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Pengcheng Yang 5ea5b6e3c6 tcp: fix "old stuff" D-SACK causing SACK to be treated as D-SACK 
[ Upstream commit c9655008e7845bcfdaac10a1ed8554ec167aea88 ]

When we receive a D-SACK, where the sequence number satisfies:
	undo_marker <= start_seq < end_seq <= prior_snd_una
we consider this is a valid D-SACK and tcp_is_sackblock_valid()
returns true, then this D-SACK is discarded as "old stuff",
but the variable first_sack_index is not marked as negative
in tcp_sacktag_write_queue().

If this D-SACK also carries a SACK that needs to be processed
(for example, the previous SACK segment was lost), this SACK
will be treated as a D-SACK in the following processing of
tcp_sacktag_write_queue(), which will eventually lead to
incorrect updates of undo_retrans and reordering.

Fixes: fd6dad616d ("[TCP]: Earlier SACK block verification & simplify access to them")
Signed-off-by: Pengcheng Yang <yangpc@wangsu.com>
Signed-off-by: Eric Dumazet <edumazet@google.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
2020-01-12 12:17:27 +01:00
..
bpfilter
netfilter netfilter: masquerade: don't flush all conntracks if only one address deleted on device 2019-11-20 18:47:52 +01:00
af_inet.c gso_segment: Reset skb->mac_len after modifying network header 2018-09-13 12:09:32 -07:00
ah4.c
arp.c
cipso_ipv4.c net: avoid use IPCB in cipso_v4_error 2019-03-10 07:17:19 +01:00
datagram.c inet: stop leaking jiffies on the wire 2019-11-10 11:27:37 +01:00
devinet.c inet: protect against too small mtu values. 2019-12-21 10:57:08 +01:00
esp4.c esp4: add length check for UDP encapsulation 2019-05-25 18:23:41 +02:00
esp4_offload.c
fib_frontend.c ipv4: fix route update on metric change. 2019-11-10 11:27:50 +01:00
fib_lookup.h
fib_notifier.c
fib_rules.c
fib_semantics.c ipv4: Fix table id reference in fib_sync_down_addr 2019-11-12 19:20:27 +01:00
fib_trie.c net: ipv4: Fix memory leak in network namespace dismantle 2019-01-31 08:14:32 +01:00
fou.c net: fou: do not use guehdr after iptunnel_pull_offloads in gue_udp_recv 2019-04-27 09:36:31 +02:00
gre_demux.c gre: refetch erspan header from skb->data after pskb_may_pull() 2019-12-17 20:35:51 +01:00
gre_offload.c
icmp.c net: icmp: fix data-race in cmp_global_allow() 2020-01-04 19:13:30 +01:00
igmp.c ipv4/igmp: fix v1/v2 switchback timeout based on rfc3376, 8.12 2019-12-01 09:17:05 +01:00
inet_connection_sock.c net: add bool confirm_neigh parameter for dst_ops.update_pmtu 2020-01-04 19:13:37 +01:00
inet_diag.c tcp/dccp: fix possible race __inet_lookup_established() 2020-01-04 19:13:41 +01:00
inet_fragment.c net: IP defrag: encapsulate rbtree defrag code into callable functions 2019-04-27 09:36:33 +02:00
inet_hashtables.c tcp/dccp: fix possible race __inet_lookup_established() 2020-01-04 19:13:41 +01:00
inet_timewait_sock.c
inetpeer.c inetpeer: fix data-race in inet_putpeer / inet_putpeer 2020-01-04 19:13:29 +01:00
ip_forward.c net: clear skb->tstamp in forwarding paths 2019-01-09 17:38:31 +01:00
ip_fragment.c net: IP defrag: encapsulate rbtree defrag code into callable functions 2019-04-27 09:36:33 +02:00
ip_gre.c net: ip_gre: do not report erspan_ver for gre or gretap 2019-12-05 09:21:10 +01:00
ip_input.c vrf: check accept_source_route on the original netdevice 2019-04-17 08:38:42 +02:00
ip_options.c vrf: check accept_source_route on the original netdevice 2019-04-17 08:38:42 +02:00
ip_output.c inet: protect against too small mtu values. 2019-12-21 10:57:08 +01:00
ip_sockglue.c net: bpfilter: fix iptables failure if bpfilter_umh is disabled 2019-12-01 09:17:18 +01:00
ip_tunnel.c tunnel: do not confirm neighbor when do pmtu update 2020-01-04 19:13:38 +01:00
ip_tunnel_core.c ip_tunnel: allow not to count pkts on tstats by setting skb's dev to NULL 2019-08-04 09:30:57 +02:00
ip_vti.c vti: do not confirm neighbor when do pmtu update 2020-01-04 19:13:39 +01:00
ipcomp.c
ipconfig.c
ipip.c ipip: validate header length in ipip_tunnel_xmit 2019-08-09 17:52:30 +02:00
ipmr.c ipmr: Fix skb headroom in ipmr_get_route(). 2019-11-20 18:45:11 +01:00
ipmr_base.c net: ipmr: fix unresolved entry dumps 2018-10-17 22:35:42 -07:00
Kconfig
Makefile
metrics.c
netfilter.c
netlink.c ipv4: Add ICMPv6 support when parse route ipproto 2019-03-10 07:17:17 +01:00
ping.c
proc.c tcp: tcp_fragment() should apply sane memory limits 2019-06-17 19:51:56 +02:00
protocol.c
raw.c ipv4: Use return value of inet_iif() for __raw_v4_lookup in the while loop 2019-07-03 13:14:46 +02:00
raw_diag.c net: don't warn in inet diag when IPV6 is disabled 2019-10-01 08:26:11 +02:00
route.c net: add bool confirm_neigh parameter for dst_ops.update_pmtu 2020-01-04 19:13:37 +01:00
syncookies.c tcp: handle inet_csk_reqsk_queue_add() failures 2019-03-19 13:12:39 +01:00
sysctl_net_ipv4.c tcp: add tcp_min_snd_mss sysctl 2019-06-17 19:51:56 +02:00
tcp.c tcp: annotate tp->rcv_nxt lockless reads 2020-01-09 10:19:08 +01:00
tcp_bbr.c tcp_bbr: apply PROBE_RTT cwnd cap even if acked==0 2018-08-22 21:45:32 -07:00
tcp_bic.c
tcp_cdg.c
tcp_cong.c tcp: fix tcp_set_congestion_control() use from bpf hook 2019-07-28 08:29:26 +02:00
tcp_cubic.c
tcp_dctcp.c tcp: Ensure DCTCP reacts to losses 2019-04-17 08:38:41 +02:00
tcp_diag.c tcp: annotate tp->rcv_nxt lockless reads 2020-01-09 10:19:08 +01:00
tcp_fastopen.c
tcp_highspeed.c
tcp_htcp.c
tcp_hybla.c
tcp_illinois.c
tcp_input.c tcp: fix "old stuff" D-SACK causing SACK to be treated as D-SACK 2020-01-12 12:17:27 +01:00
tcp_ipv4.c tcp: annotate tp->rcv_nxt lockless reads 2020-01-09 10:19:08 +01:00
tcp_lp.c
tcp_metrics.c
tcp_minisocks.c tcp: annotate tp->rcv_nxt lockless reads 2020-01-09 10:19:08 +01:00
tcp_nv.c
tcp_offload.c
tcp_output.c tcp: do not send empty skb from tcp_write_xmit() 2020-01-04 19:13:42 +01:00
tcp_rate.c
tcp_recovery.c tcp: add stat of data packet reordering events 2018-08-01 09:56:10 -07:00
tcp_scalable.c
tcp_timer.c tcp: fix SNMP TCP timeout under-estimation 2019-12-13 08:52:20 +01:00
tcp_ulp.c tcp, ulp: fix leftover icsk_ulp_ops preventing sock from reattach 2018-08-16 14:58:08 -07:00
tcp_vegas.c
tcp_vegas.h
tcp_veno.c
tcp_westwood.c
tcp_yeah.c
tunnel4.c
udp.c udp: fix integer overflow while computing available space in sk_rcvbuf 2020-01-04 19:13:36 +01:00
udp_diag.c
udp_impl.h
udp_offload.c
udp_tunnel.c
udplite.c
xfrm4_input.c xfrm: reset transport header back to network header after all input transforms ahave been applied 2018-09-04 10:26:30 +02:00
xfrm4_mode_beet.c
xfrm4_mode_transport.c xfrm: reset transport header back to network header after all input transforms ahave been applied 2018-09-04 10:26:30 +02:00
xfrm4_mode_tunnel.c
xfrm4_output.c
xfrm4_policy.c net: add bool confirm_neigh parameter for dst_ops.update_pmtu 2020-01-04 19:13:37 +01:00
xfrm4_protocol.c
xfrm4_state.c
xfrm4_tunnel.c