linux-kernel - Re: [PATCH] IB/rdmavt: Fix sizeof mismatch

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Date:   Thu, 8 Oct 2020 09:41:16 -0700
From:   Ira Weiny <ira.weiny@...el.com>
To:     Colin King <colin.king@...onical.com>
Cc:     Dennis Dalessandro <dennis.dalessandro@...el.com>,
        Mike Marciniszyn <mike.marciniszyn@...el.com>,
        Doug Ledford <dledford@...hat.com>,
        Jason Gunthorpe <jgg@...pe.ca>, linux-rdma@...r.kernel.org,
        kernel-janitors@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH] IB/rdmavt: Fix sizeof mismatch

On Thu, Oct 08, 2020 at 10:52:04AM +0100, Colin King wrote:
> From: Colin Ian King <colin.king@...onical.com>
> 
> An incorrect sizeof is being used, struct rvt_ibport ** is not correct,
> it should be struct rvt_ibport *. Note that since ** is the same size as
> * this is not causing any issues.  Improve this fix by using
> sizeof(*rdi->ports) as this allows us to not even reference the type
> of the pointer.  Also remove line breaks as the entire statement can
> fit on one line.
> 
> Addresses-Coverity: ("Sizeof not portable (SIZEOF_MISMATCH)")
> Fixes: ff6acd69518e ("IB/rdmavt: Add device structure allocation")
> Signed-off-by: Colin Ian King <colin.king@...onical.com>

Reviewed-by: Ira Weiny <ira.weiny@...el.com>

> ---
>  drivers/infiniband/sw/rdmavt/vt.c | 4 +---
>  1 file changed, 1 insertion(+), 3 deletions(-)
> 
> diff --git a/drivers/infiniband/sw/rdmavt/vt.c b/drivers/infiniband/sw/rdmavt/vt.c
> index f904bb34477a..2d534c450f3c 100644
> --- a/drivers/infiniband/sw/rdmavt/vt.c
> +++ b/drivers/infiniband/sw/rdmavt/vt.c
> @@ -95,9 +95,7 @@ struct rvt_dev_info *rvt_alloc_device(size_t size, int nports)
>  	if (!rdi)
>  		return rdi;
>  
> -	rdi->ports = kcalloc(nports,
> -			     sizeof(struct rvt_ibport **),
> -			     GFP_KERNEL);
> +	rdi->ports = kcalloc(nports, sizeof(*rdi->ports), GFP_KERNEL);
>  	if (!rdi->ports)
>  		ib_dealloc_device(&rdi->ibdev);
>  
> -- 
> 2.27.0
>