Re: [syzbot] KASAN: use-after-free Read in pty_close

[syzbot]

Hello,

syzbot has tested the proposed patch and the reproducer did not trigger any issue:

Reported-and-tested-by: syzbot+49950ba66096b1f0209b@xxxxxxxxxxxxxxxxxxxxxxxxx

Tested on:

commit:         f2703d1a io_uring: don't race double poll setting REQ_..
git tree:       https://github.com/isilence/linux.git poll-syz
console output: https://syzkaller.appspot.com/x/log.txt?x=115e9020080000
kernel config:  https://syzkaller.appspot.com/x/.config?x=d66f898fdc339ef0
dashboard link: https://syzkaller.appspot.com/bug?extid=49950ba66096b1f0209b
compiler:       gcc (Debian 10.2.1-6) 10.2.1 20210110, GNU ld (GNU Binutils for Debian) 2.35.2

Note: no patches were applied.
Note: testing is done by a robot and is best-effort only.