Hi Németh,
On Mon, Oct 11, 2010 at 08:54:04PM +0200, Németh Márton wrote:
> There might be similar problem also in the case USB_DEVICE_ID_CODEMERCS_IOW56. There
> is buf is allocated with usb_alloc_coherent() to the size dev->report_size. However,
> some lines later the copy_from_user() function tries to copy "count" number of
> bytes to the dev->report_size allocated buffer. Unfortunately I don't have such
> devices to try the driver so these are just coming from "static analysis".
I don't think the USB_DEVICE_ID_CODEMERCS_IOW56 path is a problem:
if (count != dev->report_size) {
retval = -EINVAL;
goto exit;
}
switch (dev->product_id) {
...
case USB_DEVICE_ID_CODEMERCS_IOW56:
...
buf = usb_alloc_coherent(dev->udev, dev->report_size,
GFP_KERNEL, &int_out_urb->transfer_dma);
...
if (copy_from_user(buf, user_buffer, count)) {
i.e. count must == dev->report_size, and the buf is allocated with size
dev->report_size even though copy_from_user uses "count".
-Kees
--
Kees Cook
Ubuntu Security Team
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