linux-kernel - [PATCH 4/5] clk: mediatek: clk-mt7629-eth: Add check for mtk_alloc_clk

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Message-Id: <20230912093407.21505-4-jiasheng@iscas.ac.cn>
Date:   Tue, 12 Sep 2023 17:34:06 +0800
From:   Jiasheng Jiang <jiasheng@...as.ac.cn>
To:     mturquette@...libre.com, sboyd@...nel.org, matthias.bgg@...il.com,
        angelogioacchino.delregno@...labora.com, wenst@...omium.org,
        msp@...libre.com, amergnat@...libre.com, frank.li@...o.com,
        robh@...nel.org, owen.chen@...iatek.com, mars.cheng@...iatek.com,
        macpaul.lin@...iatek.com, cw00.choi@...sung.com,
        u.kleine-koenig@...gutronix.de, wendell.lin@...iatek.com,
        luca.ceresoli@...tlin.com, kevin-cw.chen@...iatek.com,
        ryder.lee@...iatek.com, wenzhen.yu@...iatek.com
Cc:     linux-clk@...r.kernel.org, linux-kernel@...r.kernel.org,
        linux-arm-kernel@...ts.infradead.org,
        linux-mediatek@...ts.infradead.org,
        Jiasheng Jiang <jiasheng@...as.ac.cn>
Subject: [PATCH 4/5] clk: mediatek: clk-mt7629-eth: Add check for mtk_alloc_clk_data

Add the check for the return value of mtk_alloc_clk_data() in order to
avoid NULL pointer dereference.

Fixes: 3b5e748615e7 ("clk: mediatek: add clock support for MT7629 SoC")
Signed-off-by: Jiasheng Jiang <jiasheng@...as.ac.cn>
---
 drivers/clk/mediatek/clk-mt7629-eth.c | 4 ++++
 1 file changed, 4 insertions(+)

diff --git a/drivers/clk/mediatek/clk-mt7629-eth.c b/drivers/clk/mediatek/clk-mt7629-eth.c
index fe714debdc9e..1bfedc988cfe 100644
--- a/drivers/clk/mediatek/clk-mt7629-eth.c
+++ b/drivers/clk/mediatek/clk-mt7629-eth.c
@@ -77,6 +77,8 @@ static int clk_mt7629_ethsys_init(struct platform_device *pdev)
 	int r;
 
 	clk_data = mtk_alloc_clk_data(CLK_ETH_NR_CLK);
+	if (!clk_data)
+		return -ENOMEM;
 
 	mtk_clk_register_gates(&pdev->dev, node, eth_clks,
 			       CLK_ETH_NR_CLK, clk_data);
@@ -100,6 +102,8 @@ static int clk_mt7629_sgmiisys_init(struct platform_device *pdev)
 	int r;
 
 	clk_data = mtk_alloc_clk_data(CLK_SGMII_NR_CLK);
+	if (!clk_data)
+		return -ENOMEM;
 
 	mtk_clk_register_gates(&pdev->dev, node, sgmii_clks[id++],
 			       CLK_SGMII_NR_CLK, clk_data);
-- 
2.25.1