linux-kernel - [tip:tracing/syscalls] tracing/core: fix early free of cpumasks

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Date:	Mon, 16 Mar 2009 08:19:33 GMT
From:	Frederic Weisbecker <fweisbec@...il.com>
To:	linux-tip-commits@...r.kernel.org
Cc:	linux-kernel@...r.kernel.org, hpa@...or.com, mingo@...hat.com,
	fweisbec@...il.com, tglx@...utronix.de, mingo@...e.hu
Subject: [tip:tracing/syscalls] tracing/core: fix early free of cpumasks

Commit-ID:  2fc1dfbe17e7705c55b7a99da995fa565e26f151
Gitweb:     http://git.kernel.org/tip/2fc1dfbe17e7705c55b7a99da995fa565e26f151
Author:     Frederic Weisbecker <fweisbec@...il.com>
AuthorDate: Mon, 16 Mar 2009 01:45:03 +0100
Commit:     Ingo Molnar <mingo@...e.hu>
CommitDate: Mon, 16 Mar 2009 09:13:18 +0100

tracing/core: fix early free of cpumasks

Impact: fix crashes when tracing cpumasks

While ring-buffer allocation, the cpumasks are allocated too,
including the tracing cpumask and the per-cpu file mask handler.
But these cpumasks are freed accidentally just after.
Fix it.

Reported-by: Ingo Molnar <mingo@...e.hu>
Signed-off-by: Frederic Weisbecker <fweisbec@...il.com>
LKML-Reference: <1237164303-11476-1-git-send-email-fweisbec@...il.com>
Signed-off-by: Ingo Molnar <mingo@...e.hu>


---
 kernel/trace/trace.c |    3 ++-
 1 files changed, 2 insertions(+), 1 deletions(-)

diff --git a/kernel/trace/trace.c b/kernel/trace/trace.c
index c0cf946..ae32d3b 100644
--- a/kernel/trace/trace.c
+++ b/kernel/trace/trace.c
@@ -4125,7 +4125,8 @@ __init static int tracer_alloc_buffers(void)
 				       &trace_panic_notifier);
 
 	register_die_notifier(&trace_die_notifier);
-	ret = 0;
+
+	return 0;
 
 out_free_cpumask:
 	free_cpumask_var(tracing_reader_cpumask);
--
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