Re: KASAN: use-after-free Read in userfaultfd_release (2)

[syzbot]

syzbot has bisected this bug to:

commit d08ac70b1e0dc71ac2315007bcc3efb283b2eae4
Author: Daniel Colascione <dancol@xxxxxxxxxx>
Date:   Wed Apr 1 21:39:03 2020 +0000

    Wire UFFD up to SELinux

bisection log:  https://syzkaller.appspot.com/x/bisect.txt?x=14a79d13100000
start commit:   89032636 Add linux-next specific files for 20200708
git tree:       linux-next
final crash:    https://syzkaller.appspot.com/x/report.txt?x=16a79d13100000
console output: https://syzkaller.appspot.com/x/log.txt?x=12a79d13100000
kernel config:  https://syzkaller.appspot.com/x/.config?x=64a250ebabc6c320
dashboard link: https://syzkaller.appspot.com/bug?extid=75867c44841cb6373570
syz repro:      https://syzkaller.appspot.com/x/repro.syz?x=13c4c8db100000
C reproducer:   https://syzkaller.appspot.com/x/repro.c?x=12cbb68f100000

Reported-by: syzbot+75867c44841cb6373570@xxxxxxxxxxxxxxxxxxxxxxxxx
Fixes: d08ac70b1e0d ("Wire UFFD up to SELinux")

For information about bisection process see: https://goo.gl/tpsmEJ#bisection