[lttng-dev] [PATCH babeltrace] Fix ctf-writer: Reject enumerations containing no mappings

[jeremie.galarneau@efficios.com (Jérémie Galarneau)]

Signed-off-by: J?r?mie Galarneau <jeremie.galarneau at efficios.com>
---
 formats/ctf/writer/event-fields.c                  |  4 +--
 formats/ctf/writer/event-types.c                   | 40 +++++++++++++++++++---
 .../babeltrace/ctf-writer/event-types-internal.h   |  3 ++
 3 files changed, 40 insertions(+), 7 deletions(-)

diff --git a/formats/ctf/writer/event-fields.c b/formats/ctf/writer/event-fields.c
index ff970c0..ad4fcb5 100644
--- a/formats/ctf/writer/event-fields.c
+++ b/formats/ctf/writer/event-fields.c
@@ -179,8 +179,8 @@ struct bt_ctf_field *bt_ctf_field_create(struct bt_ctf_field_type *type)
 	}
 
 	type_id = bt_ctf_field_type_get_type_id(type);
-	if (type_id <= CTF_TYPE_UNKNOWN ||
-		type_id >= NR_CTF_TYPES) {
+	if (type_id <= CTF_TYPE_UNKNOWN || type_id >= NR_CTF_TYPES ||
+		bt_ctf_field_type_validate(type)) {
 		goto error;
 	}
 
diff --git a/formats/ctf/writer/event-types.c b/formats/ctf/writer/event-types.c
index fa4e713..4ed9fed 100644
--- a/formats/ctf/writer/event-types.c
+++ b/formats/ctf/writer/event-types.c
@@ -238,6 +238,27 @@ end:
 	return ret;
 }
 
+BT_HIDDEN
+int bt_ctf_field_type_validate(struct bt_ctf_field_type *type)
+{
+	int ret = 0;
+
+	if (!type) {
+		ret = -1;
+		goto end;
+	}
+
+	if (type->declaration->id == CTF_TYPE_ENUM) {
+		struct bt_ctf_field_type_enumeration *enumeration =
+			container_of(type, struct bt_ctf_field_type_enumeration,
+			parent);
+
+		ret = enumeration->entries->len ? 0 : -1;
+	}
+end:
+	return ret;
+}
+
 struct bt_ctf_field_type *bt_ctf_field_type_integer_create(unsigned int size)
 {
 	struct bt_ctf_field_type_integer *integer =
@@ -517,7 +538,8 @@ int bt_ctf_field_type_structure_add_field(struct bt_ctf_field_type *type,
 
 	if (!type || !field_type || type->frozen ||
 		validate_identifier(field_name) ||
-		(type->declaration->id != CTF_TYPE_STRUCT)) {
+		(type->declaration->id != CTF_TYPE_STRUCT) ||
+		bt_ctf_field_type_validate(field_type)) {
 		goto end;
 	}
 
@@ -579,7 +601,8 @@ int bt_ctf_field_type_variant_add_field(struct bt_ctf_field_type *type,
 
 	if (!type || !field_type || type->frozen ||
 		validate_identifier(field_name) ||
-		(type->declaration->id != CTF_TYPE_VARIANT)) {
+		(type->declaration->id != CTF_TYPE_VARIANT) ||
+		bt_ctf_field_type_validate(field_type)) {
 		ret = -1;
 		goto end;
 	}
@@ -611,7 +634,8 @@ struct bt_ctf_field_type *bt_ctf_field_type_array_create(
 {
 	struct bt_ctf_field_type_array *array = NULL;
 
-	if (!element_type || length == 0) {
+	if (!element_type || length == 0 ||
+		bt_ctf_field_type_validate(element_type)) {
 		goto error;
 	}
 
@@ -639,7 +663,8 @@ struct bt_ctf_field_type *bt_ctf_field_type_sequence_create(
 {
 	struct bt_ctf_field_type_sequence *sequence = NULL;
 
-	if (!element_type || validate_identifier(length_field_name)) {
+	if (!element_type || validate_identifier(length_field_name) ||
+		bt_ctf_field_type_validate(element_type)) {
 		goto error;
 	}
 
@@ -1154,10 +1179,15 @@ int bt_ctf_field_type_enumeration_serialize(struct bt_ctf_field_type *type,
 		struct metadata_context *context)
 {
 	size_t entry;
-	int ret = 0;
+	int ret;
 	struct bt_ctf_field_type_enumeration *enumeration = container_of(type,
 		struct bt_ctf_field_type_enumeration, parent);
 
+	ret = bt_ctf_field_type_validate(type);
+	if (ret) {
+		goto end;
+	}
+
 	g_string_append(context->string, "enum : ");
 	ret = bt_ctf_field_type_serialize(enumeration->container, context);
 	if (ret) {
diff --git a/include/babeltrace/ctf-writer/event-types-internal.h b/include/babeltrace/ctf-writer/event-types-internal.h
index d9acdd3..a937c78 100644
--- a/include/babeltrace/ctf-writer/event-types-internal.h
+++ b/include/babeltrace/ctf-writer/event-types-internal.h
@@ -147,4 +147,7 @@ BT_HIDDEN
 int bt_ctf_field_type_serialize(struct bt_ctf_field_type *type,
 		struct metadata_context *context);
 
+BT_HIDDEN
+int bt_ctf_field_type_validate(struct bt_ctf_field_type *type);
+
 #endif /* BABELTRACE_CTF_WRITER_EVENT_TYPES_INTERNAL_H */
-- 
1.8.4.2