From: Kees Cook <keescook@chromium.org>
Date: Thu, 15 Dec 2011 16:49:18 +0000 (-0800)
Subject: sched: Add missing rcu_dereference() around ->real_parent usage
X-Git-Tag: v3.3-rc1~191^2~9^2
X-Git-Url: https://asedeno.scripts.mit.edu/gitweb/?a=commitdiff_plain;h=07cde2608a3b5c66515363f1b53623b1536b9785;p=linux.git

sched: Add missing rcu_dereference() around ->real_parent usage

Wrap another ->real_parent dereference while under rcu_read_lock.

Signed-off-by: Kees Cook <keescook@chromium.org>
Cc: Peter Zijlstra <a.p.zijlstra@chello.nl>
Cc: Glauber Costa <glommer@parallels.com>
Cc: Suresh Siddha <suresh.b.siddha@intel.com>
Cc: KAMEZAWA Hiroyuki <kamezawa.hiroyu@jp.fujitsu.com>
Link: http://lkml.kernel.org/r/20111215164918.GA13003@www.outflux.net
[ tidied up the changelog ]
Signed-off-by: Ingo Molnar <mingo@elte.hu>
---

diff --git a/kernel/sched/core.c b/kernel/sched/core.c
index 3c5b21e2ef20..c7ea688faff4 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);