From f7154d967bc4ee25ea1572937550e711b2525474 Mon Sep 17 00:00:00 2001 From: Arseniy Krasnov Date: Tue, 28 Mar 2023 14:31:28 +0300 Subject: [PATCH] virtio/vsock: fix header length on skb merging This fixes appending newly arrived skbuff to the last skbuff of the socket's queue. Problem fires when we are trying to append data to skbuff which was already processed in dequeue callback at least once. Dequeue callback calls function 'skb_pull()' which changes 'skb->len'. In current implementation 'skb->len' is used to update length in header of the last skbuff after new data was copied to it. This is bug, because value in header is used to calculate 'rx_bytes'/'fwd_cnt' and thus must be not be changed during skbuff's lifetime. Bug starts to fire since: commit 077706165717 ("virtio/vsock: don't use skbuff state to account credit") It presents before, but didn't triggered due to a little bit buggy implementation of credit calculation logic. So use Fixes tag for it. Fixes: 077706165717 ("virtio/vsock: don't use skbuff state to account credit") Signed-off-by: Arseniy Krasnov Reviewed-by: Stefano Garzarella Signed-off-by: Paolo Abeni --- 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 6564192..11ca9b3 100644 --- a/net/vmw_vsock/virtio_transport_common.c +++ b/net/vmw_vsock/virtio_transport_common.c @@ -1068,7 +1068,7 @@ virtio_transport_recv_enqueue(struct vsock_sock *vsk, memcpy(skb_put(last_skb, skb->len), skb->data, skb->len); free_pkt = true; last_hdr->flags |= hdr->flags; - last_hdr->len = cpu_to_le32(last_skb->len); + le32_add_cpu(&last_hdr->len, len); goto out; } } -- 2.7.4