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Re: [PATCH v2] pl031: add finalize function to avoid memleaks

From: Philippe Mathieu-Daudé
Subject: Re: [PATCH v2] pl031: add finalize function to avoid memleaks
Date: Tue, 4 Feb 2020 08:20:28 +0100
User-agent: Mozilla/5.0 (X11; Linux x86_64; rv:68.0) Gecko/20100101 Thunderbird/68.4.1

On 2/4/20 3:05 AM, address@hidden wrote:
From: Pan Nengyuan <address@hidden>

There is a memory leak when we call 'device_list_properties' with
typename = pl031. It's easy to reproduce as follow:

   virsh qemu-monitor-command vm1 --pretty '{"execute": "device-list-properties", "arguments": 
{"typename": "pl031"}}'

The memory leak stack:
   Direct leak of 48 byte(s) in 1 object(s) allocated from:
     #0 0x7f6e0925a970 in __interceptor_calloc (/lib64/libasan.so.5+0xef970)
     #1 0x7f6e06f4d49d in g_malloc0 (/lib64/libglib-2.0.so.0+0x5249d)
     #2 0x564a0f7654ea in timer_new_full /mnt/sdb/qemu/include/qemu/timer.h:530
     #3 0x564a0f76555d in timer_new /mnt/sdb/qemu/include/qemu/timer.h:551
     #4 0x564a0f765589 in timer_new_ns /mnt/sdb/qemu/include/qemu/timer.h:569
     #5 0x564a0f76747d in pl031_init /mnt/sdb/qemu/hw/rtc/pl031.c:198
     #6 0x564a0fd4a19d in object_init_with_type /mnt/sdb/qemu/qom/object.c:360
     #7 0x564a0fd4b166 in object_initialize_with_type 
     #8 0x564a0fd4c8e6 in object_new_with_type /mnt/sdb/qemu/qom/object.c:636
     #9 0x564a0fd4c98e in object_new /mnt/sdb/qemu/qom/object.c:646
     #10 0x564a0fc69d43 in qmp_device_list_properties 
     #11 0x564a0ef18e64 in qdev_device_help /mnt/sdb/qemu/qdev-monitor.c:278

Reported-by: Euler Robot <address@hidden>
Signed-off-by: Pan Nengyuan <address@hidden>
Changes V2 to V1:
- Delay the timer_new until realize instead of putting it into instance_init, 
since the pl031 can't be hotplugged(suggested by Peter Maydell).
  hw/rtc/pl031.c | 5 +++++
  1 file changed, 5 insertions(+)

diff --git a/hw/rtc/pl031.c b/hw/rtc/pl031.c
index ae47f09635..0b9253eb30 100644
--- a/hw/rtc/pl031.c
+++ b/hw/rtc/pl031.c
@@ -190,7 +190,11 @@ static void pl031_init(Object *obj)
      qemu_get_timedate(&tm, 0);
      s->tick_offset = mktimegm(&tm) -
          qemu_clock_get_ns(rtc_clock) / NANOSECONDS_PER_SECOND;
+static void pl031_realize(DeviceState *dev, Error **errp)
+    PL031State *s = PL031(dev);
      s->timer = timer_new_ns(rtc_clock, pl031_interrupt, s);
@@ -321,6 +325,7 @@ static void pl031_class_init(ObjectClass *klass, void *data)
      DeviceClass *dc = DEVICE_CLASS(klass);
dc->vmsd = &vmstate_pl031;
+    dc->realize = pl031_realize;
      device_class_set_props(dc, pl031_properties);

Reviewed-by: Philippe Mathieu-Daudé <address@hidden>

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