linux-kernel - Re: [PATCH 3/3] usb: gadget: mass_storage: require backing file for non-removable LUNs

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Date:	Tue, 19 Jun 2012 15:12:16 +0400
From:	Sergei Shtylyov <sshtylyov@...sta.com>
To:	Michal Nazarewicz <mpn@...gle.com>
CC:	Felipe Balbi <balbi@...com>,
	Alan Stern <stern@...land.harvard.edu>,
	linux-usb@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH 3/3] usb: gadget: mass_storage: require backing file for
 non-removable LUNs

Hello.

On 18-06-2012 16:37, Michal Nazarewicz wrote:

> From: Michal Nazarewicz<mina86@...a86.com>

> The fsg_file_store()

    Apparently, fsg_store_file(), judging by the patch itself.

> function does not check whether a LUN is removable or not
> allowing one to specify an empty file name for a non-removable LUN.  This
> commit adds explicit check of whether a file name is provided for
> non-removable LUNs.

> Signed-off-by: Michal Nazarewicz<mina86@...a86.com>
> ---
>   drivers/usb/gadget/storage_common.c |    3 +++
>   1 files changed, 3 insertions(+), 0 deletions(-)

> diff --git a/drivers/usb/gadget/storage_common.c b/drivers/usb/gadget/storage_common.c
> index e576678..52334d7 100644
> --- a/drivers/usb/gadget/storage_common.c
> +++ b/drivers/usb/gadget/storage_common.c
> @@ -878,6 +878,9 @@ static ssize_t fsg_store_file(struct device *dev, struct device_attribute *attr,
>   	if (count > 0 && buf[count-1] == '\n')
>   		((char *) buf)[count-1] = 0;		/* Ugh! */
>
> +	/* Must specify a valid file if LUN is not removable. */
> +	if (!curlun->removable&&  !*buf)
> +		return -EINVAL;

WBR, Sergei
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