usbip: Fix sscanf handling

Scan only to the length permitted by the buffer

One of a set of sscanf problems noted by Jackie Chang
Signed-off-by: Alan Cox <alan@linux.intel.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

drivers/staging/usbip/userspace/libsrc/usbip_common.c

@@ -165,7 +165,7 @@ int read_attr_speed(struct sysfs_device *dev)
 		goto err;
 	}
 
-	ret = sscanf(attr->value, "%s\n", speed);
+	ret = sscanf(attr->value, "%99s\n", speed);
 	if (ret < 1) {
 		dbg("sscanf failed");
 		goto err;

drivers/staging/usbip/userspace/libsrc/vhci_driver.c

@@ -72,7 +72,7 @@ static int parse_status(char *value)
 		unsigned long socket;
 		char lbusid[SYSFS_BUS_ID_SIZE];
 
-		ret = sscanf(c, "%d %d %d %x %lx %s\n",
+		ret = sscanf(c, "%d %d %d %x %lx %31s\n",
 				&port, &status, &speed,
 				&devid, &socket, lbusid);