[PATCH 3.16 116/148] libtraceevent: Fix memory leakage in copy_filter_type

[Ben Hutchings]

3.16.82-rc1 review patch.  If anyone has any objections, please let me know.

------------------

From: Hewenliang <hewenliang4@xxxxxxxxxx>

commit 10992af6bf46a2048ad964985a5b77464e5563b1 upstream.

It is necessary to free the memory that we have allocated when error occurs.

Fixes: ef3072cd1d5c ("tools lib traceevent: Get rid of die in add_filter_type()")
Signed-off-by: Hewenliang <hewenliang4@xxxxxxxxxx>
Reviewed-by: Steven Rostedt (VMware) <rostedt@xxxxxxxxxxx>
Cc: Tzvetomir Stoyanov <tstoyanov@xxxxxxxxxx>
Link: http://lore.kernel.org/lkml/20191119014415.57210-1-hewenliang4@xxxxxxxxxx
Signed-off-by: Steven Rostedt (VMware) <rostedt@xxxxxxxxxxx>
Signed-off-by: Arnaldo Carvalho de Melo <acme@xxxxxxxxxx>
Signed-off-by: Ben Hutchings <ben@xxxxxxxxxxxxxxx>
---
 tools/lib/traceevent/parse-filter.c | 9 +++++++--
 1 file changed, 7 insertions(+), 2 deletions(-)

--- a/tools/lib/traceevent/parse-filter.c
+++ b/tools/lib/traceevent/parse-filter.c
@@ -1482,8 +1482,10 @@ static int copy_filter_type(struct event
 	if (strcmp(str, "TRUE") == 0 || strcmp(str, "FALSE") == 0) {
 		/* Add trivial event */
 		arg = allocate_arg();
-		if (arg == NULL)
+		if (arg == NULL) {
+			free(str);
 			return -1;
+		}
 
 		arg->type = FILTER_ARG_BOOLEAN;
 		if (strcmp(str, "TRUE") == 0)
@@ -1492,8 +1494,11 @@ static int copy_filter_type(struct event
 			arg->boolean.value = 0;
 
 		filter_type = add_filter_type(filter, event->id);
-		if (filter_type == NULL)
+		if (filter_type == NULL) {
+			free(str);
+			free_arg(arg);
 			return -1;
+		}
 
 		filter_type->filter = arg;