linux-kernel - Re: [PATCH] RDMA/ucma: Use struct

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Date:   Fri, 14 Jun 2019 15:39:14 +0200
From:   "Enrico Weigelt, metux IT consult" <lkml@...ux.net>
To:     "Gustavo A. R. Silva" <gustavo@...eddedor.com>,
        Doug Ledford <dledford@...hat.com>,
        Jason Gunthorpe <jgg@...pe.ca>
Cc:     linux-rdma@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH] RDMA/ucma: Use struct_size() helper

On 04.06.19 17:42, Gustavo A. R. Silva wrote:

Hi,

<snip>

> diff --git a/drivers/infiniband/core/ucma.c b/drivers/infiniband/core/ucma.c
> index 140a338a135f..cbe460076611 100644
> --- a/drivers/infiniband/core/ucma.c
> +++ b/drivers/infiniband/core/ucma.c
> @@ -951,8 +951,7 @@ static ssize_t ucma_query_path(struct ucma_context *ctx,
>  		}
>  	}
>  
> -	if (copy_to_user(response, resp,
> -			 sizeof(*resp) + (i * sizeof(struct ib_path_rec_data))))
> +	if (copy_to_user(response, resp, struct_size(resp, path_data, i)))
>  		ret = -EFAULT;

have you already considered further reducing the boilerplate by putting
this into it's own helper macro, so it finally would look like this ?

+	if (copy_to_user_structs(response, resp, resp, path_data, i)))
>  		ret = -EFAULT;

You've posted similar patches that also affected things like kzalloc().
Maybe for those it would be better candidates for putting everything
into its own helper macro ? (I've already got that on my 2do list, but
not sure whether maintainers really like to be bothered with those
kind of patches ;-)).


--mtx

-- 
Enrico Weigelt, metux IT consult
Free software and Linux embedded engineering
info@...ux.net -- +49-151-27565287