HID: usbhid: fix info leak in hid_submit_ctrl

stable inclusion
from stable-v4.19.196
commit 0e280502be1b003c3483ae03fc60dea554fcfa82
category: bugfix
bugzilla: https://gitee.com/src-openeuler/kernel/issues/I93XA7
CVE: CVE-2021-46906

Reference: https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git/commit/?id=0e280502be1b003c3483ae03fc60dea554fcfa82



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[ Upstream commit 6be388f4 ]

In hid_submit_ctrl(), the way of calculating the report length doesn't
take into account that report->size can be zero. When running the
syzkaller reproducer, a report of size 0 causes hid_submit_ctrl) to
calculate transfer_buffer_length as 16384. When this urb is passed to
the usb core layer, KMSAN reports an info leak of 16384 bytes.

To fix this, first modify hid_report_len() to account for the zero
report size case by using DIV_ROUND_UP for the division. Then, call it
from hid_submit_ctrl().

Reported-by:  <syzbot+7c2bb71996f95a82524c@syzkaller.appspotmail.com>
Signed-off-by: Anirudh Rayabharam <mail@anirudhrb.com>
Acked-by: Benjamin Tissoires <benjamin.tissoires@redhat.com>
Signed-off-by: Jiri Kosina <jkosina@suse.cz>
Signed-off-by: Sasha Levin <sashal@kernel.org>
Signed-off-by: Yu Liao <liaoyu15@huawei.com>