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From: Xiao Guangrong <guangrong.xiao@linux.intel.com>
Message-ID: <56318B5F.8010600@linux.intel.com>
Date: Thu, 29 Oct 2015 10:58:39 +0800
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Subject: Re: [Qemu-devel] [PATCH v5 29/33] nvdimm acpi: support Get
 Namespace Label Data function
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To: Stefan Hajnoczi <stefanha@redhat.com>
Cc: ehabkost@redhat.com, kvm@vger.kernel.org, mst@redhat.com, gleb@kernel.org, mtosatti@redhat.com, qemu-devel@nongnu.org, imammedo@redhat.com, pbonzini@redhat.com, dan.j.williams@intel.com, rth@twiddle.net



On 10/29/2015 10:25 AM, Xiao Guangrong wrote:
>
>
> On 10/29/2015 12:46 AM, Stefan Hajnoczi wrote:
>> On Wed, Oct 28, 2015 at 10:26:27PM +0000, Xiao Guangrong wrote:
>>> +static void nvdimm_dsm_func_get_label_data(NVDIMMDevice *nvdimm,
>>> +                                           nvdimm_dsm_in *in, GArray *out)
>>> +{
>>> +    NVDIMMClass *nvc = NVDIMM_GET_CLASS(nvdimm);
>>> +    nvdimm_func_in_get_label_data *get_label_data = &in->func_get_label_data;
>>> +    void *buf;
>>> +    uint32_t status = NVDIMM_DSM_STATUS_SUCCESS;
>>> +
>>> +    le32_to_cpus(&get_label_data->offset);
>>> +    le32_to_cpus(&get_label_data->length);
>>> +
>>> +    nvdimm_debug("Read Label Data: offset %#x length %#x.\n",
>>> +                 get_label_data->offset, get_label_data->length);
>>> +
>>> +    if (nvdimm->label_size < get_label_data->offset + get_label_data->length) {
>>
>> Integer overflow isn't handled here and it's unclear if that can cause
>> problems later on.  It's safest to catch it right away instead of
>> relying on nvc->read_label_data() to check again.
>>
>
> Good catch, Stefan! I will fix it by adding a additional check:
>
> if (get_label_data->offset + get_label_data->length > get_label_data->offset) {
                                                       <
Sorry for the typo.