[PATCH] clocksource/drivers/timer-atmel-pit: properly handle error cases

[PATCH] clocksource/drivers/timer-atmel-pit: properly handle error cases

[Alexandre Belloni]

smatch now reports a possible leak:

smatch warnings:
drivers/clocksource/timer-atmel-pit.c:183 at91sam926x_pit_dt_init() warn: possible memory leak of 'data'

Ensure data is freed before exiting with an error.

Reported-by: Dan Carpenter <dan.carpenter@oracle.com>
Signed-off-by: Alexandre Belloni <alexandre.belloni@bootlin.com>
---
 drivers/clocksource/timer-atmel-pit.c | 20 ++++++++++++++------
 1 file changed, 14 insertions(+), 6 deletions(-)

diff --git a/drivers/clocksource/timer-atmel-pit.c b/drivers/clocksource/timer-atmel-pit.c
index ec8a4376f74f..2fab18fae4fc 100644
--- a/drivers/clocksource/timer-atmel-pit.c
+++ b/drivers/clocksource/timer-atmel-pit.c
@@ -180,26 +180,29 @@ static int __init at91sam926x_pit_dt_init(struct device_node *node)
 	data->base = of_iomap(node, 0);
 	if (!data->base) {
 		pr_err("Could not map PIT address\n");
-		return -ENXIO;
+		ret = -ENXIO;
+		goto exit;
 	}
 
 	data->mck = of_clk_get(node, 0);
 	if (IS_ERR(data->mck)) {
 		pr_err("Unable to get mck clk\n");
-		return PTR_ERR(data->mck);
+		ret = PTR_ERR(data->mck);
+		goto exit;
 	}
 
 	ret = clk_prepare_enable(data->mck);
 	if (ret) {
 		pr_err("Unable to enable mck\n");
-		return ret;
+		goto exit;
 	}
 
 	/* Get the interrupts property */
 	data->irq = irq_of_parse_and_map(node, 0);
 	if (!data->irq) {
 		pr_err("Unable to get IRQ from DT\n");
-		return -EINVAL;
+		ret = -EINVAL;
+		goto exit;
 	}
 
 	/*
@@ -227,7 +230,7 @@ static int __init at91sam926x_pit_dt_init(struct device_node *node)
 	ret = clocksource_register_hz(&data->clksrc, pit_rate);
 	if (ret) {
 		pr_err("Failed to register clocksource\n");
-		return ret;
+		goto exit;
 	}
 
 	/* Set up irq handler */
@@ -236,7 +239,8 @@ static int __init at91sam926x_pit_dt_init(struct device_node *node)
 			  "at91_tick", data);
 	if (ret) {
 		pr_err("Unable to setup IRQ\n");
-		return ret;
+		clocksource_unregister(&data->clksrc);
+		goto exit;
 	}
 
 	/* Set up and register clockevents */
@@ -254,6 +258,10 @@ static int __init at91sam926x_pit_dt_init(struct device_node *node)
 	clockevents_register_device(&data->clkevt);
 
 	return 0;
+
+exit:
+	kfree(data);
+	return ret;
 }
 TIMER_OF_DECLARE(at91sam926x_pit, "atmel,at91sam9260-pit",
 		       at91sam926x_pit_dt_init);
-- 
2.17.0

[PATCH] clocksource/drivers/timer-atmel-pit: properly handle error cases

[Daniel Lezcano]

On Wed, Apr 25, 2018 at 12:14:39PM +0200, Alexandre Belloni wrote:
> smatch now reports a possible leak:
> 
> smatch warnings:
> drivers/clocksource/timer-atmel-pit.c:183 at91sam926x_pit_dt_init() warn: possible memory leak of 'data'
> 
> Ensure data is freed before exiting with an error.
> 
> Reported-by: Dan Carpenter <dan.carpenter@oracle.com>
> Signed-off-by: Alexandre Belloni <alexandre.belloni@bootlin.com>
> ---

Applied for 4.17-rc

-- 

 <http://www.linaro.org/> Linaro.org ? Open source software for ARM SoCs

Follow Linaro:  <http://www.facebook.com/pages/Linaro> Facebook |
<http://twitter.com/#!/linaroorg> Twitter |
<http://www.linaro.org/linaro-blog/> Blog

[PATCH] clocksource/drivers/timer-atmel-pit: properly handle error cases

[Nicolas Ferre]

Daniel,

On 01/05/2018 at 10:36, Daniel Lezcano wrote:
> On Wed, Apr 25, 2018 at 12:14:39PM +0200, Alexandre Belloni wrote:
>> smatch now reports a possible leak:
>>
>> smatch warnings:
>> drivers/clocksource/timer-atmel-pit.c:183 at91sam926x_pit_dt_init() warn: possible memory leak of 'data'
>>
>> Ensure data is freed before exiting with an error.
>>
>> Reported-by: Dan Carpenter <dan.carpenter@oracle.com>
>> Signed-off-by: Alexandre Belloni <alexandre.belloni@bootlin.com>
>> ---
> 
> Applied for 4.17-rc

We don't see it in Mainline as of 4.19-rc neither in linux-next. Has it 
been forgotten?

Thanks for your help. Best regards,
-- 
Nicolas Ferre

[PATCH] clocksource/drivers/timer-atmel-pit: properly handle error cases

[Daniel Lezcano]

On 26/09/2018 14:38, Nicolas Ferre wrote:
> Daniel,
> 
> On 01/05/2018 at 10:36, Daniel Lezcano wrote:
>> On Wed, Apr 25, 2018 at 12:14:39PM +0200, Alexandre Belloni wrote:
>>> smatch now reports a possible leak:
>>>
>>> smatch warnings:
>>> drivers/clocksource/timer-atmel-pit.c:183 at91sam926x_pit_dt_init()
>>> warn: possible memory leak of 'data'
>>>
>>> Ensure data is freed before exiting with an error.
>>>
>>> Reported-by: Dan Carpenter <dan.carpenter@oracle.com>
>>> Signed-off-by: Alexandre Belloni <alexandre.belloni@bootlin.com>
>>> ---
>>
>> Applied for 4.17-rc
> 
> We don't see it in Mainline as of 4.19-rc neither in linux-next. Has it
> been forgotten?

Yes, my bad. I thought it was merge in tip:timers/urgent

Let me resend another PR for 4.19-rc and Cc stable@




-- 
 <http://www.linaro.org/> Linaro.org ? Open source software for ARM SoCs

Follow Linaro:  <http://www.facebook.com/pages/Linaro> Facebook |
<http://twitter.com/#!/linaroorg> Twitter |
<http://www.linaro.org/linaro-blog/> Blog

[PATCH] clocksource/drivers/timer-atmel-pit: Properly handle error cases

[Daniel Lezcano]

From: Alexandre Belloni <alexandre.belloni@bootlin.com>

The smatch utility reports a possible leak:

smatch warnings:
drivers/clocksource/timer-atmel-pit.c:183 at91sam926x_pit_dt_init() warn: possible memory leak of 'data'

Ensure data is freed before exiting with an error.

Reported-by: Dan Carpenter <dan.carpenter@oracle.com>
Signed-off-by: Alexandre Belloni <alexandre.belloni@bootlin.com>
Cc: stable at vger.kernel.org
Signed-off-by: Daniel Lezcano <daniel.lezcano@linaro.org>
---
 drivers/clocksource/timer-atmel-pit.c | 20 ++++++++++++++------
 1 file changed, 14 insertions(+), 6 deletions(-)

diff --git a/drivers/clocksource/timer-atmel-pit.c b/drivers/clocksource/timer-atmel-pit.c
index ec8a437..2fab18f 100644
--- a/drivers/clocksource/timer-atmel-pit.c
+++ b/drivers/clocksource/timer-atmel-pit.c
@@ -180,26 +180,29 @@ static int __init at91sam926x_pit_dt_init(struct device_node *node)
 	data->base = of_iomap(node, 0);
 	if (!data->base) {
 		pr_err("Could not map PIT address\n");
-		return -ENXIO;
+		ret = -ENXIO;
+		goto exit;
 	}
 
 	data->mck = of_clk_get(node, 0);
 	if (IS_ERR(data->mck)) {
 		pr_err("Unable to get mck clk\n");
-		return PTR_ERR(data->mck);
+		ret = PTR_ERR(data->mck);
+		goto exit;
 	}
 
 	ret = clk_prepare_enable(data->mck);
 	if (ret) {
 		pr_err("Unable to enable mck\n");
-		return ret;
+		goto exit;
 	}
 
 	/* Get the interrupts property */
 	data->irq = irq_of_parse_and_map(node, 0);
 	if (!data->irq) {
 		pr_err("Unable to get IRQ from DT\n");
-		return -EINVAL;
+		ret = -EINVAL;
+		goto exit;
 	}
 
 	/*
@@ -227,7 +230,7 @@ static int __init at91sam926x_pit_dt_init(struct device_node *node)
 	ret = clocksource_register_hz(&data->clksrc, pit_rate);
 	if (ret) {
 		pr_err("Failed to register clocksource\n");
-		return ret;
+		goto exit;
 	}
 
 	/* Set up irq handler */
@@ -236,7 +239,8 @@ static int __init at91sam926x_pit_dt_init(struct device_node *node)
 			  "at91_tick", data);
 	if (ret) {
 		pr_err("Unable to setup IRQ\n");
-		return ret;
+		clocksource_unregister(&data->clksrc);
+		goto exit;
 	}
 
 	/* Set up and register clockevents */
@@ -254,6 +258,10 @@ static int __init at91sam926x_pit_dt_init(struct device_node *node)
 	clockevents_register_device(&data->clkevt);
 
 	return 0;
+
+exit:
+	kfree(data);
+	return ret;
 }
 TIMER_OF_DECLARE(at91sam926x_pit, "atmel,at91sam9260-pit",
 		       at91sam926x_pit_dt_init);
-- 
2.7.4