linux-kernel - Re: [PATCH] clk: mediatek: clk-mt2701: Add check for mtk_alloc_clk

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Date:   Mon, 4 Sep 2023 11:48:02 +0200
From:   Markus Schneider-Pargmann <msp@...libre.com>
To:     Jiasheng Jiang <jiasheng@...as.ac.cn>
Cc:     mturquette@...libre.com, sboyd@...nel.org, matthias.bgg@...il.com,
        angelogioacchino.delregno@...labora.com, wenst@...omium.org,
        frank.li@...o.com, robh@...nel.org, jamesjj.liao@...iatek.com,
        shunli.wang@...iatek.com, erin.lo@...iatek.com,
        linux-clk@...r.kernel.org, linux-kernel@...r.kernel.org,
        linux-arm-kernel@...ts.infradead.org,
        linux-mediatek@...ts.infradead.org
Subject: Re: [PATCH] clk: mediatek: clk-mt2701: Add check for
 mtk_alloc_clk_data

On Fri, Sep 01, 2023 at 10:46:58AM +0800, Jiasheng Jiang wrote:
> Add the check for the return value of mtk_alloc_clk_data() in order to
> avoid NULL pointer dereference.
> 
> Fixes: e9862118272a ("clk: mediatek: Add MT2701 clock support")
> Signed-off-by: Jiasheng Jiang <jiasheng@...as.ac.cn>

Reviewed-by: Markus Schneider-Pargmann <msp@...libre.com>

Best,
Markus

> ---
>  drivers/clk/mediatek/clk-mt2701.c | 8 ++++++++
>  1 file changed, 8 insertions(+)
> 
> diff --git a/drivers/clk/mediatek/clk-mt2701.c b/drivers/clk/mediatek/clk-mt2701.c
> index c81f3e33ce56..12d9560eb4ba 100644
> --- a/drivers/clk/mediatek/clk-mt2701.c
> +++ b/drivers/clk/mediatek/clk-mt2701.c
> @@ -667,6 +667,8 @@ static int mtk_topckgen_init(struct platform_device *pdev)
>  		return PTR_ERR(base);
>  
>  	clk_data = mtk_alloc_clk_data(CLK_TOP_NR);
> +	if (!clk_data)
> +		return -ENOMEM;
>  
>  	mtk_clk_register_fixed_clks(top_fixed_clks, ARRAY_SIZE(top_fixed_clks),
>  								clk_data);
> @@ -747,6 +749,8 @@ static void __init mtk_infrasys_init_early(struct device_node *node)
>  
>  	if (!infra_clk_data) {
>  		infra_clk_data = mtk_alloc_clk_data(CLK_INFRA_NR);
> +		if (!infra_clk_data)
> +			return;
>  
>  		for (i = 0; i < CLK_INFRA_NR; i++)
>  			infra_clk_data->hws[i] = ERR_PTR(-EPROBE_DEFER);
> @@ -774,6 +778,8 @@ static int mtk_infrasys_init(struct platform_device *pdev)
>  
>  	if (!infra_clk_data) {
>  		infra_clk_data = mtk_alloc_clk_data(CLK_INFRA_NR);
> +		if (!infra_clk_data)
> +			return -ENOMEM;
>  	} else {
>  		for (i = 0; i < CLK_INFRA_NR; i++) {
>  			if (infra_clk_data->hws[i] == ERR_PTR(-EPROBE_DEFER))
> @@ -890,6 +896,8 @@ static int mtk_pericfg_init(struct platform_device *pdev)
>  		return PTR_ERR(base);
>  
>  	clk_data = mtk_alloc_clk_data(CLK_PERI_NR);
> +	if (!clk_data)
> +		return -ENOMEM;
>  
>  	mtk_clk_register_gates(&pdev->dev, node, peri_clks,
>  			       ARRAY_SIZE(peri_clks), clk_data);
> -- 
> 2.25.1
>