USB: serial: option: add interface-number sanity check to flag handling

Add an interface-number sanity check before testing the device flags to
avoid relying on undefined behaviour when left shifting in case a device
uses an interface number greater than or equal to BITS_PER_LONG (i.e. 64
or 32).

Reported-by: syzbot+8881b478dad0a7971f79@syzkaller.appspotmail.com
Fixes: c3a65808f04a ("USB: serial: option: reimplement interface masking")
Cc: stable@vger.kernel.org
Reviewed-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Signed-off-by: Johan Hovold <johan@kernel.org>

diff --git a/drivers/usb/serial/option.c b/drivers/usb/serial/option.c
index 2a3bfd6..c5908c4 100644 (file)
--- a/drivers/usb/serial/option.c
+++ b/drivers/usb/serial/option.c
@@ -561,6 +561,9 @@ static void option_instat_callback(struct urb *urb);
 
 /* Device flags */
 
+/* Highest interface number which can be used with NCTRL() and RSVD() */
+#define FLAG_IFNUM_MAX 7
+
 /* Interface does not support modem-control requests */
 #define NCTRL(ifnum)   ((BIT(ifnum) & 0xff) << 8)
 
@@ -2089,6 +2092,14 @@ static struct usb_serial_driver * const serial_drivers[] = {
 
 module_usb_serial_driver(serial_drivers, option_ids);
 
+static bool iface_is_reserved(unsigned long device_flags, u8 ifnum)
+{
+       if (ifnum > FLAG_IFNUM_MAX)
+               return false;
+
+       return device_flags & RSVD(ifnum);
+}
+
 static int option_probe(struct usb_serial *serial,
                        const struct usb_device_id *id)
 {
@@ -2105,7 +2116,7 @@ static int option_probe(struct usb_serial *serial,
         * the same class/subclass/protocol as the serial interfaces.  Look at
         * the Windows driver .INF files for reserved interface numbers.
         */
-       if (device_flags & RSVD(iface_desc->bInterfaceNumber))
+       if (iface_is_reserved(device_flags, iface_desc->bInterfaceNumber))
                return -ENODEV;
 
        /*
@@ -2121,6 +2132,14 @@ static int option_probe(struct usb_serial *serial,
        return 0;
 }
 
+static bool iface_no_modem_control(unsigned long device_flags, u8 ifnum)
+{
+       if (ifnum > FLAG_IFNUM_MAX)
+               return false;
+
+       return device_flags & NCTRL(ifnum);
+}
+
 static int option_attach(struct usb_serial *serial)
 {
        struct usb_interface_descriptor *iface_desc;
@@ -2136,7 +2155,7 @@ static int option_attach(struct usb_serial *serial)
 
        iface_desc = &serial->interface->cur_altsetting->desc;
 
-       if (!(device_flags & NCTRL(iface_desc->bInterfaceNumber)))
+       if (!iface_no_modem_control(device_flags, iface_desc->bInterfaceNumber))
                data->use_send_setup = 1;
 
        if (device_flags & ZLP)