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

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Date:	Thu, 6 Mar 2014 10:36:34 -0800
From:	John de la Garza <john@...ev.com>
To:	linux-kernel@...r.kernel.org
Cc:	gregkh@...uxfoundation.org, shuah.kh@...sung.com
Subject: [PATCH] usbip:vhci_sysfs.c: check return value of sscanf

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);
-- 
1.7.10.4

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