linux-kernel - [PATCH v2] sched: add missing rcu_deref around real

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Message-ID: <20111215164918.GA13003@www.outflux.net>
Date:	Thu, 15 Dec 2011 08:49:18 -0800
From:	Kees Cook <keescook@...omium.org>
To:	linux-kernel@...r.kernel.org
Cc:	Ingo Molnar <mingo@...e.hu>,
	Peter Zijlstra <a.p.zijlstra@...llo.nl>,
	Glauber Costa <glommer@...allels.com>,
	Suresh Siddha <suresh.b.siddha@...el.com>,
	KAMEZAWA Hiroyuki <kamezawa.hiroyu@...fujitsu.com>
Subject: [PATCH v2] sched: add missing rcu_deref around real_parent

Wrap another real_parent dereference while under rcu_read_lock.

Signed-off-by: Kees Cook <keescook@...omium.org>
---
v2: rebase to korg/tip/tip.git
---
 kernel/sched/core.c |    2 +-
 1 files changed, 1 insertions(+), 1 deletions(-)

diff --git a/kernel/sched/core.c b/kernel/sched/core.c
index 3c5b21e..c7ea688 100644
--- a/kernel/sched/core.c
+++ b/kernel/sched/core.c
@@ -4784,7 +4784,7 @@ void sched_show_task(struct task_struct *p)
 	free = stack_not_used(p);
 #endif
 	printk(KERN_CONT "%5lu %5d %6d 0x%08lx\n", free,
-		task_pid_nr(p), task_pid_nr(p->real_parent),
+		task_pid_nr(p), task_pid_nr(rcu_dereference(p->real_parent)),
 		(unsigned long)task_thread_info(p)->flags);
 
 	show_stack(p, NULL);
-- 
1.7.0.4

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