linux-kernel - [RFC PATCH 6/6] perf: Fix double put

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Date:	Thu,  1 Jul 2010 17:36:02 +0200
From:	Frederic Weisbecker <fweisbec@...il.com>
To:	LKML <linux-kernel@...r.kernel.org>
Cc:	LKML <linux-kernel@...r.kernel.org>,
	Frederic Weisbecker <fweisbec@...il.com>,
	Ingo Molnar <mingo@...e.hu>,
	Peter Zijlstra <a.p.zijlstra@...llo.nl>,
	Arnaldo Carvalho de Melo <acme@...hat.com>,
	Paul Mackerras <paulus@...ba.org>,
	Stephane Eranian <eranian@...gle.com>,
	Will Deacon <will.deacon@....com>,
	David Miller <davem@...emloft.net>,
	Paul Mundt <lethal@...ux-sh.org>,
	Borislav Petkov <bp@...64.org>
Subject: [RFC PATCH 6/6] perf: Fix double put_ctx

If we call free_event on fail case of event creation, it
already put the context. The falldown goto, though, also
does a put_ctx, which might dereference a freed context.

Signed-off-by: Frederic Weisbecker <fweisbec@...il.com>
Cc: Ingo Molnar <mingo@...e.hu>
Cc: Peter Zijlstra <a.p.zijlstra@...llo.nl>
Cc: Arnaldo Carvalho de Melo <acme@...hat.com>
Cc: Paul Mackerras <paulus@...ba.org>
Cc: Stephane Eranian <eranian@...gle.com>
Cc: Will Deacon <will.deacon@....com>
Cc: David Miller <davem@...emloft.net>
Cc: Paul Mundt <lethal@...ux-sh.org>
Cc: Borislav Petkov <bp@...64.org>
---
 kernel/perf_event.c |    2 ++
 1 files changed, 2 insertions(+), 0 deletions(-)

diff --git a/kernel/perf_event.c b/kernel/perf_event.c
index b6e854f..925b53e 100644
--- a/kernel/perf_event.c
+++ b/kernel/perf_event.c
@@ -5364,6 +5364,8 @@ SYSCALL_DEFINE5(perf_event_open,
 
 err_free_put_context:
 	free_event(event);
+	fput_light(group_file, fput_needed);
+	goto err_fd;
 err_put_context:
 	fput_light(group_file, fput_needed);
 	put_ctx(ctx);
-- 
1.6.2.3

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