lkml.org 
[lkml]   [2019]   [Jan]   [29]   [last100]   RSS Feed
Views: [wrap][no wrap]   [headers]  [forward] 
 
Messages in this thread
/
SubjectRe: [PATCH] drivers: qcom: rpmh: use struct_size() in kzalloc()
From
Date


On 1/28/19 11:26 PM, Amit Kucheria wrote:
> On Mon, Dec 24, 2018 at 11:52 AM Gustavo A. R. Silva
> <gustavo@embeddedor.com> 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@embeddedor.com>
>
> Reviewed-by: Amit Kucheria <amit.kucheria@linaro.org>
>

Thanks, Amit.

--
Gustavo

>> ---
>> 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;
>> --
>> 2.17.0
>>

\
 
 \ /
  Last update: 2019-01-29 07:58    [W:0.093 / U:10.808 seconds]
©2003-2020 Jasper Spaans|hosted at Digital Ocean and TransIP|Read the blog|Advertise on this site