linux-kernel - [33/75] tracing: Fix double free when function profile init failed

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Message-ID: <lsq.1366640759.669509943@decadent.org.uk>
Date:	Mon, 22 Apr 2013 15:25:59 +0100
From:	Ben Hutchings <ben@...adent.org.uk>
To:	linux-kernel@...r.kernel.org, stable@...r.kernel.org
CC:	akpm@...ux-foundation.org, "Namhyung Kim" <namhyung.kim@....com>,
	"Namhyung Kim" <namhyung@...nel.org>,
	"Frederic Weisbecker" <fweisbec@...il.com>,
	"Steven Rostedt" <rostedt@...dmis.org>
Subject: [33/75] tracing: Fix double free when function profile init failed

3.2.44-rc1 review patch.  If anyone has any objections, please let me know.

------------------

From: Namhyung Kim <namhyung.kim@....com>

commit 83e03b3fe4daffdebbb42151d5410d730ae50bd1 upstream.

On the failure path, stat->start and stat->pages will refer same page.
So it'll attempt to free the same page again and get kernel panic.

Link: http://lkml.kernel.org/r/1364820385-32027-1-git-send-email-namhyung@kernel.org

Cc: Frederic Weisbecker <fweisbec@...il.com>
Cc: Namhyung Kim <namhyung.kim@....com>
Signed-off-by: Namhyung Kim <namhyung@...nel.org>
Signed-off-by: Steven Rostedt <rostedt@...dmis.org>
Signed-off-by: Ben Hutchings <ben@...adent.org.uk>
---
 kernel/trace/ftrace.c |    1 -
 1 file changed, 1 deletion(-)

--- a/kernel/trace/ftrace.c
+++ b/kernel/trace/ftrace.c
@@ -572,7 +572,6 @@ int ftrace_profile_pages_init(struct ftr
 		free_page(tmp);
 	}
 
-	free_page((unsigned long)stat->pages);
 	stat->pages = NULL;
 	stat->start = NULL;
 

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