UBSan: Undefined Behavior in compat_43_ttioctl.cold.0

To: syzbot+f9c4dc89a32146665fe3%syzkaller.appspotmail.com@localhost
Subject: UBSan: Undefined Behavior in compat_43_ttioctl.cold.0
From: Taylor R Campbell <riastradh%NetBSD.org@localhost>
Date: Sun, 10 Jul 2022 09:37:05 +0000

#syz fix: tty_43: Check a bitset from userspace is valid before shifting it

https://syzkaller.appspot.com/bug?id=2e63ffadcef15f5641353a1ddea69331cfd2db3a
https://mail-index.netbsd.org/source-changes/2020/10/09/msg122759.html

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