From: Tejun Heo <tj@kernel.org>
Date: Mon, 21 Nov 2011 20:32:26 +0000 (-0800)
Subject: freezer: use lock_task_sighand() in fake_signal_wake_up()
X-Git-Tag: v3.3-rc1~148^2~24^2~5
X-Git-Url: http://git.openpandora.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=37ad8aca94a1da2112a7c56151390914e80d1113;p=pandora-kernel.git

freezer: use lock_task_sighand() in fake_signal_wake_up()

cgroup_freezer calls freeze_task() without holding tasklist_lock and,
if the task is exiting, its ->sighand may be gone by the time
fake_signal_wake_up() is called.  Use lock_task_sighand() instead of
accessing ->sighand directly.

Signed-off-by: Tejun Heo <tj@kernel.org>
Reported-by: Oleg Nesterov <oleg@redhat.com>
Acked-by: Oleg Nesterov <oleg@redhat.com>
Cc: "Rafael J. Wysocki" <rjw@sisk.pl>
Cc: Paul Menage <paul@paulmenage.org>
---

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