USB: usbtmc: add missing endpoint sanity check

BugLink: http://bugs.launchpad.net/bugs/1677589
commit 687e0687f71ec00e0132a21fef802dee88c2f1ad upstream.

USBTMC devices are required to have a bulk-in and a bulk-out endpoint,
but the driver failed to verify this, something which could lead to the
endpoint addresses being taken from uninitialised memory.

Make sure to zero all private data as part of allocation, and add the
missing endpoint sanity check.

Note that this also addresses a more recently introduced issue, where
the interrupt-in-presence flag would also be uninitialised whenever the
optional interrupt-in endpoint is not present. This in turn could lead
to an interrupt urb being allocated, initialised and submitted based on
uninitialised values.

Fixes: dbf3e7f654c0 ("Implement an ioctl to support the USMTMC-USB488 READ_STATUS_BYTE operation.")
Fixes: 5b775f672cc9 ("USB: add USB test and measurement class driver")
Signed-off-by: Johan Hovold <johan@kernel.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Signed-off-by: Tim Gardner <tim.gardner@canonical.com>

diff --git a/drivers/usb/class/usbtmc.c b/drivers/usb/class/usbtmc.c
index f03692ec552056845c6fa50947e38abca47ea66b..5e3446db4513acf14bcbb489714999359b794232 100644 (file)
--- a/drivers/usb/class/usbtmc.c
+++ b/drivers/usb/class/usbtmc.c
@@ -1381,7 +1381,7 @@ static int usbtmc_probe(struct usb_interface *intf,
 
        dev_dbg(&intf->dev, "%s called\n", __func__);
 
-       data = kmalloc(sizeof(*data), GFP_KERNEL);
+       data = kzalloc(sizeof(*data), GFP_KERNEL);
        if (!data)
                return -ENOMEM;
 
@@ -1444,6 +1444,13 @@ static int usbtmc_probe(struct usb_interface *intf,
                        break;
                }
        }
+
+       if (!data->bulk_out || !data->bulk_in) {
+               dev_err(&intf->dev, "bulk endpoints not found\n");
+               retcode = -ENODEV;
+               goto err_put;
+       }
+
        /* Find int endpoint */
        for (n = 0; n < iface_desc->desc.bNumEndpoints; n++) {
                endpoint = &iface_desc->endpoint[n].desc;
@@ -1512,6 +1519,7 @@ error_register:
        sysfs_remove_group(&intf->dev.kobj, &capability_attr_grp);
        sysfs_remove_group(&intf->dev.kobj, &data_attr_grp);
        usbtmc_free_int(data);
+err_put:
        kref_put(&data->kref, usbtmc_delete);
        return retcode;
 }