6.6-stable review patch. If anyone has any objections, please let me know.
------------------
From: Michal Luczaj <mhal@xxxxxxx>
[ Upstream commit 6dafde852df8de3617d4b9f835b629aaeaccd01d ]
Dequeuing via vsock_transport::read_skb() left msg_count outdated, which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@xxxxxxx>
Signed-off-by: Daniel Borkmann <daniel@xxxxxxxxxxxxx>
Reviewed-by: Stefano Garzarella <sgarzare@xxxxxxxxxx>
Acked-by: John Fastabend <john.fastabend@xxxxxxxxx>
Link: https://lore.kernel.org/bpf/20241013-vsock-fixes-for-redir-v2-3-d6577bbfe742@xxxxxxx
Signed-off-by: Sasha Levin <sashal@xxxxxxxxxx>
---
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 072878012b51e..78b5f4f8808b9 100644
--- a/net/vmw_vsock/virtio_transport_common.c
+++ b/net/vmw_vsock/virtio_transport_common.c
@@ -1524,6 +1524,9 @@ 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);
--
2.43.0
