]> git.proxmox.com Git - mirror_ubuntu-kernels.git/commitdiff
tcp: fix "old stuff" D-SACK causing SACK to be treated as D-SACK
authorPengcheng Yang <yangpc@wangsu.com>
Mon, 30 Dec 2019 09:54:41 +0000 (17:54 +0800)
committerDavid S. Miller <davem@davemloft.net>
Thu, 2 Jan 2020 23:42:28 +0000 (15:42 -0800)
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: fd6dad616d4f ("[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>
net/ipv4/tcp_input.c

index 88b987ca9ebbbbf0f28ea4560e3731837aea7fb3..0238b554a1f008e7d2091359ad2f19929dfaf074 100644 (file)
@@ -1727,8 +1727,11 @@ tcp_sacktag_write_queue(struct sock *sk, const struct sk_buff *ack_skb,
                }
 
                /* Ignore very old stuff early */
-               if (!after(sp[used_sacks].end_seq, prior_snd_una))
+               if (!after(sp[used_sacks].end_seq, prior_snd_una)) {
+                       if (i == 0)
+                               first_sack_index = -1;
                        continue;
+               }
 
                used_sacks++;
        }