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author | Pengcheng Yang <yangpc@wangsu.com> | 2019-12-30 17:54:41 +0800 |
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committer | David S. Miller <davem@davemloft.net> | 2020-01-02 15:42:28 -0800 |
commit | c9655008e7845bcfdaac10a1ed8554ec167aea88 (patch) | |
tree | 47f88a850061d17b1635abe37ab0d17238a479a5 /Documentation | |
parent | f7a48b68abd9b20ce1ac6298aaaa3c4d158271dd (diff) | |
download | linux-c9655008e7845bcfdaac10a1ed8554ec167aea88.tar.gz |
tcp: fix "old stuff" D-SACK causing SACK to be treated as D-SACK
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>
Diffstat (limited to 'Documentation')
0 files changed, 0 insertions, 0 deletions