[PATCH] tests/qtest: Plug memory leaks in qtest_get_machines

[Fabiano Rosas <farosas@suse.de>]

These leaks can be avoided:

 759 bytes in 61 blocks are still reachable in loss record 56 of 60
    at 0x4034744: malloc (in /usr/lib/valgrind/vgpreload_memcheck-amd64-linux.so)
    by 0x4A88518: g_malloc (in /usr/lib64/libglib-2.0.so.0.7000.5)
    by 0x4AA313E: g_strdup (in /usr/lib64/libglib-2.0.so.0.7000.5)
    by 0x12083E: qtest_get_machines (libqtest.c:1323)
    by 0x12098C: qtest_cb_for_every_machine (libqtest.c:1348)
    by 0x11556C: main (test-hmp.c:160)

 992 bytes in 1 blocks are still reachable in loss record 57 of 60
    at 0x4034744: malloc (in /usr/lib/valgrind/vgpreload_memcheck-amd64-linux.so)
    by 0x4A88518: g_malloc (in /usr/lib64/libglib-2.0.so.0.7000.5)
    by 0x120725: qtest_get_machines (libqtest.c:1313)
    by 0x12098C: qtest_cb_for_every_machine (libqtest.c:1348)
    by 0x11556C: main (test-hmp.c:160)

Signed-off-by: Fabiano Rosas <farosas@suse.de>
---
 tests/qtest/libqtest.c | 14 ++++++++++++++
 1 file changed, 14 insertions(+)

diff --git a/tests/qtest/libqtest.c b/tests/qtest/libqtest.c
index 6b2216cb20..65abac5029 100644
--- a/tests/qtest/libqtest.c
+++ b/tests/qtest/libqtest.c
@@ -1285,6 +1285,18 @@ struct MachInfo {
     char *alias;
 };
 
+static void qtest_free_machine_info(gpointer data)
+{
+    struct MachInfo *machines = data;
+    int i;
+
+    for (i = 0; machines[i].name != NULL; i++) {
+        g_free((void *)machines[i].name);
+        g_free((void *)machines[i].alias);
+    }
+    g_free(machines);
+}
+
 /*
  * Returns an array with pointers to the available machine names.
  * The terminating entry has the name set to NULL.
@@ -1336,6 +1348,8 @@ static struct MachInfo *qtest_get_machines(void)
     qobject_unref(response);
 
     memset(&machines[idx], 0, sizeof(struct MachInfo)); /* Terminating entry */
+    g_test_queue_destroy(qtest_free_machine_info, machines);
+
     return machines;
 }
 
-- 
2.35.3