linux-kernel - Re: [PATCH] drivers: qcom: rpmh: use struct

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Date:   Mon, 28 Jan 2019 23:12:56 -0600
From:   "Gustavo A. R. Silva" <gustavo@...eddedor.com>
To:     Andy Gross <andy.gross@...aro.org>,
        David Brown <david.brown@...aro.org>
Cc:     linux-arm-msm@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH] drivers: qcom: rpmh: use struct_size() in kzalloc()

Hi all,

Friendly ping:

Who can take this?

Thanks
--
Gustavo

On 1/9/19 11:38 AM, Gustavo A. R. Silva wrote:
> Hi,
> 
> Friendly ping:
> 
> Who can ack or review this patch, please?
> 
> Thanks
> -- 
> Gustavo
> 
> 
> On 12/24/18 12:22 AM, Gustavo A. R. Silva wrote:
>> One of the more common cases of allocation size calculations is finding
>> the size of a structure that has a zero-sized array at the end, along
>> with memory for some number of elements for that array. For example:
>>
>> struct foo {
>>      int stuff;
>>      void *entry[];
>> };
>>
>> instance = kzalloc(sizeof(struct foo) + sizeof(void *) * count, GFP_KERNEL);
>>
>> Instead of leaving these open-coded and prone to type mistakes, we can
>> now use the new struct_size() helper:
>>
>> instance = kzalloc(struct_size(instance, entry, count), GFP_KERNEL);
>>
>> This issue was detected with the help of Coccinelle.
>>
>> Signed-off-by: Gustavo A. R. Silva <gustavo@...eddedor.com>
>> ---
>>   drivers/soc/qcom/rpmh.c | 3 +--
>>   1 file changed, 1 insertion(+), 2 deletions(-)
>>
>> diff --git a/drivers/soc/qcom/rpmh.c b/drivers/soc/qcom/rpmh.c
>> index c7beb6841289..12c057a0b325 100644
>> --- a/drivers/soc/qcom/rpmh.c
>> +++ b/drivers/soc/qcom/rpmh.c
>> @@ -362,8 +362,7 @@ int rpmh_write_batch(const struct device *dev, enum rpmh_state state,
>>       if (!count)
>>           return -EINVAL;
>>   -    req = kzalloc(sizeof(*req) + count * sizeof(req->rpm_msgs[0]),
>> -              GFP_ATOMIC);
>> +    req = kzalloc(struct_size(req, rpm_msgs, count), GFP_ATOMIC);
>>       if (!req)
>>           return -ENOMEM;
>>       req->count = count;
>>