linux-kernel - [tip:perf/urgent] perf: Don't call release_callchain

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Date:	Sun, 22 Jan 2012 13:07:22 -0800
From:	tip-bot for Namhyung Kim <namhyung.kim@....com>
To:	linux-tip-commits@...r.kernel.org
Cc:	linux-kernel@...r.kernel.org, paulus@...ba.org, hpa@...or.com,
	mingo@...hat.com, a.p.zijlstra@...llo.nl, acme@...stprotocols.net,
	namhyung.kim@....com, namhyung@...il.com, fweisbec@...il.com,
	tglx@...utronix.de, mingo@...e.hu
Subject: [tip:perf/urgent] perf: Don't call release_callchain_buffers()
  if allocation fails

Commit-ID:  fd45c15f13e754f3c106427e857310f3e0813951
Gitweb:     http://git.kernel.org/tip/fd45c15f13e754f3c106427e857310f3e0813951
Author:     Namhyung Kim <namhyung.kim@....com>
AuthorDate: Fri, 20 Jan 2012 10:12:45 +0900
Committer:  Ingo Molnar <mingo@...e.hu>
CommitDate: Sat, 21 Jan 2012 09:33:41 +0100

perf: Don't call release_callchain_buffers() if allocation fails

When alloc_callchain_buffers() fails, it frees all of
entries before return. In addition, calling the
release_callchain_buffers() will cause a NULL pointer
dereference since callchain_cpu_entries is not set.

Signed-off-by: Namhyung Kim <namhyung.kim@....com>
Acked-by: Frederic Weisbecker <fweisbec@...il.com>
Cc: Namhyung Kim <namhyung@...il.com>
Cc: Peter Zijlstra <a.p.zijlstra@...llo.nl>
Cc: Paul Mackerras <paulus@...ba.org>
Cc: Arnaldo Carvalho de Melo <acme@...stprotocols.net>
Link: http://lkml.kernel.org/r/1327021966-27688-1-git-send-email-namhyung.kim@lge.com
Signed-off-by: Ingo Molnar <mingo@...e.hu>
---
 kernel/events/callchain.c |    2 --
 1 files changed, 0 insertions(+), 2 deletions(-)

diff --git a/kernel/events/callchain.c b/kernel/events/callchain.c
index 057e24b..6581a04 100644
--- a/kernel/events/callchain.c
+++ b/kernel/events/callchain.c
@@ -115,8 +115,6 @@ int get_callchain_buffers(void)
 	}
 
 	err = alloc_callchain_buffers();
-	if (err)
-		release_callchain_buffers();
 exit:
 	mutex_unlock(&callchain_mutex);
 
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