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Re: [Qemu-devel] [PATCH] qdev: Fix use after free in qdev_init_nofail er
From: |
Paolo Bonzini |
Subject: |
Re: [Qemu-devel] [PATCH] qdev: Fix use after free in qdev_init_nofail error path |
Date: |
Tue, 2 Aug 2016 08:43:04 +0200 |
User-agent: |
Mozilla/5.0 (X11; Linux x86_64; rv:45.0) Gecko/20100101 Thunderbird/45.1.1 |
On 02/08/2016 06:00, John Snow wrote:
>
>
> On 08/01/2016 11:41 PM, Fam Zheng wrote:
>> Since 69382d8b (qdev: Fix object reference leak in case device.realize()
>> fails), object_property_set_bool could release the object. The error
>> path wants the type name, so hold an reference before realizing it.
>>
>> Cc: Igor Mammedov <address@hidden>
>> Signed-off-by: Fam Zheng <address@hidden>
>> ---
>> hw/core/qdev.c | 2 ++
>> 1 file changed, 2 insertions(+)
>>
>> diff --git a/hw/core/qdev.c b/hw/core/qdev.c
>> index ee4a083..5783442 100644
>> --- a/hw/core/qdev.c
>> +++ b/hw/core/qdev.c
>> @@ -354,12 +354,14 @@ void qdev_init_nofail(DeviceState *dev)
>>
>> assert(!dev->realized);
>>
>> + object_ref(OBJECT(dev));
>> object_property_set_bool(OBJECT(dev), true, "realized", &err);
>> if (err) {
>> error_reportf_err(err, "Initialization of device %s failed: ",
>> object_get_typename(OBJECT(dev)));
>> exit(1);
>> }
>> + object_unref(OBJECT(dev));
>> }
>>
>> void qdev_machine_creation_done(void)
>>
>
> Thanks :)
>
> (For the list: this fixes qcow2 iotest 051. This is for-2.7.)
>
> Reviewed-by: John Snow <address@hidden>
Queued, thanks.
Paolo