linux-kernel - [PATCH 7/7] parse-events: Fix a possibly wrong memory dereference

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Date:	Mon,  9 Apr 2012 11:54:34 +0900
From:	Namhyung Kim <namhyung.kim@....com>
To:	Steven Rostedt <rostedt@...dmis.org>,
	Frederic Weisbecker <fweisbec@...il.com>,
	Ingo Molnar <mingo@...nel.org>
Cc:	Arnaldo Carvalho de Melo <acme@...radead.org>,
	Borislav Petkov <bp@...en8.de>,
	David Ahern <dsahern@...il.com>,
	LKML <linux-kernel@...r.kernel.org>
Subject: [PATCH 7/7] parse-events: 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.

Signed-off-by: Namhyung Kim <namhyung.kim@....com>
---
 parse-events.c |    2 ++
 1 files changed, 2 insertions(+), 0 deletions(-)

diff --git a/parse-events.c b/parse-events.c
index e789275..bd078ba 100644
--- a/parse-events.c
+++ b/parse-events.c
@@ -1741,6 +1741,8 @@ 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;
 		}
 
-- 
1.7.7.6

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