linux-kernel - [51/74] oprofile/x86: fix crash when profiling more than 28 events

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Message-Id: <20100204171517.050168765@linux.site>
Date:	Thu, 04 Feb 2010 09:12:22 -0800
From:	Greg KH <gregkh@...e.de>
To:	linux-kernel@...r.kernel.org, stable@...nel.org
Cc:	stable-review@...nel.org, torvalds@...ux-foundation.org,
	akpm@...ux-foundation.org, alan@...rguk.ukuu.org.uk,
	Suravee Suthikulpanit <suravee.suthikulpanit@....com>,
	Robert Richter <robert.richter@....com>,
	Greg Kroah-Hartman <gregkh@...e.de>
Subject: [51/74] oprofile/x86: fix crash when profiling more than 28 events

2.6.32-stable review patch.  If anyone has any objections, please let us know.

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

From: Suravee Suthikulpanit <suravee.suthikulpanit@....com>

commit d8cc108f4fab42b380c6b3f3356f99e8dd5372e2 upstream.

With multiplexing enabled oprofile crashs when profiling more than 28
events. This patch fixes this.

Signed-off-by: Suravee Suthikulpanit <suravee.suthikulpanit@....com>
Signed-off-by: Robert Richter <robert.richter@....com>
Signed-off-by: Greg Kroah-Hartman <gregkh@...e.de>

---
 arch/x86/oprofile/nmi_int.c |    2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

--- a/arch/x86/oprofile/nmi_int.c
+++ b/arch/x86/oprofile/nmi_int.c
@@ -222,7 +222,7 @@ static void nmi_cpu_switch(void *dummy)
 
 	/* move to next set */
 	si += model->num_counters;
-	if ((si > model->num_virt_counters) || (counter_config[si].count == 0))
+	if ((si >= model->num_virt_counters) || (counter_config[si].count == 0))
 		per_cpu(switch_index, cpu) = 0;
 	else
 		per_cpu(switch_index, cpu) = si;


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