[PATCH 4.17 53/63] sctp: fix the issue that pathmtu may be set lower than MINSEGMENT

4.17-stable review patch. If anyone has any objections, please let me know. -- From: Xin Long [ Upstream commit a65925475571953da12a9bc2082aec29d4e2c0e7 ] After commit b6c5734db070 ("sctp: fix the handling of ICMP Frag Needed for too small MTUs"), sctp_transport_update_pmtu

[PATCH 4.17 53/63] sctp: fix the issue that pathmtu may be set lower than MINSEGMENT

4.17-stable review patch. If anyone has any objections, please let me know. -- From: Xin Long [ Upstream commit a65925475571953da12a9bc2082aec29d4e2c0e7 ] After commit b6c5734db070 ("sctp: fix the handling of ICMP Frag Needed for too small MTUs"), sctp_transport_update_pmtu