linux-kernel - [PATCH v2] ARM: imx: Check return value of devm_kasprintf in imx_mmdc_perf

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Message-Id: <20231122064636.7268-1-chentao@kylinos.cn>
Date:   Wed, 22 Nov 2023 14:46:36 +0800
From:   Kunwu Chan <chentao@...inos.cn>
To:     linux@...linux.org.uk, shawnguo@...nel.org, s.hauer@...gutronix.de,
        kernel@...gutronix.de, festevam@...il.com, linux-imx@....com,
        arnd@...db.de, angus.chen@...uarmicro.com,
        u.kleine-koenig@...gutronix.de
Cc:     linux-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org,
        kunwu.chan@...mail.com, Kunwu Chan <chentao@...inos.cn>,
        Ahmad Fatoum <a.fatoum@...gutronix.de>
Subject: [PATCH v2] ARM: imx: Check return value of devm_kasprintf in imx_mmdc_perf_init

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@...gutronix.de>
Fixes: e76bdfd7403a ("ARM: imx: Added perf functionality to mmdc driver")
Signed-off-by: Kunwu Chan <chentao@...inos.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