netdev - [PATCH bpf 3/4] vsock: Update msg_count on read

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Message-Id: <20241009-vsock-fixes-for-redir-v1-3-e455416f6d78@rbox.co>
Date: Wed, 09 Oct 2024 23:20:52 +0200
From: Michal Luczaj <mhal@...x.co>
To: "David S. Miller" <davem@...emloft.net>, 
 Eric Dumazet <edumazet@...gle.com>, Jakub Kicinski <kuba@...nel.org>, 
 Paolo Abeni <pabeni@...hat.com>, John Fastabend <john.fastabend@...il.com>, 
 Jakub Sitnicki <jakub@...udflare.com>, 
 "Michael S. Tsirkin" <mst@...hat.com>, 
 Stefano Garzarella <sgarzare@...hat.com>, 
 Bobby Eshleman <bobby.eshleman@...edance.com>, 
 Stefan Hajnoczi <stefanha@...hat.com>
Cc: netdev@...r.kernel.org, bpf@...r.kernel.org, 
 Michal Luczaj <mhal@...x.co>
Subject: [PATCH bpf 3/4] vsock: Update msg_count on read_skb()

Dequeuing via vsock_transport::read_skb() left msg_count outdated, which
then confused SOCK_SEQPACKET recv(). Decrease the counter.

Fixes: 634f1a7110b4 ("vsock: support sockmap")
Signed-off-by: Michal Luczaj <mhal@...x.co>
---
 net/vmw_vsock/virtio_transport_common.c | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/net/vmw_vsock/virtio_transport_common.c b/net/vmw_vsock/virtio_transport_common.c
index ed1c1bed5700e5988a233cea146cf9fac95426e0..1d591b69ede3244a4f49aa44dc1f939d827dafc0 100644
--- a/net/vmw_vsock/virtio_transport_common.c
+++ b/net/vmw_vsock/virtio_transport_common.c
@@ -1723,6 +1723,9 @@ int virtio_transport_read_skb(struct vsock_sock *vsk, skb_read_actor_t recv_acto
 	}

 	hdr = virtio_vsock_hdr(skb);
+	if (le32_to_cpu(hdr->flags) & VIRTIO_VSOCK_SEQ_EOM)
+		vvs->msg_count--;
+
 	virtio_transport_dec_rx_pkt(vvs, le32_to_cpu(hdr->len));
 	spin_unlock_bh(&vvs->rx_lock);

-- 
2.46.2