linux-kernel - [PATCH] drm/msm/dpu: Fix memory leak in msm_mdss_parse_data_bus_icc

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Message-Id: <20221206075512.812389-1-linmq006@gmail.com>
Date:   Tue,  6 Dec 2022 11:55:12 +0400
From:   Miaoqian Lin <linmq006@...il.com>
To:     Rob Clark <robdclark@...il.com>,
        Abhinav Kumar <quic_abhinavk@...cinc.com>,
        Dmitry Baryshkov <dmitry.baryshkov@...aro.org>,
        Sean Paul <sean@...rly.run>, David Airlie <airlied@...il.com>,
        Daniel Vetter <daniel@...ll.ch>,
        Stephen Boyd <swboyd@...omium.org>,
        Douglas Anderson <dianders@...omium.org>,
        linux-arm-msm@...r.kernel.org, dri-devel@...ts.freedesktop.org,
        freedreno@...ts.freedesktop.org, linux-kernel@...r.kernel.org
Cc:     linmq006@...il.com
Subject: [PATCH] drm/msm/dpu: Fix memory leak in msm_mdss_parse_data_bus_icc_path

of_icc_get() alloc resources for path1, we should release it when not
need anymore. Early return when IS_ERR_OR_NULL(path0) may leak path1.
Add icc_put(path1) in the error path to fix this.

Fixes: b9364eed9232 ("drm/msm/dpu: Move min BW request and full BW disable back to mdss")
Signed-off-by: Miaoqian Lin <linmq006@...il.com>
---
 drivers/gpu/drm/msm/msm_mdss.c | 4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)

diff --git a/drivers/gpu/drm/msm/msm_mdss.c b/drivers/gpu/drm/msm/msm_mdss.c
index e13c5c12b775..a38fa9a9a3d6 100644
--- a/drivers/gpu/drm/msm/msm_mdss.c
+++ b/drivers/gpu/drm/msm/msm_mdss.c
@@ -49,8 +49,10 @@ static int msm_mdss_parse_data_bus_icc_path(struct device *dev,
 	struct icc_path *path0 = of_icc_get(dev, "mdp0-mem");
 	struct icc_path *path1 = of_icc_get(dev, "mdp1-mem");
 
-	if (IS_ERR_OR_NULL(path0))
+	if (IS_ERR_OR_NULL(path0)) {
+		icc_put(path1);
 		return PTR_ERR_OR_ZERO(path0);
+	}
 
 	msm_mdss->path[0] = path0;
 	msm_mdss->num_paths = 1;
-- 
2.25.1