[PATCH net-next v14 02/12] virtio: set skb owner of virtio_transport_reset_no_sock() reply
From: Bobby Eshleman <hidden>
Date: 2026-01-13 03:12:58
Also in:
kvm, linux-hyperv, linux-kselftest, lkml, virtualization
Subsystem:
networking [general], the rest, virtio and vhost vsock driver, virtio core, vm sockets (af_vsock) · Maintainers:
"David S. Miller", Eric Dumazet, Jakub Kicinski, Paolo Abeni, Linus Torvalds, Stefan Hajnoczi, Stefano Garzarella, "Michael S. Tsirkin", Jason Wang
From: Bobby Eshleman <redacted> Associate reply packets with the sending socket. When vsock must reply with an RST packet and there exists a sending socket (e.g., for loopback), setting the skb owner to the socket correctly handles reference counting between the skb and sk (i.e., the sk stays alive until the skb is freed). This allows the net namespace to be used for socket lookups for the duration of the reply skb's lifetime, preventing race conditions between the namespace lifecycle and vsock socket search using the namespace pointer. Reviewed-by: Stefano Garzarella <sgarzare@redhat.com> Signed-off-by: Bobby Eshleman <redacted> --- Changes in v11: - move before adding to netns support (Stefano) Changes in v10: - break this out into its own patch for easy revert (Stefano) --- net/vmw_vsock/virtio_transport_common.c | 6 ++++++ 1 file changed, 6 insertions(+)
diff --git a/net/vmw_vsock/virtio_transport_common.c b/net/vmw_vsock/virtio_transport_common.c
index fdb8f5b3fa60..718be9f33274 100644
--- a/net/vmw_vsock/virtio_transport_common.c
+++ b/net/vmw_vsock/virtio_transport_common.c@@ -1165,6 +1165,12 @@ static int virtio_transport_reset_no_sock(const struct virtio_transport *t, .op = VIRTIO_VSOCK_OP_RST, .type = le16_to_cpu(hdr->type), .reply = true, + + /* Set sk owner to socket we are replying to (may be NULL for + * non-loopback). This keeps a reference to the sock and + * sock_net(sk) until the reply skb is freed. + */ + .vsk = vsock_sk(skb->sk), }; struct sk_buff *reply;
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2.47.3