From: Dan Carpenter <dan.carpenter@oracle.com>
Date: Wed, 5 Sep 2012 12:31:26 +0000 (+0300)
Subject: perf: Fix off by one test in perf_reg_value()
X-Git-Url: http://git.lede-project.org./?a=commitdiff_plain;h=1e6dd8adc78d4a153db253d051fd4ef6c49c9019;p=openwrt%2Fstaging%2Fblogic.git

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@oracle.com>
Acked-by: Jiri Olsa <jolsa@redhat.com>
Acked-by: Peter Zijlstra <a.p.zijlstra@chello.nl>
Cc: Frederic Weisbecker <fweisbec@gmail.com>
Cc: Arnaldo Carvalho de Melo <acme@redhat.com>
Link: http://lkml.kernel.org/r/20120905123126.GC6128@elgon.mountain
Signed-off-by: Ingo Molnar <mingo@kernel.org>
---

diff --git a/arch/x86/kernel/perf_regs.c b/arch/x86/kernel/perf_regs.c
index c5a3e5cfe07f..e309cc5c276e 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]);