HID: usbhid: Fix warning caused by 0-length input reports

Syzbot found a warning caused by hid_submit_ctrl() submitting a
control request to transfer a 0-length input report:

	usb 1-1: BOGUS control dir, pipe 80000280 doesn't match bRequestType a1

(The warning message is a little difficult to understand.  It means
that the control request claims to be for an IN transfer but this
contradicts the USB spec, which requires 0-length control transfers
always to be in the OUT direction.)

Now, a zero-length report isn't good for anything and there's no
reason for a device to have one, but the fuzzer likes to pick out
these weird edge cases.  In the future, perhaps we will decide to
reject 0-length reports at probe time.  For now, the simplest approach
for avoiding these warnings is to pretend that the report actually has
length 1.

Signed-off-by: Alan Stern <[email protected]>
Reported-and-tested-by: [email protected]
Tested-by: Oleksandr Natalenko <[email protected]>
Tested-by: Benjamin Tissoires <[email protected]>
Acked-by: Benjamin Tissoires <[email protected]>
Cc: [email protected]
Signed-off-by: Jiri Kosina <[email protected]>

0 files changed, 0 insertions, 0 deletions