linux-kernel - [tip:perf/core] perf: Fix free

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Message-ID: <tip-0c67b40872326a5340cab51d79a192a5fbaeb484@git.kernel.org>
Date:	Mon, 13 Sep 2010 15:19:08 GMT
From:	tip-bot for Peter Zijlstra <a.p.zijlstra@...llo.nl>
To:	linux-tip-commits@...r.kernel.org
Cc:	linux-kernel@...r.kernel.org, hpa@...or.com, mingo@...hat.com,
	a.p.zijlstra@...llo.nl, tglx@...utronix.de, gorcunov@...il.com,
	mingo@...e.hu
Subject: [tip:perf/core] perf: Fix free_event()

Commit-ID:  0c67b40872326a5340cab51d79a192a5fbaeb484
Gitweb:     http://git.kernel.org/tip/0c67b40872326a5340cab51d79a192a5fbaeb484
Author:     Peter Zijlstra <a.p.zijlstra@...llo.nl>
AuthorDate: Mon, 13 Sep 2010 11:15:58 +0200
Committer:  Ingo Molnar <mingo@...e.hu>
CommitDate: Mon, 13 Sep 2010 17:08:42 +0200

perf: Fix free_event()

With the context rework stuff we can actually end up freeing an event
before it gets attached to a context.

Reported-by: Cyrill Gorcunov <gorcunov@...il.com>
Signed-off-by: Peter Zijlstra <a.p.zijlstra@...llo.nl>
LKML-Reference: <new-submission>
Signed-off-by: Ingo Molnar <mingo@...e.hu>
---
 kernel/perf_event.c |    4 +++-
 1 files changed, 3 insertions(+), 1 deletions(-)

diff --git a/kernel/perf_event.c b/kernel/perf_event.c
index bc46bff..440f9ca 100644
--- a/kernel/perf_event.c
+++ b/kernel/perf_event.c
@@ -2150,7 +2150,9 @@ static void free_event(struct perf_event *event)
 	if (event->destroy)
 		event->destroy(event);
 
-	put_ctx(event->ctx);
+	if (event->ctx)
+		put_ctx(event->ctx);
+
 	call_rcu(&event->rcu_head, free_event_rcu);
 }
 
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