linux-kernel - Re: [patch] clk: st: NULL dereference on error in st_of_clkgen_vcc

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Date:	Mon, 7 Apr 2014 15:06:04 +0200
From:	Gabriel Fernandez <gabriel.fernandez@...com>
To:	Dan Carpenter <dan.carpenter@...cle.com>,
	Mike Turquette <mturquette@...aro.org>
Cc:	Pankaj Dev <pankaj.dev@...com>, <linux-kernel@...r.kernel.org>,
	<kernel-janitors@...r.kernel.org>
Subject: Re: [patch] clk: st: NULL dereference on error in st_of_clkgen_vcc_setup()

Thanks Dan,
i m agree with patch.

Best Regards.

Gabriel

On 04/07/2014 08:30 AM, Dan Carpenter wrote:
> There are two allocations where, if they fail, then we end up
> dereferencing the NULL pointer in the error handling code.
>
> Fixes: 94885faf9dbc ('clk: st: Support for DIVMUX and PreDiv Clocks')
> Signed-off-by: Dan Carpenter <dan.carpenter@...cle.com>
>
> diff --git a/drivers/clk/st/clkgen-mux.c b/drivers/clk/st/clkgen-mux.c
> index a329906..10899bc 100644
> --- a/drivers/clk/st/clkgen-mux.c
> +++ b/drivers/clk/st/clkgen-mux.c
> @@ -714,14 +714,14 @@ void __init st_of_clkgen_vcc_setup(struct device_node *np)
>   
>   	clk_data = kzalloc(sizeof(*clk_data), GFP_KERNEL);
>   	if (!clk_data)
> -		goto err;
> +		goto err_free_parents;
>   
>   	clk_data->clk_num = VCC_MAX_CHANNELS;
>   	clk_data->clks = kzalloc(clk_data->clk_num * sizeof(struct clk *),
>   				 GFP_KERNEL);
>   
>   	if (!clk_data->clks)
> -		goto err;
> +		goto err_free_data;
>   
>   	for (i = 0; i < clk_data->clk_num; i++) {
>   		struct clk *clk;
> @@ -811,10 +811,11 @@ err:
>   		kfree(container_of(composite->mux_hw, struct clk_mux, hw));
>   	}
>   
> -	if (clk_data)
> -		kfree(clk_data->clks);
> +	kfree(clk_data->clks);
>   
> +err_free_data:
>   	kfree(clk_data);
> +err_free_parents:
>   	kfree(parents);
>   }
>   CLK_OF_DECLARE(clkgen_vcc, "st,clkgen-vcc", st_of_clkgen_vcc_setup);

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