[PATCH 1/3] pl031: Use timer_free() in the finalize function to avoid memleaks

[Gan Qixin <ganqixin@huawei.com>]

When running device-introspect-test, a memory leak occurred in the pl031_init
function, this patch use timer_free() in the finalize function to fix it.

ASAN shows memory leak stack:

Direct leak of 48 byte(s) in 1 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 0xaaabf5621cfc in timer_new_full qemu/include/qemu/timer.h:523
    #3 0xaaabf5621cfc in timer_new qemu/include/qemu/timer.h:544
    #4 0xaaabf5621cfc in timer_new_ns qemu/include/qemu/timer.h:562
    #5 0xaaabf5621cfc in pl031_init qemu/hw/rtc/pl031.c:194
    #6 0xaaabf6339f6c in object_initialize_with_type qemu/qom/object.c:515
    #7 0xaaabf633a1e0 in object_new_with_type qemu/qom/object.c:729
    #8 0xaaabf6375e40 in qmp_device_list_properties qemu/qom/qom-qmp-cmds.c:153
    #9 0xaaabf5a95540 in qdev_device_help qemu/softmmu/qdev-monitor.c:283
    #10 0xaaabf5a96940 in qmp_device_add qemu/softmmu/qdev-monitor.c:801
    #11 0xaaabf5a96e70 in hmp_device_add qemu/softmmu/qdev-monitor.c:916
    #12 0xaaabf5ac0a2c in handle_hmp_command qemu/monitor/hmp.c:1100

Reported-by: Euler Robot <euler.robot@huawei.com>
Signed-off-by: Gan Qixin <ganqixin@huawei.com>
---
Cc: Peter Maydell <peter.maydell@linaro.org>
---
 hw/rtc/pl031.c | 19 ++++++++++++++-----
 1 file changed, 14 insertions(+), 5 deletions(-)

diff --git a/hw/rtc/pl031.c b/hw/rtc/pl031.c
index ae47f09635..2ea3dc1281 100644
--- a/hw/rtc/pl031.c
+++ b/hw/rtc/pl031.c
@@ -194,6 +194,14 @@ static void pl031_init(Object *obj)
     s->timer = timer_new_ns(rtc_clock, pl031_interrupt, s);
 }
 
+static void pl031_finalize(Object *obj)
+{
+    PL031State *s = PL031(obj);
+
+    timer_del(s->timer);
+    timer_free(s->timer);
+}
+
 static int pl031_pre_save(void *opaque)
 {
     PL031State *s = opaque;
@@ -325,11 +333,12 @@ static void pl031_class_init(ObjectClass *klass, void *data)
 }
 
 static const TypeInfo pl031_info = {
-    .name          = TYPE_PL031,
-    .parent        = TYPE_SYS_BUS_DEVICE,
-    .instance_size = sizeof(PL031State),
-    .instance_init = pl031_init,
-    .class_init    = pl031_class_init,
+    .name              = TYPE_PL031,
+    .parent            = TYPE_SYS_BUS_DEVICE,
+    .instance_size     = sizeof(PL031State),
+    .instance_init     = pl031_init,
+    .instance_finalize = pl031_finalize,
+    .class_init        = pl031_class_init,
 };
 
 static void pl031_register_types(void)
-- 
2.27.0