linux-kernel - [PATCH v2 2/5] tools lib traceevent: Do not link broken field arg for an old ftrace event

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Date:	Mon, 18 Jun 2012 11:50:48 +0900
From:	Namhyung Kim <namhyung@...nel.org>
To:	Steven Rostedt <rostedt@...dmis.org>,
	Arnaldo Carvalho de Melo <acme@...stprotocols.net>
Cc:	Frederic Weisbecker <fweisbec@...il.com>,
	Peter Zijlstra <a.p.zijlstra@...llo.nl>,
	Ingo Molnar <mingo@...nel.org>,
	LKML <linux-kernel@...r.kernel.org>,
	Namhyung Kim <namhyung.kim@....com>
Subject: [PATCH v2 2/5] tools lib traceevent: Do not link broken field arg for an old ftrace event

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

Defer linking a newly allocated arg to print_fmt.args until
all of its field is setup so that later access to ->field.name
cannot be NULL.

Cc: Frederic Weisbecker <fweisbec@...il.com>
Acked-by: Steven Rostedt <rostedt@...dmis.org>
Link: http://lkml.kernel.org/n/tip-7zlkindw0qqqe5h117u59ood@git.kernel.org
Signed-off-by: Namhyung Kim <namhyung@...nel.org>
---
 tools/lib/traceevent/event-parse.c |    6 +++---
 1 file changed, 3 insertions(+), 3 deletions(-)

diff --git a/tools/lib/traceevent/event-parse.c b/tools/lib/traceevent/event-parse.c
index 4f667fdc5fae..ae172e2ee958 100644
--- a/tools/lib/traceevent/event-parse.c
+++ b/tools/lib/traceevent/event-parse.c
@@ -4658,20 +4658,20 @@ int pevent_parse_event(struct pevent *pevent,
 		struct print_arg *arg, **list;
 
 		/* old ftrace had no args */
-
 		list = &event->print_fmt.args;
 		for (field = event->format.fields; field; field = field->next) {
 			arg = alloc_arg();
-			*list = arg;
-			list = &arg->next;
 			arg->type = PRINT_FIELD;
 			arg->field.name = strdup(field->name);
 			if (!arg->field.name) {
 				do_warning("failed to allocate field name");
 				event->flags |= EVENT_FL_FAILED;
+				free_arg(arg);
 				return -1;
 			}
 			arg->field.field = field;
+			*list = arg;
+			list = &arg->next;
 		}
 		return 0;
 	}
-- 
1.7.10.2

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