[PATCH] cfs: NULL pointer check

[Wang Xingchao]

se maybe NULL if cfs_rq->rb_leftmost is NULL

Signed-off-by: Wang Xingchao <xingchao.wang@xxxxxxxxx>
---
 kernel/sched_fair.c |    4 ++++
 1 files changed, 4 insertions(+), 0 deletions(-)

diff --git a/kernel/sched_fair.c b/kernel/sched_fair.c
index fef0bfd..109b232 100644
--- a/kernel/sched_fair.c
+++ b/kernel/sched_fair.c
@@ -1130,6 +1130,10 @@ check_preempt_tick(struct cfs_rq *cfs_rq, struct sched_entity *curr)
 		return;
 
 	se = __pick_first_entity(cfs_rq);
+
+	if (!se)
+		return;
+
 	delta = curr->vruntime - se->vruntime;
 
 	if (delta < 0)
-- 
1.7.1

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