[PATCH] libtraceevent: Fix bug in tep_print_event()

From: "Yordan Karadzhov (VMware)" <y.karadz@gmail.com>
To: rostedt@goodmis.org
Cc: linux-trace-devel@vger.kernel.org,
	"Yordan Karadzhov (VMware)" <y.karadz@gmail.com>
Subject: [PATCH] libtraceevent: Fix bug in tep_print_event()
Date: Wed, 30 Jun 2021 17:19:13 +0300	[thread overview]
Message-ID: <20210630141913.20675-1-y.karadz@gmail.com> (raw)

We must handle the case when the "tep_event" object is not found.

Signed-off-by: Yordan Karadzhov (VMware) <y.karadz@gmail.com>
---
 src/event-parse.c | 12 ++++++++----
 1 file changed, 8 insertions(+), 4 deletions(-)

diff --git a/src/event-parse.c b/src/event-parse.c
index de28b3b..d3f1bba 100644
--- a/src/event-parse.c
+++ b/src/event-parse.c
@@ -6418,17 +6418,21 @@ void tep_print_event(struct tep_handle *tep, struct trace_seq *s,
 		     struct tep_record *record, const char *fmt, ...)
 {
 	struct print_event_type type;
-	char *format = strdup(fmt);
-	char *current = format;
-	char *str = format;
+	char *format, *current, *str;
 	int offset;
 	va_list args;
 	struct tep_event *event;
 
+	event = tep_find_event_by_record(tep, record);
+	if (!event) {
+		trace_seq_printf(s, "[UNKNOWN EVENT]");
+		return;
+	}
+
+	str = current = format = strdup(fmt);
 	if (!format)
 		return;
 
-	event = tep_find_event_by_record(tep, record);
 	va_start(args, fmt);
 	while (*current) {
 		current = strchr(str, '%');
-- 
2.27.0

