linux-kernel - [patch 110/164] perf_events: Fix resource leak in x86 __hw_perf_event

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Message-Id: <20100701173436.072188984@clark.site>
Date:	Thu, 01 Jul 2010 10:34:56 -0700
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,
	Stephane Eranian <eranian@...gle.com>, peterz@...radead.org,
	paulus@...ba.org, davem@...emloft.net, fweisbec@...il.com,
	robert.richter@....com, perfmon2-devel@...ts.sf.net,
	Ingo Molnar <mingo@...e.hu>
Subject: [patch 110/164] perf_events: Fix resource leak in x86 __hw_perf_event_init()

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

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

From: Stephane Eranian <eranian@...gle.com>

commit 4b24a88b35e15e04bd8f2c5dda65b5dc8ebca05f upstream.

If reserve_pmc_hardware() succeeds but reserve_ds_buffers()
fails, then we need to release_pmc_hardware. It won't be done
by the destroy() callback because we return before setting it
in case of error.

Signed-off-by: Stephane Eranian <eranian@...gle.com>
Cc: peterz@...radead.org
Cc: paulus@...ba.org
Cc: davem@...emloft.net
Cc: fweisbec@...il.com
Cc: robert.richter@....com
Cc: perfmon2-devel@...ts.sf.net
LKML-Reference: <4ba1568b.15185e0a.182a.7802@...google.com>
Signed-off-by: Ingo Molnar <mingo@...e.hu>
Signed-off-by: Greg Kroah-Hartman <gregkh@...e.de>

---
 arch/x86/kernel/cpu/perf_event.c |    5 ++++-
 1 file changed, 4 insertions(+), 1 deletion(-)

--- a/arch/x86/kernel/cpu/perf_event.c
+++ b/arch/x86/kernel/cpu/perf_event.c
@@ -1060,8 +1060,11 @@ static int __hw_perf_event_init(struct p
 		if (atomic_read(&active_events) == 0) {
 			if (!reserve_pmc_hardware())
 				err = -EBUSY;
-			else
+			else {
 				err = reserve_bts_hardware();
+				if (err)
+					release_pmc_hardware();
+			}
 		}
 		if (!err)
 			atomic_inc(&active_events);


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