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From:   Sasha Levin <Alexander.Levin@microsoft.com>
To:     "stable@vger.kernel.org" <stable@vger.kernel.org>,
        "linux-kernel@vger.kernel.org" <linux-kernel@vger.kernel.org>
CC:     Daniel Axtens <dja@axtens.net>, Ben Segall <bsegall@google.com>,
        Konstantin Khlebnikov <khlebnikov@yandex-team.ru>,
        Linus Torvalds <torvalds@linux-foundation.org>,
        Mike Galbraith <efault@gmx.de>,
        Peter Zijlstra <peterz@infradead.org>,
        Thomas Gleixner <tglx@linutronix.de>,
        Ingo Molnar <mingo@kernel.org>,
        Sasha Levin <Alexander.Levin@microsoft.com>
Subject: [PATCH AUTOSEL for 4.9 102/293] sched/fair: WARN() and refuse to set
 buddy when !se->on_rq
Thread-Topic: [PATCH AUTOSEL for 4.9 102/293] sched/fair: WARN() and refuse to
 set buddy when !se->on_rq
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Date:   Mon, 9 Apr 2018 00:24:13 +0000
Message-ID: <20180409002239.163177-102-alexander.levin@microsoft.com>
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From: Daniel Axtens <dja@axtens.net>

[ Upstream commit c5ae366e12b2bd56fc7d7e9d484836bec9ddc110 ]

If we set a next or last buddy for a se that is not on_rq, we will
end up taking a NULL pointer dereference in wakeup_preempt_entity
via pick_next_task_fair.

Detect when we would be about to do that, throw a warning and
then refuse to actually set it.

This has been suggested at least twice:

  https://marc.info/?l=3Dlinux-kernel&m=3D146651668921468&w=3D2
  https://lkml.org/lkml/2016/6/16/663

I recently had to debug a problem with these (we hadn't backported
Konstantin's patches in this area) and this would have saved a lot
of time/pain.

Just do it.

Signed-off-by: Daniel Axtens <dja@axtens.net>
Cc: Ben Segall <bsegall@google.com>
Cc: Konstantin Khlebnikov <khlebnikov@yandex-team.ru>
Cc: Linus Torvalds <torvalds@linux-foundation.org>
Cc: Mike Galbraith <efault@gmx.de>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Thomas Gleixner <tglx@linutronix.de>
Link: http://lkml.kernel.org/r/20170510201139.16236-1-dja@axtens.net
Signed-off-by: Ingo Molnar <mingo@kernel.org>
Signed-off-by: Sasha Levin <alexander.levin@microsoft.com>
---
 kernel/sched/fair.c | 10 ++++++++--
 1 file changed, 8 insertions(+), 2 deletions(-)

diff --git a/kernel/sched/fair.c b/kernel/sched/fair.c
index 3d862f5b0331..44f2dd56a88f 100644
--- a/kernel/sched/fair.c
+++ b/kernel/sched/fair.c
@@ -5774,8 +5774,11 @@ static void set_last_buddy(struct sched_entity *se)
 	if (entity_is_task(se) && unlikely(task_of(se)->policy =3D=3D SCHED_IDLE)=
)
 		return;
=20
-	for_each_sched_entity(se)
+	for_each_sched_entity(se) {
+		if (SCHED_WARN_ON(!se->on_rq))
+			return;
 		cfs_rq_of(se)->last =3D se;
+	}
 }
=20
 static void set_next_buddy(struct sched_entity *se)
@@ -5783,8 +5786,11 @@ static void set_next_buddy(struct sched_entity *se)
 	if (entity_is_task(se) && unlikely(task_of(se)->policy =3D=3D SCHED_IDLE)=
)
 		return;
=20
-	for_each_sched_entity(se)
+	for_each_sched_entity(se) {
+		if (SCHED_WARN_ON(!se->on_rq))
+			return;
 		cfs_rq_of(se)->next =3D se;
+	}
 }
=20
 static void set_skip_buddy(struct sched_entity *se)
--=20
2.15.1