linux-kernel - Re: [PATCH] ARM: imx: Check return value of devm_kasprintf in imx_mmdc_perf

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Message-ID: <fb963c37-db12-0f1c-c9a6-d67095ccaba1@pengutronix.de>
Date:   Tue, 21 Nov 2023 10:37:36 +0100
From:   Ahmad Fatoum <a.fatoum@...gutronix.de>
To:     Kunwu Chan <chentao@...inos.cn>, linux@...linux.org.uk,
        shawnguo@...nel.org, s.hauer@...gutronix.de, kernel@...gutronix.de,
        festevam@...il.com, linux-imx@....com, angus.chen@...uarmicro.com,
        arnd@...db.de, u.kleine-koenig@...gutronix.de
Cc:     linux-kernel@...r.kernel.org, linux-arm-kernel@...ts.infradead.org,
        kunwu.chan@...mail.com
Subject: Re: [PATCH] ARM: imx: Check return value of devm_kasprintf in
 imx_mmdc_perf_init

Hello Kunwu,

On 21.11.23 10:25, Kunwu Chan wrote:
> devm_kasprintf() returns a pointer to dynamically allocated memory
> which can be NULL upon failure. Ensure the allocation was successful
> by checking the pointer validity.
> 
> Fixes: ebeb49f43c89 ("ARM: imx: Call ida_simple_remove() for ida_simple_get")

This commit only moves the allocation around, but it didn't introduce it.
Please reference the first commit that added the allocation.

> Signed-off-by: Kunwu Chan <chentao@...inos.cn>
> ---
>  arch/arm/mach-imx/mmdc.c | 4 ++++
>  1 file changed, 4 insertions(+)
> 
> diff --git a/arch/arm/mach-imx/mmdc.c b/arch/arm/mach-imx/mmdc.c
> index 2157493b78a9..7c471d6a851d 100644
> --- a/arch/arm/mach-imx/mmdc.c
> +++ b/arch/arm/mach-imx/mmdc.c
> @@ -501,6 +501,10 @@ static int imx_mmdc_perf_init(struct platform_device *pdev, void __iomem *mmdc_b
>  
>  	name = devm_kasprintf(&pdev->dev,
>  				GFP_KERNEL, "mmdc%d", ret);
> +	if (!name) {
> +		ret = -ENOMEM;
> +		goto pmu_free;

Cleanup is incomplete if you goto pmu_free, e.g. ida_simple_remove()
isn't called. pmu_register_err does too much cleanup, so you'll need
to add a new cleanup label.

Cheers,
Ahmad


> +	}
>  
>  	pmu_mmdc->mmdc_ipg_clk = mmdc_ipg_clk;
>  	pmu_mmdc->devtype_data = (struct fsl_mmdc_devtype_data *)of_id->data;

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