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pc: fix possible NULL pointer dereference in pc_machine_get_device_memory_region_size() 

QEMU will crash when device-memory-region-size property is read if ms->device_memory
wasn't initialized yet.

Crash can be reproduced with:
 $QEMU -preconfig -qmp unix:qmp_socket,server,nowait &
 ./scripts/qmp/qom-get -s qmp_socket /machine.device-memory-region-size

Instead of crashing return 0 if ms->device_memory hasn't been initialized.

Signed-off-by: Igor Mammedov <imammedo@redhat.com>
Message-Id: <20190624090200.5383-1-imammedo@redhat.com>
Signed-off-by: Eduardo Habkost <ehabkost@redhat.com>
master
Igor Mammedov 2019-06-24 05:02:00 -04:00 committed by Eduardo Habkost
parent d65af288a8
commit fc3b77e20d
1 changed files with 5 additions and 1 deletions
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6
hw/i386/pc.c
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@ -2553,7 +2553,11 @@ pc_machine_get_device_memory_region_size(Object *obj, Visitor *v,
Error **errp)
{
MachineState *ms = MACHINE(obj);
int64_t value = memory_region_size(&ms->device_memory->mr);
int64_t value = 0;
if (ms->device_memory) {
value = memory_region_size(&ms->device_memory->mr);
}
visit_type_int(v, name, &value, errp);
}