linux-kernel - Re: [PATCH] rtc: sun6i: ensure clk

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Date:   Wed, 19 Jul 2017 18:48:27 +0100
From:   Colin Ian King <colin.king@...onical.com>
To:     Alexandre Belloni <alexandre.belloni@...e-electrons.com>
Cc:     Alessandro Zummo <a.zummo@...ertech.it>,
        Maxime Ripard <maxime.ripard@...e-electrons.com>,
        Chen-Yu Tsai <wens@...e.org>, linux-rtc@...r.kernel.org,
        linux-arm-kernel@...ts.infradead.org,
        kernel-janitors@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH] rtc: sun6i: ensure clk_data is kfree'd on error

On 19/07/17 18:32, Alexandre Belloni wrote:
> Hi,
> 
> On 19/07/2017 at 17:57:02 +0100, Colin King wrote:
>> From: Colin Ian King <colin.king@...onical.com>
>>
>> There are two error return paths that do not kfree clk_data and
>> we end up with a memory leak. Fix these with a kfree error exit
>> path.
>>
>> Detected by CoverityScan, CID#1402959 ("Resource Leak")
>>
> 
> I think that patch fixes the same issue (and more):
> http://patchwork.ozlabs.org/patch/787151/

Yep, that's true.

> 
>> Signed-off-by: Colin Ian King <colin.king@...onical.com>
>> ---
>>  drivers/rtc/rtc-sun6i.c | 8 ++++++--
>>  1 file changed, 6 insertions(+), 2 deletions(-)
>>
>> diff --git a/drivers/rtc/rtc-sun6i.c b/drivers/rtc/rtc-sun6i.c
>> index 39cbc1238b92..61502221ab6e 100644
>> --- a/drivers/rtc/rtc-sun6i.c
>> +++ b/drivers/rtc/rtc-sun6i.c
>> @@ -204,7 +204,7 @@ static void __init sun6i_rtc_clk_init(struct device_node *node)
>>  	rtc->base = of_io_request_and_map(node, 0, of_node_full_name(node));
>>  	if (IS_ERR(rtc->base)) {
>>  		pr_crit("Can't map RTC registers");
>> -		return;
>> +		goto err;
>>  	}
>>  
>>  	/* Switch to the external, more precise, oscillator */
>> @@ -216,7 +216,7 @@ static void __init sun6i_rtc_clk_init(struct device_node *node)
>>  
>>  	/* Deal with old DTs */
>>  	if (!of_get_property(node, "clocks", NULL))
>> -		return;
>> +		goto err;
>>  
>>  	rtc->int_osc = clk_hw_register_fixed_rate_with_accuracy(NULL,
>>  								"rtc-int-osc",
>> @@ -246,6 +246,10 @@ static void __init sun6i_rtc_clk_init(struct device_node *node)
>>  	clk_data->num = 1;
>>  	clk_data->hws[0] = &rtc->hw;
>>  	of_clk_add_hw_provider(node, of_clk_hw_onecell_get, clk_data);
>> +	return;
>> +
>> +err:
>> +	kfree(clk_data);
>>  }
>>  CLK_OF_DECLARE_DRIVER(sun6i_rtc_clk, "allwinner,sun6i-a31-rtc",
>>  		      sun6i_rtc_clk_init);
>> -- 
>> 2.11.0
>>
>