[tip:perf/core] tools lib traceevent: Copy trace_clock and free it

[tip-bot for Steven Rostedt (Red Hat)]

Commit-ID:  99ad1417db2e83530b88e3eff1a40285d6ebfee9
Gitweb:     http://git.kernel.org/tip/99ad1417db2e83530b88e3eff1a40285d6ebfee9
Author:     Steven Rostedt (Red Hat) <rostedt@xxxxxxxxxxx>
AuthorDate: Tue, 24 Mar 2015 09:57:50 -0400
Committer:  Arnaldo Carvalho de Melo <acme@xxxxxxxxxx>
CommitDate: Tue, 24 Mar 2015 12:11:19 -0300

tools lib traceevent: Copy trace_clock and free it

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@xxxxxxxxxxx>
Cc: Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx>
Cc: Jiri Olsa <jolsa@xxxxxxxxxx>
Cc: Namhyung Kim <namhyung@xxxxxxxxxx>
Link: http://lkml.kernel.org/r/20150324135922.695906738@xxxxxxxxxxx
Signed-off-by: Arnaldo Carvalho de Melo <acme@xxxxxxxxxx>
---
 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 31d4e7d..e71c472 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 {
@@ -6352,6 +6357,7 @@ 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 6abda54..84e554f 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,
--
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