trace-cmd: Copy field name in old string processing

In processing old print-fmt's (and also when the print format does not contain
args), the arg field name points directly to the field name. But on at the
end it will free the field name twice. One for the arg and one for the field.
The name needs to be strdup().

Reported-by: Lai Jiangshan <laijs@cn.fujitsu.com>
Signed-off-by: Steven Rostedt <rostedt@goodmis.org>

1 files changed, 1 insertions, 1 deletions

diff --git a/parse-events.c b/parse-events.c
index e48900a..cac5ed3 100644
--- a/parse-events.c
+++ b/parse-events.c
@@ -4327,7 +4327,7 @@ int pevent_parse_event(struct pevent *pevent,
                         *list = arg;
                         list = &arg->next;
                         arg->type = PRINT_FIELD;
-                        arg->field.name = field->name;
+                        arg->field.name = strdup(field->name);
                         arg->field.field = field;
                 }
                 return 0;