[PATCH AUTOSEL 4.4 22/65] [media] usbvision: revert commit 588afcc1

From: Sasha Levin
Date: Thu Oct 25 2018 - 10:17:50 EST

From: Vladis Dronov <vdronov@xxxxxxxxxx>

[ Upstream commit d5468d7afaa9c9e961e150f0455a14a9f4872a98 ]

Commit 588afcc1c0e4 ("[media] usbvision fix overflow of interfaces
array")' should be reverted, because:

* "!dev->actconfig->interface[ifnum]" won't catch a case where the value
is not NULL but some garbage. This way the system may crash later with

* "(ifnum >= USB_MAXINTERFACES)" does not cover all the error
conditions. "ifnum" should be compared to "dev->actconfig->
desc.bNumInterfaces", i.e. compared to the number of "struct
usb_interface" kzalloc()-ed, not to USB_MAXINTERFACES.

* There is a "struct usb_device" leak in this error path, as there is
usb_get_dev(), but no usb_put_dev() on this path.

* There is a bug of the same type several lines below with number of
endpoints. The code is accessing hard-coded second endpoint
("interface->endpoint[1].desc") which may not exist. It would be great
to handle this in the same patch too.

* All the concerns above are resolved by already-accepted commit fa52bd50
("[media] usbvision: fix crash on detecting device with invalid

* Mailing list message:

Signed-off-by: Vladis Dronov <vdronov@xxxxxxxxxx>
Signed-off-by: Hans Verkuil <hans.verkuil@xxxxxxxxx>
Cc: <stable@xxxxxxxxxxxxxxx> # for v4.5
Signed-off-by: Mauro Carvalho Chehab <mchehab@xxxxxxxxxxxxxxx>
Signed-off-by: Sasha Levin <sashal@xxxxxxxxxx>
drivers/media/usb/usbvision/usbvision-video.c | 7 -------
1 file changed, 7 deletions(-)

diff --git a/drivers/media/usb/usbvision/usbvision-video.c b/drivers/media/usb/usbvision/usbvision-video.c
index cafc34938a79..91d709efef7a 100644
--- a/drivers/media/usb/usbvision/usbvision-video.c
+++ b/drivers/media/usb/usbvision/usbvision-video.c
@@ -1461,13 +1461,6 @@ static int usbvision_probe(struct usb_interface *intf,
printk(KERN_INFO "%s: %s found\n", __func__,

- /*
- * this is a security check.
- * an exploit using an incorrect bInterfaceNumber is known
- */
- if (ifnum >= USB_MAXINTERFACES || !dev->actconfig->interface[ifnum])
- return -ENODEV;
if (usbvision_device_data[model].interface >= 0)
interface = &dev->actconfig->interface[usbvision_device_data[model].interface]->altsetting[0];
else if (ifnum < dev->actconfig->desc.bNumInterfaces)