linux-kernel - [tip:perf/core] perf: Fix off by one test in perf_reg

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Date:	Wed, 19 Sep 2012 10:04:07 -0700
From:	tip-bot for Dan Carpenter <dan.carpenter@...cle.com>
To:	linux-tip-commits@...r.kernel.org
Cc:	linux-kernel@...r.kernel.org, acme@...hat.com, hpa@...or.com,
	mingo@...nel.org, a.p.zijlstra@...llo.nl, jolsa@...hat.com,
	fweisbec@...il.com, tglx@...utronix.de, dan.carpenter@...cle.com
Subject: [tip:perf/core] perf: Fix off by one test in perf_reg_value()

Commit-ID:  1e6dd8adc78d4a153db253d051fd4ef6c49c9019
Gitweb:     http://git.kernel.org/tip/1e6dd8adc78d4a153db253d051fd4ef6c49c9019
Author:     Dan Carpenter <dan.carpenter@...cle.com>
AuthorDate: Wed, 5 Sep 2012 15:31:26 +0300
Committer:  Ingo Molnar <mingo@...nel.org>
CommitDate: Wed, 19 Sep 2012 17:08:40 +0200

perf: Fix off by one test in perf_reg_value()

The test should be >= ARRAY_SIZE() instead of > ARRAY_SIZE().

Signed-off-by: Dan Carpenter <dan.carpenter@...cle.com>
Acked-by: Jiri Olsa <jolsa@...hat.com>
Acked-by: Peter Zijlstra <a.p.zijlstra@...llo.nl>
Cc: Frederic Weisbecker <fweisbec@...il.com>
Cc: Arnaldo Carvalho de Melo <acme@...hat.com>
Link: http://lkml.kernel.org/r/20120905123126.GC6128@elgon.mountain
Signed-off-by: Ingo Molnar <mingo@...nel.org>
---
 arch/x86/kernel/perf_regs.c |    2 +-
 1 files changed, 1 insertions(+), 1 deletions(-)

diff --git a/arch/x86/kernel/perf_regs.c b/arch/x86/kernel/perf_regs.c
index c5a3e5c..e309cc5 100644
--- a/arch/x86/kernel/perf_regs.c
+++ b/arch/x86/kernel/perf_regs.c
@@ -57,7 +57,7 @@ static unsigned int pt_regs_offset[PERF_REG_X86_MAX] = {
 
 u64 perf_reg_value(struct pt_regs *regs, int idx)
 {
-	if (WARN_ON_ONCE(idx > ARRAY_SIZE(pt_regs_offset)))
+	if (WARN_ON_ONCE(idx >= ARRAY_SIZE(pt_regs_offset)))
 		return 0;
 
 	return regs_get_register(regs, pt_regs_offset[idx]);
--
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