[PATCH 2/9] tools lib traceevent: Copy trace_clock and free it

[Steven Rostedt <rostedt@goodmis.org>]

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From: "Steven Rostedt (Red Hat)" <rostedt@goodmis.org>

The pevent->trace_clock should not be a direct pointer to what
was given. It should be copied and freed.

Note, valgrind pointed this out when a caller passed in a pointer
that needed to be freed and it never was. Ideally, pevent should
copy it (which this change does), and free the copy. It's up
to the caller to free the clock string passed in.

Signed-off-by: Steven Rostedt <rostedt@goodmis.org>
---
 tools/lib/traceevent/event-parse.c | 10 ++++++++--
 tools/lib/traceevent/event-parse.h |  2 +-
 2 files changed, 9 insertions(+), 3 deletions(-)

diff --git a/tools/lib/traceevent/event-parse.c b/tools/lib/traceevent/event-parse.c
index fdcb89be5e67..9709e202a7e5 100644
--- a/tools/lib/traceevent/event-parse.c
+++ b/tools/lib/traceevent/event-parse.c
@@ -321,9 +321,14 @@ int pevent_register_comm(struct pevent *pevent, const char *comm, int pid)
 	return 0;
 }
 
-void pevent_register_trace_clock(struct pevent *pevent, char *trace_clock)
+int pevent_register_trace_clock(struct pevent *pevent, const char *trace_clock)
 {
-	pevent->trace_clock = trace_clock;
+	pevent->trace_clock = strdup(trace_clock);
+	if (!pevent->trace_clock) {
+		errno = ENOMEM;
+		return -1;
+	}
+	return 0;
 }
 
 struct func_map {
@@ -6349,6 +6354,7 @@ void pevent_free(struct pevent *pevent)
 		free_handler(handle);
 	}
 
+	free(pevent->trace_clock);
 	free(pevent->events);
 	free(pevent->sort_events);
 
diff --git a/tools/lib/traceevent/event-parse.h b/tools/lib/traceevent/event-parse.h
index 6abda54d76f2..84e554f84574 100644
--- a/tools/lib/traceevent/event-parse.h
+++ b/tools/lib/traceevent/event-parse.h
@@ -599,7 +599,7 @@ enum trace_flag_type {
 };
 
 int pevent_register_comm(struct pevent *pevent, const char *comm, int pid);
-void pevent_register_trace_clock(struct pevent *pevent, char *trace_clock);
+int pevent_register_trace_clock(struct pevent *pevent, const char *trace_clock);
 int pevent_register_function(struct pevent *pevent, char *name,
 			     unsigned long long addr, char *mod);
 int pevent_register_print_string(struct pevent *pevent, const char *fmt,
-- 
2.1.4