linux-kernel - [PATCH AUTOSEL 4.19 184/237] sched/topology: Fix off by one bug

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Message-Id: <20191116154113.7417-184-sashal@kernel.org>
Date:   Sat, 16 Nov 2019 10:40:19 -0500
From:   Sasha Levin <sashal@...nel.org>
To:     linux-kernel@...r.kernel.org, stable@...r.kernel.org
Cc:     Peter Zijlstra <peterz@...radead.org>,
        Linus Torvalds <torvalds@...ux-foundation.org>,
        Thomas Gleixner <tglx@...utronix.de>,
        Ingo Molnar <mingo@...nel.org>, Sasha Levin <sashal@...nel.org>
Subject: [PATCH AUTOSEL 4.19 184/237] sched/topology: Fix off by one bug

From: Peter Zijlstra <peterz@...radead.org>

[ Upstream commit 993f0b0510dad98b4e6e39506834dab0d13fd539 ]

With the addition of the NUMA identity level, we increased @level by
one and will run off the end of the array in the distance sort loop.

Fixed: 051f3ca02e46 ("sched/topology: Introduce NUMA identity node sched domain")
Signed-off-by: Peter Zijlstra (Intel) <peterz@...radead.org>
Cc: Linus Torvalds <torvalds@...ux-foundation.org>
Cc: Peter Zijlstra <peterz@...radead.org>
Cc: Thomas Gleixner <tglx@...utronix.de>
Cc: linux-kernel@...r.kernel.org
Signed-off-by: Ingo Molnar <mingo@...nel.org>
Signed-off-by: Sasha Levin <sashal@...nel.org>
---
 kernel/sched/topology.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/kernel/sched/topology.c b/kernel/sched/topology.c
index c0a7514649715..74b694392f2fd 100644
--- a/kernel/sched/topology.c
+++ b/kernel/sched/topology.c
@@ -1329,7 +1329,7 @@ void sched_init_numa(void)
 	int level = 0;
 	int i, j, k;
 
-	sched_domains_numa_distance = kzalloc(sizeof(int) * nr_node_ids, GFP_KERNEL);
+	sched_domains_numa_distance = kzalloc(sizeof(int) * (nr_node_ids + 1), GFP_KERNEL);
 	if (!sched_domains_numa_distance)
 		return;
 
-- 
2.20.1