[PATCH 4/7] exynos4210_pwm: Use ptimer_free() in the finalize function to avoid memleaks

[Gan Qixin]

When running device-introspect-test, a memory leak occurred in the 
exynos4210_pwm_init
function, so use ptimer_free() in the finalize function to avoid it.

ASAN shows memory leak stack:

Indirect leak of 240 byte(s) in 5 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 0xaaabf555db84 in timer_new_full /qemu/include/qemu/timer.h:523
    #3 0xaaabf555db84 in timer_new /qemu/include/qemu/timer.h:544
    #4 0xaaabf555db84 in timer_new_ns /qemu/include/qemu/timer.h:562
    #5 0xaaabf555db84 in ptimer_init /qemu/hw/core/ptimer.c:433
    #6 0xaaabf56a36cc in exynos4210_pwm_init /qemu/hw/timer/exynos4210_pwm.c:401
    #7 0xaaabf6339f6c in object_initialize_with_type /qemu/qom/object.c:515
    #8 0xaaabf633a1e0 in object_new_with_type /qemu/qom/object.c:729
    #9 0xaaabf6375e40 in qmp_device_list_properties /qemu/qom/qom-qmp-cmds.c:153
    #10 0xaaabf653d8ec in qmp_marshal_device_list_properties 
/qemu/qapi/qapi-commands-qdev.c:59
    #11 0xaaabf6587d08 in do_qmp_dispatch_bh /qemu/qapi/qmp-dispatch.c:110
    #12 0xaaabf6552708 in aio_bh_call /qemu/util/async.c:136

Reported-by: Euler Robot <euler.robot@huawei.com>
Signed-off-by: Gan Qixin <ganqixin@huawei.com>
---
Cc: Igor Mitsyanko <i.mitsyanko@gmail.com>
---
 hw/timer/exynos4210_pwm.c | 21 ++++++++++++++++-----
 1 file changed, 16 insertions(+), 5 deletions(-)

diff --git a/hw/timer/exynos4210_pwm.c b/hw/timer/exynos4210_pwm.c
index de181428b4..4764164d5e 100644
--- a/hw/timer/exynos4210_pwm.c
+++ b/hw/timer/exynos4210_pwm.c
@@ -410,6 +410,16 @@ static void exynos4210_pwm_init(Object *obj)
     sysbus_init_mmio(dev, &s->iomem);
 }
 
+static void exynos4210_pwm_finalize(Object *obj)
+{
+    Exynos4210PWMState *s = EXYNOS4210_PWM(obj);
+    int i;
+
+    for (i = 0; i < EXYNOS4210_PWM_TIMERS_NUM; i++) {
+        ptimer_free(s->timer[i].ptimer);
+    }
+}
+
 static void exynos4210_pwm_class_init(ObjectClass *klass, void *data)
 {
     DeviceClass *dc = DEVICE_CLASS(klass);
@@ -419,11 +429,12 @@ static void exynos4210_pwm_class_init(ObjectClass *klass, 
void *data)
 }
 
 static const TypeInfo exynos4210_pwm_info = {
-    .name          = TYPE_EXYNOS4210_PWM,
-    .parent        = TYPE_SYS_BUS_DEVICE,
-    .instance_size = sizeof(Exynos4210PWMState),
-    .instance_init = exynos4210_pwm_init,
-    .class_init    = exynos4210_pwm_class_init,
+    .name              = TYPE_EXYNOS4210_PWM,
+    .parent            = TYPE_SYS_BUS_DEVICE,
+    .instance_size     = sizeof(Exynos4210PWMState),
+    .instance_init     = exynos4210_pwm_init,
+    .instance_finalize = exynos4210_pwm_finalize,
+    .class_init        = exynos4210_pwm_class_init,
 };
 
 static void exynos4210_pwm_register_types(void)
-- 
2.23.0