linux-kernel - [PATCH] perf script: Fix a NULL pointer dereference

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Date:	Tue, 14 Aug 2012 10:57:03 +0900
From:	Namhyung Kim <namhyung@...nel.org>
To:	Arnaldo Carvalho de Melo <acme@...stprotocols.net>
Cc:	Peter Zijlstra <a.p.zijlstra@...llo.nl>,
	Paul Mackerras <paulus@...ba.org>,
	Ingo Molnar <mingo@...nel.org>,
	LKML <linux-kernel@...r.kernel.org>,
	Namhyung Kim <namhyung.kim@....com>,
	Feng Tang <feng.tang@...el.com>
Subject: [PATCH] perf script: Fix a NULL pointer dereference

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

If 'perf script --gen-script' was called with a perf.data which
contains no tracepoint event, it'd segfault due to NULL pevent
pointer. Fix it.

Cc: Feng Tang <feng.tang@...el.com>
Signed-off-by: Namhyung Kim <namhyung@...nel.org>
---
 tools/perf/util/trace-event-parse.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/tools/perf/util/trace-event-parse.c b/tools/perf/util/trace-event-parse.c
index 4cb7f3831f78..a5a554efeb50 100644
--- a/tools/perf/util/trace-event-parse.c
+++ b/tools/perf/util/trace-event-parse.c
@@ -293,7 +293,7 @@ struct event_format *trace_find_next_event(struct pevent *pevent,
 {
 	static int idx;
 
-	if (!pevent->events)
+	if (!pevent || !pevent->events)
 		return NULL;
 
 	if (!event) {
-- 
1.7.11.2

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