This is a note to let you know that I've just added the patch titled
[media] usbvision: revert commit 588afcc1
to the 4.5-stable tree which can be found at:
http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary
The filename of the patch is:
usbvision-revert-commit-588afcc1.patch
and it can be found in the queue-4.5 subdirectory.
If you, or anyone else, feels it should not be added to the stable tree,
please let <stable@xxxxxxxxxxxxxxx> know about it.
>From d5468d7afaa9c9e961e150f0455a14a9f4872a98 Mon Sep 17 00:00:00 2001
From: Vladis Dronov <vdronov@xxxxxxxxxx>
Date: Sun, 31 Jan 2016 14:14:52 -0200
Subject: [media] usbvision: revert commit 588afcc1
From: Vladis Dronov <vdronov@xxxxxxxxxx>
commit d5468d7afaa9c9e961e150f0455a14a9f4872a98 upstream.
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
GPF.
* "(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
configuration")
* Mailing list message:
http://www.spinics.net/lists/linux-media/msg94832.html
Signed-off-by: Vladis Dronov <vdronov@xxxxxxxxxx>
Signed-off-by: Hans Verkuil <hans.verkuil@xxxxxxxxx>
Signed-off-by: Mauro Carvalho Chehab <mchehab@xxxxxxxxxxxxxxx>
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>
---
drivers/media/usb/usbvision/usbvision-video.c | 7 -------
1 file changed, 7 deletions(-)
--- 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_in
printk(KERN_INFO "%s: %s found\n", __func__,
usbvision_device_data[model].model_string);
- /*
- * 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)
Patches currently in stable-queue which might be from vdronov@xxxxxxxxxx are
queue-4.5/usbvision-revert-commit-588afcc1.patch
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