USB: visor: fix null-deref at probe

[ Upstream commit cac9b50b0d75a1d50d6c056ff65c005f3224c8e0 ]

Fix null-pointer dereference at probe should a (malicious) Treo device
lack the expected endpoints.

Specifically, the Treo port-setup hack was dereferencing the bulk-in and
interrupt-in urbs without first making sure they had been allocated by
core.

Fixes: 1da177e4c3f4 ("Linux-2.6.12-rc2")
Cc: stable <stable@vger.kernel.org>
Signed-off-by: Johan Hovold <johan@kernel.org>
Signed-off-by: Sasha Levin <sasha.levin@oracle.com>

diff --git a/drivers/usb/serial/visor.c b/drivers/usb/serial/visor.c
index 60afb39..c53fbb3 100644 (file)
--- a/drivers/usb/serial/visor.c
+++ b/drivers/usb/serial/visor.c
@@ -544,6 +544,11 @@ static int treo_attach(struct usb_serial *serial)
                (serial->num_interrupt_in == 0))
                return 0;
 
+       if (serial->num_bulk_in < 2 || serial->num_interrupt_in < 2) {
+               dev_err(&serial->interface->dev, "missing endpoints\n");
+               return -ENODEV;
+       }
+
        /*
        * It appears that Treos and Kyoceras want to use the
        * 1st bulk in endpoint to communicate with the 2nd bulk out endpoint,