linux-kernel - Re: [PATCH] clk: imx: Add check for kcalloc

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Date:   Fri, 8 Apr 2022 14:49:33 +0300
From:   Abel Vesa <abel.vesa@....com>
To:     Jiasheng Jiang <jiasheng@...as.ac.cn>
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: Add check for kcalloc

On 22-03-10 16:02:57, Jiasheng Jiang wrote:
> As the potential failure of the kcalloc(),
> it should be better to check it in order to
> avoid the dereference of the NULL pointer.
>
> Fixes: 379c9a24cc23 ("clk: imx: Fix reparenting of UARTs not associated with stdout")
> Signed-off-by: Jiasheng Jiang <jiasheng@...as.ac.cn>

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

> ---
>  drivers/clk/imx/clk.c | 2 ++
>  1 file changed, 2 insertions(+)
>
> diff --git a/drivers/clk/imx/clk.c b/drivers/clk/imx/clk.c
> index 7cc669934253..99249ab361d2 100644
> --- a/drivers/clk/imx/clk.c
> +++ b/drivers/clk/imx/clk.c
> @@ -173,6 +173,8 @@ void imx_register_uart_clocks(unsigned int clk_count)
>  		int i;
>
>  		imx_uart_clocks = kcalloc(clk_count, sizeof(struct clk *), GFP_KERNEL);
> +		if (!imx_uart_clocks)
> +			return;
>
>  		if (!of_stdout)
>  			return;
> --
> 2.25.1
>