diff options
author | Willem de Bruijn <willemb@google.com> | 2020-03-09 18:34:35 +0300 |
---|---|---|
committer | Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2020-03-18 09:14:12 +0300 |
commit | 64fabf9bcadfb93fb21fb023a72a2ad8b7a40047 (patch) | |
tree | b321d7db35e8b4fef67b308939d0cbeef84af023 /net | |
parent | 7e78a7fdcc8d8c854e5dc8441a452baca24dec67 (diff) | |
download | linux-64fabf9bcadfb93fb21fb023a72a2ad8b7a40047.tar.xz |
net/packet: tpacket_rcv: do not increment ring index on drop
[ Upstream commit 46e4c421a053c36bf7a33dda2272481bcaf3eed3 ]
In one error case, tpacket_rcv drops packets after incrementing the
ring producer index.
If this happens, it does not update tp_status to TP_STATUS_USER and
thus the reader is stalled for an iteration of the ring, causing out
of order arrival.
The only such error path is when virtio_net_hdr_from_skb fails due
to encountering an unknown GSO type.
Signed-off-by: Willem de Bruijn <willemb@google.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Diffstat (limited to 'net')
-rw-r--r-- | net/packet/af_packet.c | 13 |
1 files changed, 7 insertions, 6 deletions
diff --git a/net/packet/af_packet.c b/net/packet/af_packet.c index ddf90e6fac51..ecea8edae61c 100644 --- a/net/packet/af_packet.c +++ b/net/packet/af_packet.c @@ -2260,6 +2260,13 @@ static int tpacket_rcv(struct sk_buff *skb, struct net_device *dev, TP_STATUS_KERNEL, (macoff+snaplen)); if (!h.raw) goto drop_n_account; + + if (do_vnet && + virtio_net_hdr_from_skb(skb, h.raw + macoff - + sizeof(struct virtio_net_hdr), + vio_le(), true, 0)) + goto drop_n_account; + if (po->tp_version <= TPACKET_V2) { packet_increment_rx_head(po, &po->rx_ring); /* @@ -2272,12 +2279,6 @@ static int tpacket_rcv(struct sk_buff *skb, struct net_device *dev, status |= TP_STATUS_LOSING; } - if (do_vnet && - virtio_net_hdr_from_skb(skb, h.raw + macoff - - sizeof(struct virtio_net_hdr), - vio_le(), true, 0)) - goto drop_n_account; - po->stats.stats1.tp_packets++; if (copy_skb) { status |= TP_STATUS_COPY; |