linux-kernel - [PATCH 3.4 082/214] sched/debug: Fix sd->*

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Message-Id: <20140605041650.602976532@linuxfoundation.org>
Date:	Wed,  4 Jun 2014 21:17:25 -0700
From:	Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:	linux-kernel@...r.kernel.org
Cc:	Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
	stable@...r.kernel.org, Libin <huawei.libin@...wei.com>,
	jiang.liu@...wei.com, guohanjun@...wei.com,
	Peter Zijlstra <peterz@...radead.org>,
	Ingo Molnar <mingo@...nel.org>,
	Rui Xiang <rui.xiang@...wei.com>
Subject: [PATCH 3.4 082/214] sched/debug: Fix sd->*_idx limit range avoiding overflow

3.4-stable review patch.  If anyone has any objections, please let me know.

------------------

From: libin <huawei.libin@...wei.com>

commit fd9b86d37a600488dbd80fe60cca46b822bff1cd upstream.

Commit 201c373e8e ("sched/debug: Limit sd->*_idx range on
sysctl") was an incomplete bug fix.

This patch fixes sd->*_idx limit range to [0 ~ CPU_LOAD_IDX_MAX-1]
avoiding array overflow caused by setting sd->*_idx to CPU_LOAD_IDX_MAX
on sysctl.

Signed-off-by: Libin <huawei.libin@...wei.com>
Cc: <jiang.liu@...wei.com>
Cc: <guohanjun@...wei.com>
Cc: Peter Zijlstra <peterz@...radead.org>
Link: http://lkml.kernel.org/r/51626610.2040607@huawei.com
Signed-off-by: Ingo Molnar <mingo@...nel.org>
Cc: Rui Xiang <rui.xiang@...wei.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@...uxfoundation.org>

---
 kernel/sched/core.c |    2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

--- a/kernel/sched/core.c
+++ b/kernel/sched/core.c
@@ -5434,7 +5434,7 @@ static void sd_free_ctl_entry(struct ctl
 }
 
 static int min_load_idx = 0;
-static int max_load_idx = CPU_LOAD_IDX_MAX;
+static int max_load_idx = CPU_LOAD_IDX_MAX-1;
 
 static void
 set_table_entry(struct ctl_table *entry,


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