netdev - Re: [PATCH net-next v1] virtio/vsock: check transport before skb allocation

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Date:   Tue, 21 Mar 2023 10:16:22 +0530
From:   Pavan Chebbi <pavan.chebbi@...adcom.com>
To:     Arseniy Krasnov <avkrasnov@...rdevices.ru>
Cc:     Stefan Hajnoczi <stefanha@...hat.com>,
        Stefano Garzarella <sgarzare@...hat.com>,
        "David S. Miller" <davem@...emloft.net>,
        Eric Dumazet <edumazet@...gle.com>,
        Jakub Kicinski <kuba@...nel.org>,
        Paolo Abeni <pabeni@...hat.com>,
        Bobby Eshleman <bobby.eshleman@...edance.com>,
        kvm@...r.kernel.org, virtualization@...ts.linux-foundation.org,
        netdev@...r.kernel.org, linux-kernel@...r.kernel.org,
        kernel@...rdevices.ru, oxffffaa@...il.com
Subject: Re: [PATCH net-next v1] virtio/vsock: check transport before skb allocation

On Mon, Mar 20, 2023 at 11:25 PM Arseniy Krasnov
<avkrasnov@...rdevices.ru> wrote:
>
> Pointer to transport could be checked before allocation of skbuff, thus
> there is no need to free skbuff when this pointer is NULL.
>
> Signed-off-by: Arseniy Krasnov <AVKrasnov@...rdevices.ru>
> Reviewed-by: Bobby Eshleman <bobby.eshleman@...edance.com>
> Reviewed-by: Stefano Garzarella <sgarzare@...hat.com>
> ---

Looks good to me.
Reviewed-by: Pavan Chebbi <pavan.chebbi@...adcom.com>

>  net/vmw_vsock/virtio_transport_common.c | 8 +++-----
>  1 file changed, 3 insertions(+), 5 deletions(-)
>
> diff --git a/net/vmw_vsock/virtio_transport_common.c b/net/vmw_vsock/virtio_transport_common.c
> index cda587196475..607149259e8b 100644
> --- a/net/vmw_vsock/virtio_transport_common.c
> +++ b/net/vmw_vsock/virtio_transport_common.c
> @@ -867,6 +867,9 @@ static int virtio_transport_reset_no_sock(const struct virtio_transport *t,
>         if (le16_to_cpu(hdr->op) == VIRTIO_VSOCK_OP_RST)
>                 return 0;
>
> +       if (!t)
> +               return -ENOTCONN;
> +
>         reply = virtio_transport_alloc_skb(&info, 0,
>                                            le64_to_cpu(hdr->dst_cid),
>                                            le32_to_cpu(hdr->dst_port),
> @@ -875,11 +878,6 @@ static int virtio_transport_reset_no_sock(const struct virtio_transport *t,
>         if (!reply)
>                 return -ENOMEM;
>
> -       if (!t) {
> -               kfree_skb(reply);
> -               return -ENOTCONN;
> -       }
> -
>         return t->send_pkt(reply);
>  }
>
> --
> 2.25.1

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