USB: serial: visor: handle potential invalid device configuration

If we get an invalid device configuration from a palm 3 type device, we
might incorrectly parse things, and we have the potential to crash in
"interesting" ways.

Fix this up by verifying the size of the configuration passed to us by
the device, and only if it is correct, will we handle it.

Note that this also fixes an information leak of slab data.
Reported-by: Andrey Konovalov <andreyknvl@google.com>
Reviewed-by: Andrey Konovalov <andreyknvl@google.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
[ johan: add comment about the info leak ]
Cc: stable <stable@vger.kernel.org>
Signed-off-by: Johan Hovold <johan@kernel.org>

drivers/usb/serial/visor.c

@@ -335,14 +335,25 @@ static int palm_os_3_probe(struct usb_serial *serial,
 		goto exit;
 	}
 
-	if (retval == sizeof(*connection_info)) {
-			connection_info = (struct visor_connection_info *)
-							transfer_buffer;
+	if (retval != sizeof(*connection_info)) {
+		dev_err(dev, "Invalid connection information received from device\n");
+		retval = -ENODEV;
+		goto exit;
+	}
+
+	connection_info = (struct visor_connection_info *)transfer_buffer;
 
 	num_ports = le16_to_cpu(connection_info->num_ports);
+
+	/* Handle devices that report invalid stuff here. */
+	if (num_ports == 0 || num_ports > 2) {
+		dev_warn(dev, "%s: No valid connect info available\n",
+			serial->type->description);
+		num_ports = 2;
+	}
+
 	for (i = 0; i < num_ports; ++i) {
-			switch (
-			   connection_info->connections[i].port_function_id) {
+		switch (connection_info->connections[i].port_function_id) {
 		case VISOR_FUNCTION_GENERIC:
 			string = "Generic";
 			break;
@@ -366,16 +377,6 @@ static int palm_os_3_probe(struct usb_serial *serial,
 			serial->type->description,
 			connection_info->connections[i].port, string);
 	}
-	}
-	/*
-	* Handle devices that report invalid stuff here.
-	*/
-	if (num_ports == 0 || num_ports > 2) {
-		dev_warn(dev, "%s: No valid connect info available\n",
-			serial->type->description);
-		num_ports = 2;
-	}
-
 	dev_info(dev, "%s: Number of ports: %d\n", serial->type->description,
 		num_ports);