linux-kernel - [72/94] sched/debug: Fix sd->*_idx limit range avoiding overflow

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Date:	Tue, 28 May 2013 04:49:53 +0100
From:	Ben Hutchings <ben@...adent.org.uk>
To:	linux-kernel@...r.kernel.org, stable@...r.kernel.org
CC:	akpm@...ux-foundation.org, "Ingo Molnar" <mingo@...nel.org>,
	"libin" <huawei.libin@...wei.com>,
	"Peter Zijlstra" <peterz@...radead.org>, "" <guohanjun@...wei.com>,
	"" <jiang.liu@...wei.com>
Subject: [72/94] sched/debug: Fix sd->*_idx limit range avoiding overflow

3.2.46-rc1 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>
[bwh: Backported to 3.2: adjust filename]
Signed-off-by: Ben Hutchings <ben@...adent.org.uk>
---
 kernel/sched.c |    2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

--- a/kernel/sched.c
+++ b/kernel/sched.c
@@ -6673,7 +6673,7 @@ 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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