[PATCH 6/7] mss-timer: Use ptimer_free() in the finalize function to avoid memleaks

[Gan Qixin]

When running device-introspect-test, a memory leak occurred in the 
mss_timer_init
function, so use ptimer_free() in the finalize function to avoid it.

ASAN shows memory leak stack:

Indirect leak of 192 byte(s) in 2 object(s) allocated from:
    #0 0xffffab97e1f0 in __interceptor_calloc (/lib64/libasan.so.5+0xee1f0)
    #1 0xffffab256800 in g_malloc0 (/lib64/libglib-2.0.so.0+0x56800)
    #2 0xaaabf555db78 in ptimer_init /qemu/hw/core/ptimer.c:432
    #3 0xaaabf58a0010 in mss_timer_init /qemu/hw/timer/mss-timer.c:235
    #4 0xaaabf6339f6c in object_initialize_with_type /qemu/qom/object.c:515
    #5 0xaaabf633ca04 in object_initialize_child_with_propsv 
/qemu/qom/object.c:564
    #6 0xaaabf633cc08 in object_initialize_child_with_props 
/qemu/qom/object.c:547
    #7 0xaaabf5b8316c in m2sxxx_soc_initfn /qemu/hw/arm/msf2-soc.c:70
    #8 0xaaabf6339f6c in object_initialize_with_type /qemu/qom/object.c:515
    #9 0xaaabf633a1e0 in object_new_with_type /qemu/qom/object.c:729
    #10 0xaaabf6375e40 in qmp_device_list_properties 
/qemu/qom/qom-qmp-cmds.c:153
    #11 0xaaabf653d8ec in qmp_marshal_device_list_properties 
/qemu/qapi/qapi-commands-qdev.c:59
    #12 0xaaabf6587d08 in do_qmp_dispatch_bh /qemu/qapi/qmp-dispatch.c:110

Reported-by: Euler Robot <euler.robot@huawei.com>
Signed-off-by: Gan Qixin <ganqixin@huawei.com>
---
Cc: Subbaraya Sundeep <sundeep.lkml@gmail.com>
---
 hw/timer/mss-timer.c | 23 ++++++++++++++++++-----
 1 file changed, 18 insertions(+), 5 deletions(-)

diff --git a/hw/timer/mss-timer.c b/hw/timer/mss-timer.c
index 29943fd744..7c4f3a52da 100644
--- a/hw/timer/mss-timer.c
+++ b/hw/timer/mss-timer.c
@@ -244,6 +244,18 @@ static void mss_timer_init(Object *obj)
     sysbus_init_mmio(SYS_BUS_DEVICE(obj), &t->mmio);
 }
 
+static void mss_timer_finalize(Object *obj)
+{
+    MSSTimerState *t = MSS_TIMER(obj);
+    int i;
+
+    for (i = 0; i < NUM_TIMERS; i++) {
+        struct Msf2Timer *st = &t->timers[i];
+
+        ptimer_free(st->ptimer);
+    }
+}
+
 static const VMStateDescription vmstate_timers = {
     .name = "mss-timer-block",
     .version_id = 1,
@@ -283,11 +295,12 @@ static void mss_timer_class_init(ObjectClass *klass, void 
*data)
 }
 
 static const TypeInfo mss_timer_info = {
-    .name          = TYPE_MSS_TIMER,
-    .parent        = TYPE_SYS_BUS_DEVICE,
-    .instance_size = sizeof(MSSTimerState),
-    .instance_init = mss_timer_init,
-    .class_init    = mss_timer_class_init,
+    .name              = TYPE_MSS_TIMER,
+    .parent            = TYPE_SYS_BUS_DEVICE,
+    .instance_size     = sizeof(MSSTimerState),
+    .instance_init     = mss_timer_init,
+    .instance_finalize = mss_timer_finalize,
+    .class_init        = mss_timer_class_init,
 };
 
 static void mss_timer_register_types(void)
-- 
2.23.0