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From: | Anthony Liguori |
Subject: | Re: [Qemu-devel] [PATCH 1/8] qapi: fix NULL pointer dereference |
Date: | Fri, 16 Dec 2011 08:10:26 -0600 |
User-agent: | Mozilla/5.0 (X11; U; Linux x86_64; en-US; rv:1.9.2.21) Gecko/20110831 Lightning/1.0b2 Thunderbird/3.1.13 |
On 12/16/2011 08:00 AM, Paolo Bonzini wrote:
On 12/16/2011 02:55 PM, Anthony Liguori wrote:This is visible with qom-get path=/i440fx/piix3 property=romfile after static non-string properties are introduced.I'm a bit confused about what's happening here. What's the significance of non-string properties?Should have been "static non-legacy properties". When you don't have a value for a property, legacy properties are visited as "<null>", while the new static properties do not pass anything to the visitor.
I stole this from qdev_property_get_str: value = prop->get(dev, errp); if (value) { visit_type_str(v, &value, name, errp); g_free(value); }
I should more clearly document it. NULL would be only return if errp was set. I just didn't want to introduce a local_err in order to be able to check whether the function failed.
If a property function does not set the Error pointer, it must visit something. Regards, Anthony Liguori
Paolo
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