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| /openbmc/linux/drivers/hid/usbhid/ |
| H A D | hid-core.c | diff 0a824efdb724e07574bafcd2c2486b2a3de35ff6 Wed Sep 01 11:36:00 CDT 2021 Alan Stern <stern@rowland.harvard.edu> 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 <stern@rowland.harvard.edu>
Reported-and-tested-by: syzbot+9b57a46bf1801ce2a2ca@syzkaller.appspotmail.com
Tested-by: Oleksandr Natalenko <oleksandr@natalenko.name>
Tested-by: Benjamin Tissoires <benjamin.tissoires@redhat.com>
Acked-by: Benjamin Tissoires <benjamin.tissoires@redhat.com>
Cc: stable@vger.kernel.org
Signed-off-by: Jiri Kosina <jkosina@suse.cz>
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