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

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Message-ID: <105407a6e7fc28b57cbe5550b8c01c45@cornelisnetworks.com>
Date:   Thu, 08 Oct 2020 13:21:23 -0400
From:   dennis.dalessandro@...nelisnetworks.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>,
        Ira Weiny <ira.weiny@...el.com>, linux-rdma@...r.kernel.org,
        kernel-janitors@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH] IB/rdmavt: Fix sizeof mismatch

On 2020-10-08 05:52, 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>
> ---
> 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);

Acked-by: Dennis Dalessandro <dennis.dalessandro@...nelisnetworks.com>