tree 39345b039cfa297ddddfea384c78ff001909639f
parent 3dfde6d357b44e8b8185e797a1ef9cd371f6c735
author Martijn Coenen <maco@android.com> 1518770835 +0100
committer Todd Kjos <tkjos@google.com> 1571089147 -0700

UPSTREAM: ANDROID: binder: synchronize_rcu() when using POLLFREE.

To prevent races with ep_remove_waitqueue() removing the
waitqueue at the same time.

Reported-by: syzbot+a2a3c4909716e271487e@syzkaller.appspotmail.com
Signed-off-by: Martijn Coenen <maco@android.com>
Cc: stable <stable@vger.kernel.org> # 4.14+
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
(cherry picked from commit 5eeb2ca02a2f6084fc57ae5c244a38baab07033a)

Change-Id: Ia0089448079c78d0ab0b57303faf838e9e5ee797