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

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Message-ID: <20230320135814.jncpvznka56liu36@sgarzare-redhat>
Date:   Mon, 20 Mar 2023 14:58:14 +0100
From:   Stefano Garzarella <sgarzare@...hat.com>
To:     Arseniy Krasnov <avkrasnov@...rdevices.ru>
Cc:     Stefan Hajnoczi <stefanha@...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: [RFC PATCH v1] virtio/vsock: check transport before skb
 allocation

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@...rdevices.ru>
>---
> 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@...hat.com>

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
>