linux-kernel - [PATCH 12/22] lib/traceevent: Fix a possibly wrong memory dereference

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Message-Id: <1337740619-27925-13-git-send-email-namhyung.kim@lge.com>
Date:	Wed, 23 May 2012 11:36:49 +0900
From:	Namhyung Kim <namhyung.kim@....com>
To:	Arnaldo Carvalho de Melo <acme@...stprotocols.net>
Cc:	Peter Zijlstra <a.p.zijlstra@...llo.nl>,
	Paul Mackerras <paulus@...ba.org>,
	Ingo Molnar <mingo@...hat.com>,
	Namhyung Kim <namhyung@...il.com>,
	LKML <linux-kernel@...r.kernel.org>,
	Steven Rostedt <rostedt@...dmis.org>,
	Frederic Weisbecker <fweisbec@...il.com>,
	Ingo Molnar <mingo@...nel.org>,
	Arnaldo Carvalho de Melo <acme@...radead.org>,
	Borislav Petkov <bp@...en8.de>, David Ahern <dsahern@...il.com>
Subject: [PATCH 12/22] lib/traceevent: Fix a possibly wrong memory dereference

If set_op_prio() failed, the token will be freed at out_free,
then arg->op.op would turn out to be a dangle pointer. After
returning EVENT_ERROR from process_op(), free_arg() will be
called and then it will finally see the dangling pointer.

Link: http://lkml.kernel.org/r/1333940074-19052-8-git-send-email-namhyung.kim@lge.com

Signed-off-by: Namhyung Kim <namhyung.kim@....com>
Cc: Frederic Weisbecker <fweisbec@...il.com>
Cc: Ingo Molnar <mingo@...nel.org>
Cc: Arnaldo Carvalho de Melo <acme@...radead.org>
Cc: Borislav Petkov <bp@...en8.de>
Cc: David Ahern <dsahern@...il.com>
Signed-off-by: Steven Rostedt <rostedt@...dmis.org>
---
 tools/lib/traceevent/event-parse.c |    2 ++
 1 file changed, 2 insertions(+)

diff --git a/tools/lib/traceevent/event-parse.c b/tools/lib/traceevent/event-parse.c
index 6a8e3169ac68..865d0f268274 100644
--- a/tools/lib/traceevent/event-parse.c
+++ b/tools/lib/traceevent/event-parse.c
@@ -1747,6 +1747,8 @@ process_op(struct event_format *event, struct print_arg *arg, char **tok)
 
 		if (set_op_prio(arg) == -1) {
 			event->flags |= EVENT_FL_FAILED;
+			/* arg->op.op (= token) will be freed at out_free */
+			arg->op.op = NULL;
 			goto out_free;
 		}
 
-- 
1.7.10.1

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