4.14-stable review patch. If anyone has any objections, please let me know.
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From: Xin Long lucien.xin@gmail.com
[ Upstream commit 52a395896a051a3d5c34fba67c324f69ec5e67c6 ]
When doing asoc reset, if the sender of the response has already sent some chunk and increased asoc->next_tsn before the duplicate request comes, the response will use the old result with an incorrect sender next_tsn.
Better than asoc->next_tsn, asoc->ctsn_ack_point can't be changed after the sender of the response has performed the asoc reset and before the peer has confirmed it, and it's value is still asoc->next_tsn original value minus 1.
This patch sets sender next_tsn for the old result with ctsn_ack_point plus 1 when processing the duplicate request, to make sure the sender next_tsn value peer gets will be always right.
Fixes: 692787cef651 ("sctp: implement receiver-side procedures for the SSN/TSN Reset Request Parameter") Signed-off-by: Xin Long lucien.xin@gmail.com Acked-by: Marcelo Ricardo Leitner marcelo.leitner@gmail.com Signed-off-by: David S. Miller davem@davemloft.net Signed-off-by: Sasha Levin alexander.levin@verizon.com Signed-off-by: Greg Kroah-Hartman gregkh@linuxfoundation.org --- net/sctp/stream.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-)
--- a/net/sctp/stream.c +++ b/net/sctp/stream.c @@ -541,7 +541,7 @@ struct sctp_chunk *sctp_process_strreset i = asoc->strreset_inseq - request_seq - 1; result = asoc->strreset_result[i]; if (result == SCTP_STRRESET_PERFORMED) { - next_tsn = asoc->next_tsn; + next_tsn = asoc->ctsn_ack_point + 1; init_tsn = sctp_tsnmap_get_ctsn(&asoc->peer.tsn_map) + 1; }