeloGioacchino Del Regno <angelogioacchino.delregno@...labora.com>, 
 Alexandre Mergnat <amergnat@...libre.com>, CK Hu <ck.hu@...iatek.com>, 
 "Jason-JH.Lin" <jason-jh.lin@...iatek.com>
Cc: dri-devel@...ts.freedesktop.org, linux-mediatek@...ts.infradead.org, 
 linux-kernel@...r.kernel.org, linux-arm-kernel@...ts.infradead.org, 
 Javier Carrasco <javier.carrasco.cruz@...il.com>, stable@...r.kernel.org
Subject: [PATCH 1/2] drm/mediatek: Fix child node refcount handling in
 early exit

Early exits (goto, break, return) from for_each_child_of_node() required
an explicit call to of_node_put(), which was not introduced with the
break if cnt == MAX_CRTC.

Add the missing of_node_put() before the break.

Cc: stable@...r.kernel.org
Fixes: d761b9450e31 ("drm/mediatek: Add cnt checking for coverity issue")

Signed-off-by: Javier Carrasco <javier.carrasco.cruz@...il.com>
---
 drivers/gpu/drm/mediatek/mtk_drm_drv.c | 4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)

diff --git a/drivers/gpu/drm/mediatek/mtk_drm_drv.c b/drivers/gpu/drm/mediatek/mtk_drm_drv.c
index a4594f8873d5..0878df832859 100644
--- a/drivers/gpu/drm/mediatek/mtk_drm_drv.c
+++ b/drivers/gpu/drm/mediatek/mtk_drm_drv.c
@@ -406,8 +406,10 @@ static bool mtk_drm_get_all_drm_priv(struct device *dev)
 		if (temp_drm_priv->mtk_drm_bound)
 			cnt++;
 
-		if (cnt == MAX_CRTC)
+		if (cnt == MAX_CRTC) {
+			of_node_put(node);
 			break;
+		}
 	}
 
 	if (drm_priv->data->mmsys_dev_num == cnt) {

-- 
2.43.0