HID: betop: fix slab-out-of-bounds Write in betop_probe

stable inclusion
from stable-v4.19.209
commit bb8b72374db69afa25a5b65cf1c092860c6fe914
category: bugfix
bugzilla: https://gitee.com/src-openeuler/kernel/issues/I9R4OM
CVE: CVE-2021-47404

Reference: https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git/commit/?id=bb8b72374db69afa25a5b65cf1c092860c6fe914



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commit 1e4ce418 upstream.

Syzbot reported slab-out-of-bounds Write bug in hid-betopff driver.
The problem is the driver assumes the device must have an input report but
some malicious devices violate this assumption.

So this patch checks hid_device's input is non empty before it's been used.

Reported-by:  <syzbot+07efed3bc5a1407bd742@syzkaller.appspotmail.com>
Signed-off-by: F.A. SULAIMAN <asha.16@itfac.mrt.ac.lk>
Reviewed-by: Pavel Skripkin <paskripkin@gmail.com>
Signed-off-by: Jiri Kosina <jkosina@suse.cz>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Signed-off-by: Li Huafei <lihuafei1@huawei.com>