[Qemu-devel] [PATCH v2] audio: es1370: unregister reset call on exit

[P J P <ppandit@redhat.com>]

From: Prasad J Pandit <pjp@fedoraproject.org>

ES1370 audio device emulator registers a device reset call with
Qemu during initialisation. But the same is not unregistered when
audio device is unplugged. This leads to a use-after-free error
during reboot, as Qemu resets the machine. Add 'es1370_exit'
PCIDeviceClass method to unregister reset call.

Reported-by: Huawei PSIRT <PSIRT@huawei.com>
Signed-off-by: Prasad J Pandit <pjp@fedoraproject.org>
---
 hw/audio/es1370.c | 7 +++++++
 1 file changed, 7 insertions(+)

Update: remove space between function name and parenthesis
  -> https://lists.gnu.org/archive/html/qemu-devel/2016-11/msg04257.html

diff --git a/hw/audio/es1370.c b/hw/audio/es1370.c
index 8449b5f..97f6f41 100644
--- a/hw/audio/es1370.c
+++ b/hw/audio/es1370.c
@@ -1047,12 +1047,19 @@ static int es1370_init (PCIBus *bus)
     return 0;
 }
 
+static void es1370_exit(PCIDevice *dev)
+{
+    ES1370State *s = ES1370(dev);
+    qemu_unregister_reset(es1370_on_reset, s);
+}
+
 static void es1370_class_init (ObjectClass *klass, void *data)
 {
     DeviceClass *dc = DEVICE_CLASS (klass);
     PCIDeviceClass *k = PCI_DEVICE_CLASS (klass);
 
     k->realize = es1370_realize;
+    k->exit = es1370_exit;
     k->vendor_id = PCI_VENDOR_ID_ENSONIQ;
     k->device_id = PCI_DEVICE_ID_ENSONIQ_ES1370;
     k->class_id = PCI_CLASS_MULTIMEDIA_AUDIO;
-- 
2.7.4