From 6719693ca2efb0f04654d05768ee299e87e1694b Mon Sep 17 00:00:00 2001
From: Patrick Donnelly <batrick@batbytes.com>
Date: Sun, 12 Jul 2015 18:51:52 -0400
Subject: [PATCH] tty: add missing rcu_read_lock for task_pgrp

task_pgrp requires an rcu or tasklist lock to be obtained if the returned pid
is to be dereferenced, which kill_pgrp does. Obtain an RCU lock for the
duration of use.

Signed-off-by: Patrick Donnelly <batrick@batbytes.com>
Reviewed-by: Peter Hurley <peter@hurleysoftware.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
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Reading git-format-patch failed