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From: Kunwu Chan <chentao@kylinos.cn>
To: linux@armlinux.org.uk, shawnguo@kernel.org,
	s.hauer@pengutronix.de, kernel@pengutronix.de,
	festevam@gmail.com, linux-imx@nxp.com, arnd@arndb.de,
	angus.chen@jaguarmicro.com, u.kleine-koenig@pengutronix.de
Cc: linux-arm-kernel@lists.infradead.org,
	linux-kernel@vger.kernel.org, kunwu.chan@hotmail.com,
	Kunwu Chan <chentao@kylinos.cn>,
	Ahmad Fatoum <a.fatoum@pengutronix.de>
Subject: [PATCH v2] ARM: imx: Check return value of devm_kasprintf in imx_mmdc_perf_init
Date: Wed, 22 Nov 2023 14:46:36 +0800	[thread overview]
Message-ID: <20231122064636.7268-1-chentao@kylinos.cn> (raw)

devm_kasprintf() returns a pointer to dynamically allocated memory
which can be NULL upon failure. Ensure the allocation was successful
by checking the pointer validity.

Release the id allocated in 'mmdc_pmu_init' when 'devm_kasprintf'
return NULL

Suggested-by: Ahmad Fatoum <a.fatoum@pengutronix.de>
Fixes: e76bdfd7403a ("ARM: imx: Added perf functionality to mmdc driver")
Signed-off-by: Kunwu Chan <chentao@kylinos.cn>
---
v2: Add new label to release the id allocated in 'mmdc_pmu_init'
---
 arch/arm/mach-imx/mmdc.c | 7 ++++++-
 1 file changed, 6 insertions(+), 1 deletion(-)

diff --git a/arch/arm/mach-imx/mmdc.c b/arch/arm/mach-imx/mmdc.c
index 2157493b78a9..df69af932375 100644
--- a/arch/arm/mach-imx/mmdc.c
+++ b/arch/arm/mach-imx/mmdc.c
@@ -501,6 +501,10 @@ static int imx_mmdc_perf_init(struct platform_device *pdev, void __iomem *mmdc_b
 
 	name = devm_kasprintf(&pdev->dev,
 				GFP_KERNEL, "mmdc%d", ret);
+	if (!name) {
+		ret = -ENOMEM;
+		goto pmu_release_id;
+	}
 
 	pmu_mmdc->mmdc_ipg_clk = mmdc_ipg_clk;
 	pmu_mmdc->devtype_data = (struct fsl_mmdc_devtype_data *)of_id->data;
@@ -523,9 +527,10 @@ static int imx_mmdc_perf_init(struct platform_device *pdev, void __iomem *mmdc_b
 
 pmu_register_err:
 	pr_warn("MMDC Perf PMU failed (%d), disabled\n", ret);
-	ida_simple_remove(&mmdc_ida, pmu_mmdc->id);
 	cpuhp_state_remove_instance_nocalls(cpuhp_mmdc_state, &pmu_mmdc->node);
 	hrtimer_cancel(&pmu_mmdc->hrtimer);
+pmu_release_id:
+	ida_simple_remove(&mmdc_ida, pmu_mmdc->id);
 pmu_free:
 	kfree(pmu_mmdc);
 	return ret;
-- 
2.34.1


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WARNING: multiple messages have this Message-ID (diff)
From: Kunwu Chan <chentao@kylinos.cn>
To: linux@armlinux.org.uk, shawnguo@kernel.org,
	s.hauer@pengutronix.de, kernel@pengutronix.de,
	festevam@gmail.com, linux-imx@nxp.com, arnd@arndb.de,
	angus.chen@jaguarmicro.com, u.kleine-koenig@pengutronix.de
Cc: linux-arm-kernel@lists.infradead.org,
	linux-kernel@vger.kernel.org, kunwu.chan@hotmail.com,
	Kunwu Chan <chentao@kylinos.cn>,
	Ahmad Fatoum <a.fatoum@pengutronix.de>
Subject: [PATCH v2] ARM: imx: Check return value of devm_kasprintf in imx_mmdc_perf_init
Date: Wed, 22 Nov 2023 14:46:36 +0800	[thread overview]
Message-ID: <20231122064636.7268-1-chentao@kylinos.cn> (raw)

devm_kasprintf() returns a pointer to dynamically allocated memory
which can be NULL upon failure. Ensure the allocation was successful
by checking the pointer validity.

Release the id allocated in 'mmdc_pmu_init' when 'devm_kasprintf'
return NULL

Suggested-by: Ahmad Fatoum <a.fatoum@pengutronix.de>
Fixes: e76bdfd7403a ("ARM: imx: Added perf functionality to mmdc driver")
Signed-off-by: Kunwu Chan <chentao@kylinos.cn>
---
v2: Add new label to release the id allocated in 'mmdc_pmu_init'
---
 arch/arm/mach-imx/mmdc.c | 7 ++++++-
 1 file changed, 6 insertions(+), 1 deletion(-)

diff --git a/arch/arm/mach-imx/mmdc.c b/arch/arm/mach-imx/mmdc.c
index 2157493b78a9..df69af932375 100644
--- a/arch/arm/mach-imx/mmdc.c
+++ b/arch/arm/mach-imx/mmdc.c
@@ -501,6 +501,10 @@ static int imx_mmdc_perf_init(struct platform_device *pdev, void __iomem *mmdc_b
 
 	name = devm_kasprintf(&pdev->dev,
 				GFP_KERNEL, "mmdc%d", ret);
+	if (!name) {
+		ret = -ENOMEM;
+		goto pmu_release_id;
+	}
 
 	pmu_mmdc->mmdc_ipg_clk = mmdc_ipg_clk;
 	pmu_mmdc->devtype_data = (struct fsl_mmdc_devtype_data *)of_id->data;
@@ -523,9 +527,10 @@ static int imx_mmdc_perf_init(struct platform_device *pdev, void __iomem *mmdc_b
 
 pmu_register_err:
 	pr_warn("MMDC Perf PMU failed (%d), disabled\n", ret);
-	ida_simple_remove(&mmdc_ida, pmu_mmdc->id);
 	cpuhp_state_remove_instance_nocalls(cpuhp_mmdc_state, &pmu_mmdc->node);
 	hrtimer_cancel(&pmu_mmdc->hrtimer);
+pmu_release_id:
+	ida_simple_remove(&mmdc_ida, pmu_mmdc->id);
 pmu_free:
 	kfree(pmu_mmdc);
 	return ret;
-- 
2.34.1


             reply	other threads:[~2023-11-22  6:48 UTC|newest]

Thread overview: 4+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2023-11-22  6:46 Kunwu Chan [this message]
2023-11-22  6:46 ` [PATCH v2] ARM: imx: Check return value of devm_kasprintf in imx_mmdc_perf_init Kunwu Chan
2023-12-06  1:44 ` Shawn Guo
2023-12-06  1:44   ` Shawn Guo

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