[BlueZ, v4 7/9] unit: Add test for slow element_end() append

This uses 40k iterations as this takes a visible amount of time on a
pretty fast desktop machine (3-4 secs on an i9 9900k).

See: https://github.com/bluez/bluez/security/advisories/GHSA-4p57-mrcv-r2jc
---
 unit/test-sdp-xml.c | 46 +++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 46 insertions(+)

diff --git a/unit/test-sdp-xml.c b/unit/test-sdp-xml.c
index 9bf35235423b..5aa98334eabc 100644
--- a/unit/test-sdp-xml.c
+++ b/unit/test-sdp-xml.c
@@ -65,6 +65,47 @@ static void parse_xml_for_filename(gconstpointer data)
 	g_free(path);
 }
 
+#define XML_START						\
+	"<?xml version=\"1.0\" encoding=\"UTF-8\" ?>\n"		\
+	"<record>\n"						\
+	"	<attribute id=\"0x0004\">\n"			\
+	"		<sequence>"
+
+#define XML_VALUE						\
+	"			<uint8 value=\"0x01\" />\n"
+
+#define XML_END							\
+	"		</sequence>\n"				\
+	"	</attribute>\n"					\
+	"</record>"
+
+static void sequence_on_squared(gconstpointer data)
+{
+	struct test_data *t = (struct test_data *) data;
+	parse_xml(t->s->str, t->s->len, TRUE);
+}
+
+static void sequence_on_squared_setup(gconstpointer data)
+{
+	struct test_data *t = (struct test_data *) data;
+	guint i;
+
+	t->s = g_string_new(XML_START);
+	for (i = 0; i < 40000; i++)
+		t->s = g_string_append(t->s, XML_VALUE);
+	t->s = g_string_append(t->s, XML_END);
+
+	tester_setup_complete();
+}
+
+static void sequence_on_squared_teardown(gconstpointer data)
+{
+	struct test_data *t = (struct test_data *) data;
+
+	g_string_free(t->s, TRUE);
+	tester_teardown_complete();
+}
+
 #define DEFINE_TEST(fname, res) {					\
 	data.expected_result = res;					\
 	data.filename = fname;						\
@@ -85,5 +126,10 @@ int main(int argc, char *argv[])
 	/* From https://github.com/bluez/bluez/security/advisories/GHSA-75v6-6q44-57hc */
 	DEFINE_TEST("duplicate-attribute.xml", TRUE);
 
+	tester_add("/sequence_on_squared", &data,
+		   sequence_on_squared_setup,
+		   sequence_on_squared,
+		   sequence_on_squared_teardown);
+
 	return tester_run();
 }
-- 
2.55.0