[v2] clk: imx93: fix memory leak and missing unwind goto in imx93_clocks_probe

[PATCH v2] clk: imx93: fix memory leak and missing unwind goto in imx93_clocks_probe

Posted by Zhanhao Hu 2 years, 8 months ago

In function probe(), it returns directly without unregistered hws
when error occurs.

Fix this by adding 'goto unregister_hws;' on line 295 and
line 310.

Use devm_kzalloc() instead of kzalloc() to automatically
free the memory using devm_kfree() when error occurs.

Replace of_iomap() with devm_of_iomap() to automatically
handle the unused ioremap region and delete 'iounmap(anatop_base);'
in unregister_hws.

Fixes: 24defbe194b6 ("clk: imx: add i.MX93 clk")
Signed-off-by: Zhanhao Hu <zero12113@hust.edu.cn>
---
V1 -> V2 : Rephrase commit message in imperative mood.
This issue is found by static analysis and remains untested.
---
 drivers/clk/imx/clk-imx93.c | 15 ++++++++-------
 1 file changed, 8 insertions(+), 7 deletions(-)

diff --git a/drivers/clk/imx/clk-imx93.c b/drivers/clk/imx/clk-imx93.c
index 07b4a043e449..b6c7c2725906 100644
--- a/drivers/clk/imx/clk-imx93.c
+++ b/drivers/clk/imx/clk-imx93.c
@@ -264,7 +264,7 @@ static int imx93_clocks_probe(struct platform_device *pdev)
 	void __iomem *base, *anatop_base;
 	int i, ret;
 
-	clk_hw_data = kzalloc(struct_size(clk_hw_data, hws,
+	clk_hw_data = devm_kzalloc(dev, struct_size(clk_hw_data, hws,
 					  IMX93_CLK_END), GFP_KERNEL);
 	if (!clk_hw_data)
 		return -ENOMEM;
@@ -288,10 +288,12 @@ static int imx93_clocks_probe(struct platform_device *pdev)
 								    "sys_pll_pfd2", 1, 2);
 
 	np = of_find_compatible_node(NULL, NULL, "fsl,imx93-anatop");
-	anatop_base = of_iomap(np, 0);
+	anatop_base = devm_of_iomap(dev, np, 0, NULL);
 	of_node_put(np);
-	if (WARN_ON(!anatop_base))
-		return -ENOMEM;
+	if (WARN_ON(IS_ERR(anatop_base))) {
+		ret = PTR_ERR(base);
+		goto unregister_hws;
+	}
 
 	clks[IMX93_CLK_ARM_PLL] = imx_clk_fracn_gppll_integer("arm_pll", "osc_24m",
 							      anatop_base + 0x1000,
@@ -304,8 +306,8 @@ static int imx93_clocks_probe(struct platform_device *pdev)
 	np = dev->of_node;
 	base = devm_platform_ioremap_resource(pdev, 0);
 	if (WARN_ON(IS_ERR(base))) {
-		iounmap(anatop_base);
-		return PTR_ERR(base);
+		ret = PTR_ERR(base);
+		goto unregister_hws;
 	}
 
 	for (i = 0; i < ARRAY_SIZE(root_array); i++) {
@@ -345,7 +347,6 @@ static int imx93_clocks_probe(struct platform_device *pdev)
 
 unregister_hws:
 	imx_unregister_hw_clocks(clks, IMX93_CLK_END);
-	iounmap(anatop_base);
 
 	return ret;
 }
-- 
2.34.1

Re: [PATCH v2] clk: imx93: fix memory leak and missing unwind goto in imx93_clocks_probe

Posted by Abel Vesa 2 years, 8 months ago

On Thu, 01 Jun 2023 03:38:25 +0000, Zhanhao Hu wrote:
> In function probe(), it returns directly without unregistered hws
> when error occurs.
> 
> Fix this by adding 'goto unregister_hws;' on line 295 and
> line 310.
> 
> Use devm_kzalloc() instead of kzalloc() to automatically
> free the memory using devm_kfree() when error occurs.
> 
> [...]

Applied, thanks!

[1/1] clk: imx93: fix memory leak and missing unwind goto in imx93_clocks_probe
      commit: e02ba11b457647050cb16e7cad16cec3c252fade

Best regards,
-- 
Abel Vesa <abel.vesa@linaro.org>

Re: [PATCH v2] clk: imx93: fix memory leak and missing unwind goto in imx93_clocks_probe

Posted by Abel Vesa 2 years, 8 months ago

On 23-06-01 03:38:25, Zhanhao Hu wrote:
> In function probe(), it returns directly without unregistered hws
> when error occurs.
> 
> Fix this by adding 'goto unregister_hws;' on line 295 and
> line 310.
> 
> Use devm_kzalloc() instead of kzalloc() to automatically
> free the memory using devm_kfree() when error occurs.
> 
> Replace of_iomap() with devm_of_iomap() to automatically
> handle the unused ioremap region and delete 'iounmap(anatop_base);'
> in unregister_hws.
> 
> Fixes: 24defbe194b6 ("clk: imx: add i.MX93 clk")
> Signed-off-by: Zhanhao Hu <zero12113@hust.edu.cn>

Reviewed-by: Abel Vesa <abel.vesa@linaro.org>

> ---
> V1 -> V2 : Rephrase commit message in imperative mood.
> This issue is found by static analysis and remains untested.
> ---
>  drivers/clk/imx/clk-imx93.c | 15 ++++++++-------
>  1 file changed, 8 insertions(+), 7 deletions(-)
> 
> diff --git a/drivers/clk/imx/clk-imx93.c b/drivers/clk/imx/clk-imx93.c
> index 07b4a043e449..b6c7c2725906 100644
> --- a/drivers/clk/imx/clk-imx93.c
> +++ b/drivers/clk/imx/clk-imx93.c
> @@ -264,7 +264,7 @@ static int imx93_clocks_probe(struct platform_device *pdev)
>  	void __iomem *base, *anatop_base;
>  	int i, ret;
>  
> -	clk_hw_data = kzalloc(struct_size(clk_hw_data, hws,
> +	clk_hw_data = devm_kzalloc(dev, struct_size(clk_hw_data, hws,
>  					  IMX93_CLK_END), GFP_KERNEL);
>  	if (!clk_hw_data)
>  		return -ENOMEM;
> @@ -288,10 +288,12 @@ static int imx93_clocks_probe(struct platform_device *pdev)
>  								    "sys_pll_pfd2", 1, 2);
>  
>  	np = of_find_compatible_node(NULL, NULL, "fsl,imx93-anatop");
> -	anatop_base = of_iomap(np, 0);
> +	anatop_base = devm_of_iomap(dev, np, 0, NULL);
>  	of_node_put(np);
> -	if (WARN_ON(!anatop_base))
> -		return -ENOMEM;
> +	if (WARN_ON(IS_ERR(anatop_base))) {
> +		ret = PTR_ERR(base);
> +		goto unregister_hws;
> +	}
>  
>  	clks[IMX93_CLK_ARM_PLL] = imx_clk_fracn_gppll_integer("arm_pll", "osc_24m",
>  							      anatop_base + 0x1000,
> @@ -304,8 +306,8 @@ static int imx93_clocks_probe(struct platform_device *pdev)
>  	np = dev->of_node;
>  	base = devm_platform_ioremap_resource(pdev, 0);
>  	if (WARN_ON(IS_ERR(base))) {
> -		iounmap(anatop_base);
> -		return PTR_ERR(base);
> +		ret = PTR_ERR(base);
> +		goto unregister_hws;
>  	}
>  
>  	for (i = 0; i < ARRAY_SIZE(root_array); i++) {
> @@ -345,7 +347,6 @@ static int imx93_clocks_probe(struct platform_device *pdev)
>  
>  unregister_hws:
>  	imx_unregister_hw_clocks(clks, IMX93_CLK_END);
> -	iounmap(anatop_base);
>  
>  	return ret;
>  }
> -- 
> 2.34.1
>