linux-kernel - Re: [PATCH] usbip:vhci_sysfs.c: check return value of sscanf

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Date:	Thu, 06 Mar 2014 13:23:09 -0700
From:	Shuah Khan <shuah.kh@...sung.com>
To:	John de la Garza <john@...ev.com>, linux-kernel@...r.kernel.org
Cc:	gregkh@...uxfoundation.org, Shuah Khan <shuah.kh@...sung.com>
Subject: Re: [PATCH] usbip:vhci_sysfs.c: check return value of sscanf

On 03/06/2014 11:36 AM, John de la Garza wrote:
> Added code to check return value of sscanf.
>
> Signed-off-by: John de la Garza <john@...ev.com>
> ---
>   drivers/staging/usbip/vhci_sysfs.c |    6 ++++--
>   1 file changed, 4 insertions(+), 2 deletions(-)
>
> diff --git a/drivers/staging/usbip/vhci_sysfs.c b/drivers/staging/usbip/vhci_sysfs.c
> index 03e6edf..82dd49f 100644
> --- a/drivers/staging/usbip/vhci_sysfs.c
> +++ b/drivers/staging/usbip/vhci_sysfs.c
> @@ -114,7 +114,8 @@ static ssize_t store_detach(struct device *dev, struct device_attribute *attr,
>   	int err;
>   	__u32 rhport = 0;
>
> -	sscanf(buf, "%u", &rhport);
> +	if (sscanf(buf, "%u", &rhport) != 1)
> +		return -EINVAL;
>
>   	/* check rhport */
>   	if (rhport >= VHCI_NPORTS) {
> @@ -182,7 +183,8 @@ static ssize_t store_attach(struct device *dev, struct device_attribute *attr,
>   	 * @devid: unique device identifier in a remote host
>   	 * @speed: usb device speed in a remote host
>   	 */
> -	sscanf(buf, "%u %u %u %u", &rhport, &sockfd, &devid, &speed);
> +	if (sscanf(buf, "%u %u %u %u", &rhport, &sockfd, &devid, &speed) != 1)
> +		return -EINVAL;
>
>   	usbip_dbg_vhci_sysfs("rhport(%u) sockfd(%u) devid(%u) speed(%u)\n",
>   			     rhport, sockfd, devid, speed);
>

Looks good to me.

Reviewed-by: Shuah Khan <shuah.kh@...sung.com>

-- Shuah

-- 
Shuah Khan
Senior Linux Kernel Developer - Open Source Group
Samsung Research America(Silicon Valley)
shuah.kh@...sung.com | (970) 672-0658
--
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