netdev - Re: [2.6 patch] hso_create_bulk_serial

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Date:	Sat, 13 Sep 2008 15:56:13 -0400
From:	Jeff Garzik <jgarzik@...ox.com>
To:	Adrian Bunk <bunk@...nel.org>
CC:	gregkh@...e.de, linux-usb@...r.kernel.org, netdev@...r.kernel.org
Subject: Re: [2.6 patch] hso_create_bulk_serial_device(): fix a double free

Adrian Bunk wrote:
> hso_serial_common_free() mustn't be called if
> hso_serial_common_create() fails.
> 
> Reported-by: Adrian Bunk <bunk@...nel.org>
> Signed-off-by: Adrian Bunk <bunk@...nel.org>
> 
> ---
> 
>  drivers/net/usb/hso.c |    9 +++++----
>  1 file changed, 5 insertions(+), 4 deletions(-)
> 
> d7557f8eda806e6888232bae1b86dfdd8b6cf330 
> diff --git a/drivers/net/usb/hso.c b/drivers/net/usb/hso.c
> index 1b7cac7..8c11295 100644
> --- a/drivers/net/usb/hso.c
> +++ b/drivers/net/usb/hso.c
> @@ -2206,39 +2206,40 @@ static struct hso_device *hso_create_bulk_serial_device(
>  	if (hso_serial_common_create(serial, num_urbs, BULK_URB_RX_SIZE,
>  				     BULK_URB_TX_SIZE))
>  		goto exit;
>  
>  	serial->in_endp = hso_get_ep(interface, USB_ENDPOINT_XFER_BULK,
>  				     USB_DIR_IN);
>  	if (!serial->in_endp) {
>  		dev_err(&interface->dev, "Failed to find BULK IN ep\n");
> -		goto exit;
> +		goto exit2;
>  	}
>  
>  	if (!
>  	    (serial->out_endp =
>  	     hso_get_ep(interface, USB_ENDPOINT_XFER_BULK, USB_DIR_OUT))) {
>  		dev_err(&interface->dev, "Failed to find BULK IN ep\n");
> -		goto exit;
> +		goto exit2;
>  	}
>  
>  	serial->write_data = hso_std_serial_write_data;
>  
>  	/* and record this serial */
>  	set_serial_by_index(serial->minor, serial);
>  
>  	/* setup the proc dirs and files if needed */
>  	hso_log_port(hso_dev);
>  
>  	/* done, return it */
>  	return hso_dev;
> +
> +exit2:
> +	hso_serial_common_free(serial);
>  exit:
> -	if (hso_dev && serial)
> -		hso_serial_common_free(serial);
>  	kfree(serial);
>  	hso_free_device(hso_dev);
>  	return NULL;
>  }
>  
>  /* Creates a multiplexed AT channel */
>  static

applied


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