USB: usbtmc: add missing endpoint sanity check

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>
[ johan: backport to v4.4 ]
Signed-off-by: Johan Hovold <johan@kernel.org>
Signed-off-by: Willy Tarreau <w@1wt.eu>

diff --git a/drivers/usb/class/usbtmc.c b/drivers/usb/class/usbtmc.c
index 4c5506ae5e450db8a0977a618eb5e697bd6be1d0..64317898a7cbf6a35f17e6d3a6db12655efb437c 100644 (file)
--- a/drivers/usb/class/usbtmc.c
+++ b/drivers/usb/class/usbtmc.c
@@ -989,7 +989,7 @@ static int usbtmc_probe(struct usb_interface *intf,
 
        dev_dbg(&intf->dev, "%s called\n", __func__);
 
-       data = kmalloc(sizeof(struct usbtmc_device_data), GFP_KERNEL);
+       data = kzalloc(sizeof(struct usbtmc_device_data), GFP_KERNEL);
        if (!data) {
                dev_err(&intf->dev, "Unable to allocate kernel memory\n");
                return -ENOMEM;
@@ -1035,6 +1035,12 @@ static int usbtmc_probe(struct usb_interface *intf,
                }
        }
 
+       if (!data->bulk_out || !data->bulk_in) {
+               dev_err(&intf->dev, "bulk endpoints not found\n");
+               retcode = -ENODEV;
+               goto err_put;
+       }
+
        retcode = get_capabilities(data);
        if (retcode)
                dev_err(&intf->dev, "can't read capabilities\n");
@@ -1058,6 +1064,7 @@ static int usbtmc_probe(struct usb_interface *intf,
 error_register:
        sysfs_remove_group(&intf->dev.kobj, &capability_attr_grp);
        sysfs_remove_group(&intf->dev.kobj, &data_attr_grp);
+err_put:
        kref_put(&data->kref, usbtmc_delete);
        return retcode;
 }