linux-kernel - Re: [PATCH] clk: imx: scu: fix a potential memory leak in __imx_clk_gpr

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Message-ID: <YlAiqhRf1p+svR1O@abelvesa>
Date:   Fri, 8 Apr 2022 14:55:22 +0300
From:   Abel Vesa <abel.vesa@....com>
To:     xkernel.wang@...mail.com
Cc:     mturquette@...libre.com, sboyd@...nel.org, shawnguo@...nel.org,
        s.hauer@...gutronix.de, kernel@...gutronix.de, festevam@...il.com,
        linux-imx@....com, linux-clk@...r.kernel.org,
        linux-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH] clk: imx: scu: fix a potential memory leak in
 __imx_clk_gpr_scu()

On 22-04-07 15:37:22, xkernel.wang@...mail.com wrote:
> From: Xiaoke Wang <xkernel.wang@...mail.com>
>
> In __imx_clk_gpr_scu(), if imx_scu_clk_is_valid(rsrc_id) fails, then
> `clk_node` which is allocated by kzalloc() is not properly released,
> which may lead to memory leak.
> So this patch added kfree(clk_node) on the above error path before
> return ERR_PTR(-EINVAL).
>
> Signed-off-by: Xiaoke Wang <xkernel.wang@...mail.com>

Reviewed-by: Abel Vesa <abel.vesa@....com>

> ---
>  drivers/clk/imx/clk-scu.c | 4 +++-
>  1 file changed, 3 insertions(+), 1 deletion(-)
>
> diff --git a/drivers/clk/imx/clk-scu.c b/drivers/clk/imx/clk-scu.c
> index 083da31..ed3c01d 100644
> --- a/drivers/clk/imx/clk-scu.c
> +++ b/drivers/clk/imx/clk-scu.c
> @@ -837,8 +837,10 @@ struct clk_hw *__imx_clk_gpr_scu(const char *name, const char * const *parent_na
>  	if (!clk_node)
>  		return ERR_PTR(-ENOMEM);
>
> -	if (!imx_scu_clk_is_valid(rsrc_id))
> +	if (!imx_scu_clk_is_valid(rsrc_id)) {
> +		kfree(clk_node);
>  		return ERR_PTR(-EINVAL);
> +	}
>
>  	clk = kzalloc(sizeof(*clk), GFP_KERNEL);
>  	if (!clk) {
> --