From: Stephane Eranian <eranian@google.com>
Date: Wed, 17 Mar 2010 21:21:01 +0000 (+0200)
Subject: perf_events: Fix resource leak in x86 __hw_perf_event_init()
X-Git-Tag: v2.6.32.16~51
X-Git-Url: https://git.karo-electronics.de/?a=commitdiff_plain;h=964baffc6f14ece601c417f9a94c8dbcdd5c97a2;p=karo-tx-linux.git

perf_events: Fix resource leak in x86 __hw_perf_event_init()

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@google.com>
Cc: peterz@infradead.org
Cc: paulus@samba.org
Cc: davem@davemloft.net
Cc: fweisbec@gmail.com
Cc: robert.richter@amd.com
Cc: perfmon2-devel@lists.sf.net
LKML-Reference: <4ba1568b.15185e0a.182a.7802@mx.google.com>
Signed-off-by: Ingo Molnar <mingo@elte.hu>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
---

diff --git a/arch/x86/kernel/cpu/perf_event.c b/arch/x86/kernel/cpu/perf_event.c
index efea222b0351..0ff02cae710b 100644
--- a/arch/x86/kernel/cpu/perf_event.c
+++ b/arch/x86/kernel/cpu/perf_event.c
@@ -1005,8 +1005,11 @@ static int __hw_perf_event_init(struct perf_event *event)
 		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);