2020-10-20 09:38:02

by Dinghao Liu

Subject: [PATCH] [v3] rtc: sun6i: Fix memleak in sun6i_rtc_clk_init

When clk_hw_register_fixed_rate_with_accuracy() fails,
clk_data should be freed. It's the same for the subsequent
two error paths, but we should also unregister the already
registered clocks in them.

Signed-off-by: Dinghao Liu <[email protected]>
---

Changelog:

v2: - Unregister the already registered clocks on failure.

v3: - Add a new label 'err_register' to unify code style.
---
drivers/rtc/rtc-sun6i.c | 8 +++++---
1 file changed, 5 insertions(+), 3 deletions(-)

diff --git a/drivers/rtc/rtc-sun6i.c b/drivers/rtc/rtc-sun6i.c
index e2b8b150bcb4..f2818cdd11d8 100644
--- a/drivers/rtc/rtc-sun6i.c
+++ b/drivers/rtc/rtc-sun6i.c
@@ -272,7 +272,7 @@ static void __init sun6i_rtc_clk_init(struct device_node *node,
300000000);
if (IS_ERR(rtc->int_osc)) {
pr_crit("Couldn't register the internal oscillator\n");
- return;
+ goto err;
}

parents[0] = clk_hw_get_name(rtc->int_osc);
@@ -290,7 +290,7 @@ static void __init sun6i_rtc_clk_init(struct device_node *node,
rtc->losc = clk_register(NULL, &rtc->hw);
if (IS_ERR(rtc->losc)) {
pr_crit("Couldn't register the LOSC clock\n");
- return;
+ goto err_register;
}

of_property_read_string_index(node, "clock-output-names", 1,
@@ -301,7 +301,7 @@ static void __init sun6i_rtc_clk_init(struct device_node *node,
&rtc->lock);
if (IS_ERR(rtc->ext_losc)) {
pr_crit("Couldn't register the LOSC external gate\n");
- return;
+ goto err_register;
}

clk_data->num = 2;
@@ -314,6 +314,8 @@ static void __init sun6i_rtc_clk_init(struct device_node *node,
of_clk_add_hw_provider(node, of_clk_hw_onecell_get, clk_data);
return;

+err_register:
+ clk_hw_unregister_fixed_rate(rtc->int_osc);
err:
kfree(clk_data);
}
--
2.17.1

2020-10-29 08:46:19

by Alexandre Belloni

Subject: Re: [PATCH] [v3] rtc: sun6i: Fix memleak in sun6i_rtc_clk_init

On Tue, 20 Oct 2020 14:12:26 +0800, Dinghao Liu wrote:
> When clk_hw_register_fixed_rate_with_accuracy() fails,
> clk_data should be freed. It's the same for the subsequent
> two error paths, but we should also unregister the already
> registered clocks in them.

Applied, thanks!

[1/1] rtc: sun6i: Fix memleak in sun6i_rtc_clk_init
commit: 28d211919e422f58c1e6c900e5810eee4f1ce4c8

Best regards,
--
Alexandre Belloni <[email protected]>

2020-10-29 08:50:25

by Maxime Ripard

Subject: Re: [PATCH] [v3] rtc: sun6i: Fix memleak in sun6i_rtc_clk_init

On Tue, Oct 20, 2020 at 02:12:26PM +0800, Dinghao Liu wrote:
> When clk_hw_register_fixed_rate_with_accuracy() fails,
> clk_data should be freed. It's the same for the subsequent
> two error paths, but we should also unregister the already
> registered clocks in them.
>
> Signed-off-by: Dinghao Liu <[email protected]>

Acked-by: Maxime Ripard <[email protected]>

Maxime