Re: [PATCH] rtc: sun6i: ensure clk_data is kfree'd on error

[Alexandre Belloni <alexandre.belloni@free-electrons.com>]

On 19/07/2017 at 18:48:27 +0100, Colin Ian King wrote:
> 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@canonical.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.
> 

Actually, I'm taking your patch now because it is the correct thing to
do.

> > 
> >> Signed-off-by: Colin Ian King <colin.king@canonical.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
> >>
> > 
> 

-- 
Alexandre Belloni, Free Electrons
Embedded Linux and Kernel engineering
http://free-electrons.com