linux-kernel - Re: [PATCH] clk: imx: clk-imx8mn: fix memory leak in imx8mn_clocks

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Date:   Wed, 12 Apr 2023 17:07:22 +0800
From:   Peng Fan <peng.fan@....nxp.com>
To:     Hao Luo <m202171776@...t.edu.cn>, Abel Vesa <abelvesa@...nel.org>,
        Peng Fan <peng.fan@....com>,
        Michael Turquette <mturquette@...libre.com>,
        Stephen Boyd <sboyd@...nel.org>,
        Shawn Guo <shawnguo@...nel.org>,
        Sascha Hauer <s.hauer@...gutronix.de>,
        Pengutronix Kernel Team <kernel@...gutronix.de>,
        Fabio Estevam <festevam@...il.com>,
        NXP Linux Team <linux-imx@....com>,
        Anson Huang <Anson.Huang@....com>
Cc:     hust-os-kernel-patches@...glegroups.com,
        Dongliang Mu <dzm91@...t.edu.cn>, linux-clk@...r.kernel.org,
        linux-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH] clk: imx: clk-imx8mn: fix memory leak in
 imx8mn_clocks_probe



On 4/11/2023 9:51 AM, Hao Luo wrote:
> Use devm_of_iomap() instead of of_iomap() to automatically handle
> the unused ioremap region.
> 
> If any error occurs, regions allocated by kzalloc() will leak,
> but using devm_kzalloc() instead will automatically free the memory
> using devm_kfree().
> 
> Fixes: daeb14545514 ("clk: imx: imx8mn: Switch to clk_hw based API")
> Fixes: 96d6392b54db ("clk: imx: Add support for i.MX8MN clock driver")
> Signed-off-by: Hao Luo <m202171776@...t.edu.cn>
> Reviewed-by: Dongliang Mu <dzm91@...t.edu.cn>

LGTM: Reviewed-by: Peng Fan <peng.fan@....com>

> ---
> The issue is discovered by static analysis, and the patch is not tested yet.

Please add Version change log in future patches.

Regards,
Peng.

> ---
>   drivers/clk/imx/clk-imx8mn.c | 8 ++++----
>   1 file changed, 4 insertions(+), 4 deletions(-)
> 
> diff --git a/drivers/clk/imx/clk-imx8mn.c b/drivers/clk/imx/clk-imx8mn.c
> index a042ed3a9d6c..569b2abf4052 100644
> --- a/drivers/clk/imx/clk-imx8mn.c
> +++ b/drivers/clk/imx/clk-imx8mn.c
> @@ -323,7 +323,7 @@ static int imx8mn_clocks_probe(struct platform_device *pdev)
>   	void __iomem *base;
>   	int ret;
>   
> -	clk_hw_data = kzalloc(struct_size(clk_hw_data, hws,
> +	clk_hw_data = devm_kzalloc(dev, struct_size(clk_hw_data, hws,
>   					  IMX8MN_CLK_END), GFP_KERNEL);
>   	if (WARN_ON(!clk_hw_data))
>   		return -ENOMEM;
> @@ -340,10 +340,10 @@ static int imx8mn_clocks_probe(struct platform_device *pdev)
>   	hws[IMX8MN_CLK_EXT4] = imx_get_clk_hw_by_name(np, "clk_ext4");
>   
>   	np = of_find_compatible_node(NULL, NULL, "fsl,imx8mn-anatop");
> -	base = of_iomap(np, 0);
> +	base = devm_of_iomap(dev, np, 0, NULL);
>   	of_node_put(np);
> -	if (WARN_ON(!base)) {
> -		ret = -ENOMEM;
> +	if (WARN_ON(IS_ERR(base))) {
> +		ret = PTR_ERR(base);
>   		goto unregister_hws;
>   	}
>