linux-kernel - Re: [PATCH] Double-free in cx23885

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Date:	Sat, 13 Oct 2007 11:46:42 -0400
From:	Steven Toth <stoth@...ppauge.com>
To:	Florin Malita <fmalita@...il.com>
Cc:	"mchehab@...radead.org" <mchehab@...radead.org>,
	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH] Double-free in cx23885_initdev [sls][spam-bayes]

Thanks for the patch, much appreciated.

- Steve

Florin Malita wrote:
> Both cx23885_initdev and cx23885_dev_setup free the device in their 
> error path so a failure in the latter causes a double-free. Since 
> cx23885_dev_setup is only called from cx23885_initdev, it should be safe 
> to remove its deallocation and leave the cleanup up to the allocating 
> function.
>
> Coverity CID 1922.
>
> Signed-off-by: Florin Malita <fmalita@...il.com>
> ---
>
>  drivers/media/video/cx23885/cx23885-core.c |    6 +-----
>  1 file changed, 1 insertion(+), 5 deletions(-)
>
> diff --git a/drivers/media/video/cx23885/cx23885-core.c b/drivers/media/video/cx23885/cx23885-core.c
> index af16505..3cdd136 100644
> --- a/drivers/media/video/cx23885/cx23885-core.c
> +++ b/drivers/media/video/cx23885/cx23885-core.c
> @@ -793,7 +793,7 @@ static int cx23885_dev_setup(struct cx23885_dev *dev)
>  		       dev->pci->subsystem_device);
>  
>  		cx23885_devcount--;
> -		goto fail_free;
> +		return -ENODEV;
>  	}
>  
>  	/* PCIe stuff */
> @@ -835,10 +835,6 @@ static int cx23885_dev_setup(struct cx23885_dev *dev)
>  	}
>  
>  	return 0;
> -
> -fail_free:
> -	kfree(dev);
> -	return -ENODEV;
>  }
>  
>  void cx23885_dev_unregister(struct cx23885_dev *dev)
>
>   

-
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