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SubjectRe: [PATCH] nvmet-fc: use zero-sized array and struct_size() in kzalloc()
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On 2/23/19 2:28 PM, Gustavo A. R. Silva wrote:
> Hey Joe,
>
> On 2/23/19 2:05 PM, Joe Perches wrote:
>> On Sat, 2019-02-23 at 12:51 -0600, Gustavo A. R. Silva wrote:
>>> Update the code to use a zero-sized array instead of a pointer in
>>> structure nvmet_fc_tgt_queue and use struct_size() in kzalloc().
>> []
>>> This code was detected with the help of Coccinelle.
>>
>> Really?
>> Impressive script that found this one.
>>
>
> See my comments below.
>
>>> diff --git a/drivers/nvme/target/fc.c b/drivers/nvme/target/fc.c
>> []
>>> @@ -128,12 +128,12 @@ struct nvmet_fc_tgt_queue {
>>> struct nvmet_cq nvme_cq;
>>> struct nvmet_sq nvme_sq;
>>> struct nvmet_fc_tgt_assoc *assoc;
>>> - struct nvmet_fc_fcp_iod *fod; /* array of fcp_iods */
>>> struct list_head fod_list;
>>> struct list_head pending_cmd_list;
>>> struct list_head avail_defer_list;
>>> struct workqueue_struct *work_q;
>>> struct kref ref;
>>> + struct nvmet_fc_fcp_iod fod[]; /* array of fcp_iods */
>>> } __aligned(sizeof(unsigned long long));
>>
>> Moving a pointer from the middle of a struct to
>> the end seems unusual for coccinelle.
>>
>>
>
> Notice that the commit log says "detected", which does not imply
> the script made the transformation by itself. :)
>
> And all the script detected was this piece of code:
>
> queue = kzalloc((sizeof(*queue) +
> (sizeof(struct nvmet_fc_fcp_iod) * sqsize)),
> GFP_KERNEL);
>
>

Which is enough to mention the tool.

Thanks
--
Gustavo

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