| From | Willy Tarreau <> | Subject | [PATCH 3.10 226/250] USB: usbtmc: add missing endpoint sanity check | Date | Thu, 8 Jun 2017 01:00:12 +0200 |
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From: Johan Hovold <johan@kernel.org>
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> --- drivers/usb/class/usbtmc.c | 9 ++++++++- 1 file changed, 8 insertions(+), 1 deletion(-)
diff --git a/drivers/usb/class/usbtmc.c b/drivers/usb/class/usbtmc.c index 4c5506a..6431789 100644 --- 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; } -- 2.8.0.rc2.1.gbe9624a
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