linux-kernel - Re: [PATCH] amd/pds_core: core: No need for Null pointer check before kfree

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Message-ID: <74296600-6d91-4353-a9f6-fdb1ed724a59@intel.com>
Date:   Wed, 25 Oct 2023 11:22:28 +0200
From:   Wojciech Drewek <wojciech.drewek@...el.com>
To:     Bragatheswaran Manickavel <bragathemanick0908@...il.com>,
        <shannon.nelson@....com>, <brett.creeley@....com>,
        <davem@...emloft.net>, <edumazet@...gle.com>, <kuba@...nel.org>,
        <pabeni@...hat.com>
CC:     <netdev@...r.kernel.org>, <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH] amd/pds_core: core: No need for Null pointer check before
 kfree



On 24.10.2023 20:20, Bragatheswaran Manickavel wrote:
> kfree()/vfree() internally perform NULL check on the
> pointer handed to it and take no action if it indeed is
> NULL. Hence there is no need for a pre-check of the memory
> pointer before handing it to kfree()/vfree().
> 
> Issue reported by ifnullfree.cocci Coccinelle semantic
> patch script.
> 
> Signed-off-by: Bragatheswaran Manickavel <bragathemanick0908@...il.com>
> ---

Thanks for the patch!
One nit, you're missing a target tag. It should be [PATCH net-next] since this not a fix IMO.
Reviewed-by: Wojciech Drewek <wojciech.drewek@...el.com>

>  drivers/net/ethernet/amd/pds_core/core.c | 7 ++-----
>  1 file changed, 2 insertions(+), 5 deletions(-)
> 
> diff --git a/drivers/net/ethernet/amd/pds_core/core.c b/drivers/net/ethernet/amd/pds_core/core.c
> index 2a8643e167e1..0d2091e9eb28 100644
> --- a/drivers/net/ethernet/amd/pds_core/core.c
> +++ b/drivers/net/ethernet/amd/pds_core/core.c
> @@ -152,11 +152,8 @@ void pdsc_qcq_free(struct pdsc *pdsc, struct pdsc_qcq *qcq)
>  		dma_free_coherent(dev, qcq->cq_size,
>  				  qcq->cq_base, qcq->cq_base_pa);
>  
> -	if (qcq->cq.info)
> -		vfree(qcq->cq.info);
> -
> -	if (qcq->q.info)
> -		vfree(qcq->q.info);
> +	vfree(qcq->cq.info);
> +	vfree(qcq->q.info);
>  
>  	memset(qcq, 0, sizeof(*qcq));
>  }