linux-kernel - Re: [PATCH] mem leak fixes for AMD 5536 UDC high/full speed USB device controller driver

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Date:	Wed, 26 Mar 2008 13:59:46 +0100
From:	Thomas Dahlmann <thomas.dahlmann@....com>
To:	Jesper Juhl <jesper.juhl@...il.com>
CC:	LKML <linux-kernel@...r.kernel.org>, linux-usb@...r.kernel.org
Subject: Re: [PATCH] mem leak fixes for AMD 5536 UDC high/full speed USB device
 controller driver

ACK, thanks.

While testing some of these error cases I found that
there is even some more improvement possible which
I will have to do e.g. changing udc_pci_remove().

Thomas

Jesper Juhl wrote:
> In drivers/usb/gadget/amd5536udc.c::udc_pci_probe(),
> sizeof(struct udc) storage is allocated for 'dev'.
>
> There are many exit points from the function where
> 'dev' is not free'd but has also not yet been used
> for anything. The following patch free's 'dev' at the
> return points where it has not yet been used.
>
> Please consider applying.
>
>
> Signed-off-by: Jesper Juhl <jesper.juhl@...il.com>
> ---
>
>  amd5536udc.c |   10 ++++++++++
>  1 file changed, 10 insertions(+)
>
> diff --git a/drivers/usb/gadget/amd5536udc.c b/drivers/usb/gadget/amd5536udc.c
> index b663f23..fc6f348 100644
> --- a/drivers/usb/gadget/amd5536udc.c
> +++ b/drivers/usb/gadget/amd5536udc.c
> @@ -3248,6 +3248,8 @@ static int udc_pci_probe(
>  
>  	/* pci setup */
>  	if (pci_enable_device(pdev) < 0) {
> +		kfree(dev);
> +		dev = 0;
>  		retval = -ENODEV;
>  		goto finished;
>  	}
> @@ -3259,6 +3261,8 @@ static int udc_pci_probe(
>  
>  	if (!request_mem_region(resource, len, name)) {
>  		dev_dbg(&pdev->dev, "pci device used already\n");
> +		kfree(dev);
> +		dev = 0;
>  		retval = -EBUSY;
>  		goto finished;
>  	}
> @@ -3267,18 +3271,24 @@ static int udc_pci_probe(
>  	dev->virt_addr = ioremap_nocache(resource, len);
>  	if (dev->virt_addr == NULL) {
>  		dev_dbg(&pdev->dev, "start address cannot be mapped\n");
> +		kfree(dev);
> +		dev = 0;
>  		retval = -EFAULT;
>  		goto finished;
>  	}
>  
>  	if (!pdev->irq) {
>  		dev_err(&dev->pdev->dev, "irq not set\n");
> +		kfree(dev);
> +		dev = 0;
>  		retval = -ENODEV;
>  		goto finished;
>  	}
>  
>  	if (request_irq(pdev->irq, udc_irq, IRQF_SHARED, name, dev) != 0) {
>  		dev_dbg(&dev->pdev->dev, "request_irq(%d) fail\n", pdev->irq);
> +		kfree(dev);
> +		dev = 0;
>  		retval = -EBUSY;
>  		goto finished;
>  	}
>
>
>
>
>   


-- 
Thomas Dahlmann
Software Engineer
AMD, Customer Support Services
voice: (+49 351) 277-6017
fax  : (+49 351) 277-96017
email: Thomas.Dahlmann@....com
http://www.amd.com

AMD Saxony Limited Liability Company & Co. KG
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Registergericht Dresden: HRA 4896
Vertretungsberechtigter Komplementär: AMD Saxony LLC (Sitz Wilmington, Delaware, USA)
Geschäftsführer der AMD Saxony LLC: Dr. Hans-R. Deppe, Thomas McCoy


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