| Message ID | a0a956bbb2142d8de933d20a7a01e8ce66d048c0.1626883705.git.lucien.xin@gmail.com |
|---|---|
| State | New |
| Headers | show |
| Series | [net] sctp: do not update transport pathmtu if SPP_PMTUD_ENABLE is not set | expand |
diff --git a/net/sctp/output.c b/net/sctp/output.c index 9032ce60d50e..8d5708dd2a1f 100644 --- a/net/sctp/output.c +++ b/net/sctp/output.c @@ -104,8 +104,8 @@ void sctp_packet_config(struct sctp_packet *packet, __u32 vtag, if (asoc->param_flags & SPP_PMTUD_ENABLE) sctp_assoc_sync_pmtu(asoc); } else if (!sctp_transport_pl_enabled(tp) && - !sctp_transport_pmtu_check(tp)) { - if (asoc->param_flags & SPP_PMTUD_ENABLE) + asoc->param_flags & SPP_PMTUD_ENABLE) + if (!sctp_transport_pmtu_check(tp)) sctp_assoc_sync_pmtu(asoc); }
Currently, in sctp_packet_config(), sctp_transport_pmtu_check() is called to update transport pathmtu with dst's mtu when dst's mtu has been changed by non sctp stack like xfrm. However, this should only happen when SPP_PMTUD_ENABLE is set, no matter where dst's mtu changed. This patch is to fix by checking SPP_PMTUD_ENABLE flag before calling sctp_transport_pmtu_check(). Thanks Jacek for reporting and looking into this issue. Fixes: 69fec325a643 ('Revert "sctp: remove sctp_transport_pmtu_check"') Reported-by: Jacek Szafraniec <jacek.szafraniec@nokia.com> Tested-by: Jacek Szafraniec <jacek.szafraniec@nokia.com> Signed-off-by: Xin Long <lucien.xin@gmail.com> --- net/sctp/output.c | 4 ++-- 1 file changed, 2 insertions(+), 2 deletions(-)