linux-kernel - Re: [PATCH 09/26] pds_core: use array

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Message-ID: <cd1d3939-d5a5-2d30-ffbb-cedab71a4536@amd.com>
Date:   Mon, 26 Jun 2023 09:02:30 -0700
From:   Shannon Nelson <shannon.nelson@....com>
To:     Julia Lawall <Julia.Lawall@...ia.fr>
Cc:     keescook@...omium.org, kernel-janitors@...r.kernel.org,
        Brett Creeley <brett.creeley@....com>,
        "David S. Miller" <davem@...emloft.net>,
        Eric Dumazet <edumazet@...gle.com>,
        Jakub Kicinski <kuba@...nel.org>,
        Paolo Abeni <pabeni@...hat.com>, netdev@...r.kernel.org,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH 09/26] pds_core: use array_size

On 6/23/23 2:14 PM, Julia Lawall wrote:
> 
> Use array_size to protect against multiplication overflows.
> 
> The changes were done using the following Coccinelle semantic patch:
> 
> // <smpl>
> @@
>      expression E1, E2;
>      constant C1, C2;
>      identifier alloc = {vmalloc,vzalloc};
> @@
> 
> (
>        alloc(C1 * C2,...)
> |
>        alloc(
> -           (E1) * (E2)
> +           array_size(E1, E2)
>        ,...)
> )
> // </smpl>
> 
> Signed-off-by: Julia Lawall <Julia.Lawall@...ia.fr>

Thanks,
Acked-by: Shannon Nelson <shannon.nelson@....com>

> 
> ---
>   drivers/net/ethernet/amd/pds_core/core.c |    4 ++--
>   1 file changed, 2 insertions(+), 2 deletions(-)
> 
> diff --git a/drivers/net/ethernet/amd/pds_core/core.c b/drivers/net/ethernet/amd/pds_core/core.c
> index 483a070d96fa..d87f45a1ee2f 100644
> --- a/drivers/net/ethernet/amd/pds_core/core.c
> +++ b/drivers/net/ethernet/amd/pds_core/core.c
> @@ -196,7 +196,7 @@ int pdsc_qcq_alloc(struct pdsc *pdsc, unsigned int type, unsigned int index,
>          dma_addr_t q_base_pa;
>          int err;
> 
> -       qcq->q.info = vzalloc(num_descs * sizeof(*qcq->q.info));
> +       qcq->q.info = vzalloc(array_size(num_descs, sizeof(*qcq->q.info)));
>          if (!qcq->q.info) {
>                  err = -ENOMEM;
>                  goto err_out;
> @@ -219,7 +219,7 @@ int pdsc_qcq_alloc(struct pdsc *pdsc, unsigned int type, unsigned int index,
>          if (err)
>                  goto err_out_free_q_info;
> 
> -       qcq->cq.info = vzalloc(num_descs * sizeof(*qcq->cq.info));
> +       qcq->cq.info = vzalloc(array_size(num_descs, sizeof(*qcq->cq.info)));
>          if (!qcq->cq.info) {
>                  err = -ENOMEM;
>                  goto err_out_free_irq;
>