netdev - [RFC PATCH v1 3/3] virtio/vsock: remove all data from sk

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Date:   Sat, 4 Mar 2023 01:02:29 +0300
From:   Arseniy Krasnov <avkrasnov@...rdevices.ru>
To:     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>
CC:     <kvm@...r.kernel.org>, <virtualization@...ts.linux-foundation.org>,
        <netdev@...r.kernel.org>, <linux-kernel@...r.kernel.org>,
        <kernel@...rdevices.ru>, <oxffffaa@...il.com>,
        <avkrasnov@...rdevices.ru>
Subject: [RFC PATCH v1 3/3] virtio/vsock: remove all data from sk_buff

In case of SOCK_SEQPACKET all sk_buffs are used once - after read some
data from it, it will be removed, so user will never read rest of the
data. Thus we need to update credit parameters of the socket like whole
sk_buff is read - so call 'skb_pull()' for the whole buffer.

Fixes: 71dc9ec9ac7d ("virtio/vsock: replace virtio_vsock_pkt with sk_buff")
Signed-off-by: Arseniy Krasnov <AVKrasnov@...rdevices.ru>
---
 net/vmw_vsock/virtio_transport_common.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/net/vmw_vsock/virtio_transport_common.c b/net/vmw_vsock/virtio_transport_common.c
index d80075e1db42..bbcf331b6ad6 100644
--- a/net/vmw_vsock/virtio_transport_common.c
+++ b/net/vmw_vsock/virtio_transport_common.c
@@ -470,7 +470,7 @@ static int virtio_transport_seqpacket_do_dequeue(struct vsock_sock *vsk,
 					dequeued_len = err;
 				} else {
 					user_buf_len -= bytes_to_copy;
-					skb_pull(skb, bytes_to_copy);
+					skb_pull(skb, skb->len);
 				}
 
 				spin_lock_bh(&vvs->rx_lock);
-- 
2.25.1