linux-kernel - [tip:perf/core] tools lib traceevent: Set int_array fields to NULL if freeing from error

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Date:	Sat, 5 Mar 2016 00:19:30 -0800
From:	"tip-bot for Steven Rostedt (Red Hat)" <tipbot@...or.com>
To:	linux-tip-commits@...r.kernel.org
Cc:	acme@...hat.com, akpm@...ux-foundation.org, tglx@...utronix.de,
	rostedt@...dmis.org, linux-kernel@...r.kernel.org,
	mingo@...nel.org, hpa@...or.com
Subject: [tip:perf/core] tools lib traceevent: Set int_array fields to NULL
 if freeing from error

Commit-ID:  9ec72eafee61f68cd57310a99db129ffb71302f3
Gitweb:     http://git.kernel.org/tip/9ec72eafee61f68cd57310a99db129ffb71302f3
Author:     Steven Rostedt (Red Hat) <rostedt@...dmis.org>
AuthorDate: Tue, 9 Feb 2016 15:40:16 -0500
Committer:  Arnaldo Carvalho de Melo <acme@...hat.com>
CommitDate: Thu, 3 Mar 2016 11:10:38 -0300

tools lib traceevent: Set int_array fields to NULL if freeing from error

Had a bug where on error of parsing __print_array() where the fields are
freed after they were allocated, but since they were not set to NULL,
the freeing of the arg also tried to free the already freed fields
causing a double free.

Fix process_hex() while at it.

Signed-off-by: Steven Rostedt <rostedt@...dmis.org>
Cc: Andrew Morton <akpm@...ux-foundation.org>
Link: http://lkml.kernel.org/r/20160209204237.188327674@goodmis.org
Signed-off-by: Arnaldo Carvalho de Melo <acme@...hat.com>
---
 tools/lib/traceevent/event-parse.c | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/tools/lib/traceevent/event-parse.c b/tools/lib/traceevent/event-parse.c
index ce59f48..fb790aa 100644
--- a/tools/lib/traceevent/event-parse.c
+++ b/tools/lib/traceevent/event-parse.c
@@ -2635,6 +2635,7 @@ process_hex(struct event_format *event, struct print_arg *arg, char **tok)
 
 free_field:
 	free_arg(arg->hex.field);
+	arg->hex.field = NULL;
 out:
 	*tok = NULL;
 	return EVENT_ERROR;
@@ -2659,8 +2660,10 @@ process_int_array(struct event_format *event, struct print_arg *arg, char **tok)
 
 free_size:
 	free_arg(arg->int_array.count);
+	arg->int_array.count = NULL;
 free_field:
 	free_arg(arg->int_array.field);
+	arg->int_array.field = NULL;
 out:
 	*tok = NULL;
 	return EVENT_ERROR;