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char: xillybus: Check USB endpoints when probing device

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Ensure, as the driver probes the device, that all endpoints that the
driver may attempt to access exist and are of the correct type.

All XillyUSB devices must have a Bulk IN and Bulk OUT endpoint at
address 1. This is verified in xillyusb_setup_base_eps().

On top of that, a XillyUSB device may have additional Bulk OUT
endpoints. The information about these endpoints' addresses is deduced
from a data structure (the IDT) that the driver fetches from the device
while probing it. These endpoints are checked in setup_channels().

A XillyUSB device never has more than one IN endpoint, as all data
towards the host is multiplexed in this single Bulk IN endpoint. This is
why setup_channels() only checks OUT endpoints.

Reported-by: syzbot+eac39cba052f2e750dbe@syzkaller.appspotmail.com
Cc: stable <stable@kernel.org>
Closes: https://lore.kernel.org/all/0000000000001d44a6061f7a54ee@google.com/T/
Fixes: a53d1202ae ("char: xillybus: Add driver for XillyUSB (Xillybus variant for USB)").
Signed-off-by: Eli Billauer <eli.billauer@gmail.com>
Link: https://lore.kernel.org/r/20240816070200.50695-2-eli.billauer@gmail.com
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Eli Billauer 2024-08-16 10:02:00 +03:00 committed by Greg Kroah-Hartman
parent ad899c301c
commit 2374bf7558
1 changed files with 20 additions and 2 deletions
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22
drivers/char/xillybus/xillyusb.c
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@ -1903,6 +1903,13 @@ static const struct file_operations xillyusb_fops = {
static int xillyusb_setup_base_eps(struct xillyusb_dev *xdev)
{
struct usb_device *udev = xdev->udev;
/* Verify that device has the two fundamental bulk in/out endpoints */
if (usb_pipe_type_check(udev, usb_sndbulkpipe(udev, MSG_EP_NUM)) ||
usb_pipe_type_check(udev, usb_rcvbulkpipe(udev, IN_EP_NUM)))
return -ENODEV;
xdev->msg_ep = endpoint_alloc(xdev, MSG_EP_NUM | USB_DIR_OUT,
bulk_out_work, 1, 2);
if (!xdev->msg_ep)
@ -1932,14 +1939,15 @@ static int setup_channels(struct xillyusb_dev *xdev,
__le16 *chandesc,
int num_channels)
{
struct xillyusb_channel *chan;
struct usb_device *udev = xdev->udev;
struct xillyusb_channel *chan, *new_channels;
int i;
chan = kcalloc(num_channels, sizeof(*chan), GFP_KERNEL);
if (!chan)
return -ENOMEM;
xdev->channels = chan;
new_channels = chan;
for (i = 0; i < num_channels; i++, chan++) {
unsigned int in_desc = le16_to_cpu(*chandesc++);
@ -1968,6 +1976,15 @@ static int setup_channels(struct xillyusb_dev *xdev,
*/
if ((out_desc & 0x80) && i < 14) { /* Entry is valid */
if (usb_pipe_type_check(udev,
usb_sndbulkpipe(udev, i + 2))) {
dev_err(xdev->dev,
"Missing BULK OUT endpoint %d\n",
i + 2);
kfree(new_channels);
return -ENODEV;
}
chan->writable = 1;
chan->out_synchronous = !!(out_desc & 0x40);
chan->out_seekable = !!(out_desc & 0x20);
@ -1977,6 +1994,7 @@ static int setup_channels(struct xillyusb_dev *xdev,
}
}
xdev->channels = new_channels;
return 0;
}