Re: [RFC PATCH v1] virtio/vsock: check transport before skb allocation

[Stefano Garzarella]

On Fri, Mar 17, 2023 at 01:37:10PM +0300, Arseniy Krasnov 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@xxxxxxxxxxxxxx>
> ---
> net/vmw_vsock/virtio_transport_common.c | 8 +++-----
> 1 file changed, 3 insertions(+), 5 deletions(-)

LGTM, I think net-next is fine for this.

Reviewed-by: Stefano Garzarella <sgarzare@xxxxxxxxxx>

Thanks,
Stefano

> 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