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[bpf,3/4] vsock: Update msg_count on read_skb()

Message ID 20241009-vsock-fixes-for-redir-v1-3-e455416f6d78@rbox.co (mailing list archive)
State Superseded
Delegated to: BPF
Headers show
Series bpf, vsock: Fixes related to sockmap/sockhash redirection | expand

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Commit Message

Michal Luczaj Oct. 9, 2024, 9:20 p.m. UTC 
Dequeuing via vsock_transport::read_skb() left msg_count outdated, which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@rbox.co>
---
 net/vmw_vsock/virtio_transport_common.c | 3 +++
 1 file changed, 3 insertions(+)

Comments

Stefano Garzarella Oct. 10, 2024, 8:51 a.m. UTC | #1 
On Wed, Oct 09, 2024 at 11:20:52PM GMT, Michal Luczaj wrote:
>Dequeuing via vsock_transport::read_skb() left msg_count outdated, which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@rbox.co>
>---
> net/vmw_vsock/virtio_transport_common.c | 3 +++
> 1 file changed, 3 insertions(+)

Thanks for fixing this!

Reviewed-by: Stefano Garzarella <sgarzare@redhat.com>

>
>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
>
diff mbox series

Patch

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);