Date: Sun, 6 Jun 2021 23:41:12 GMT From: Michael Tuexen <tuexen@FreeBSD.org> To: src-committers@FreeBSD.org, dev-commits-src-all@FreeBSD.org, dev-commits-src-branches@FreeBSD.org Subject: git: 405bee30bc93 - stable/13 - sctp: improve restart handling Message-ID: <202106062341.156NfC5Z090163@gitrepo.freebsd.org>
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The branch stable/13 has been updated by tuexen: URL: https://cgit.FreeBSD.org/src/commit/?id=405bee30bc938e6c55a10ab68818573aca2de209 commit 405bee30bc938e6c55a10ab68818573aca2de209 Author: Michael Tuexen <tuexen@FreeBSD.org> AuthorDate: 2021-05-03 00:20:24 +0000 Commit: Michael Tuexen <tuexen@FreeBSD.org> CommitDate: 2021-06-02 21:52:39 +0000 sctp: improve restart handling This fixes in particular a possible use after free bug reported Anatoly Korniltsev and Taylor Brandstetter for the userland stack. (cherry picked from commit a89481d328fd96ccbfa642e1db6d03825fa1dc6d) --- sys/netinet/sctp_input.c | 20 ++++++++++++-------- 1 file changed, 12 insertions(+), 8 deletions(-) diff --git a/sys/netinet/sctp_input.c b/sys/netinet/sctp_input.c index 10e1c37c6cfb..b6fe6449bc21 100644 --- a/sys/netinet/sctp_input.c +++ b/sys/netinet/sctp_input.c @@ -1761,11 +1761,7 @@ sctp_process_cookie_existing(struct mbuf *m, int iphlen, int offset, /* temp code */ if (how_indx < sizeof(asoc->cookie_how)) asoc->cookie_how[how_indx] = 12; - sctp_timer_stop(SCTP_TIMER_TYPE_INIT, inp, stcb, net, - SCTP_FROM_SCTP_INPUT + SCTP_LOC_16); - sctp_timer_stop(SCTP_TIMER_TYPE_HEARTBEAT, inp, stcb, net, - SCTP_FROM_SCTP_INPUT + SCTP_LOC_17); - + sctp_stop_association_timers(stcb, false); /* notify upper layer */ *notification = SCTP_NOTIFY_ASSOC_RESTART; atomic_add_int(&stcb->asoc.refcnt, 1); @@ -1798,6 +1794,10 @@ sctp_process_cookie_existing(struct mbuf *m, int iphlen, int offset, asoc->str_reset_seq_in = asoc->init_seq_number; asoc->advanced_peer_ack_point = asoc->last_acked_seq; asoc->send_sack = 1; + asoc->data_pkts_seen = 0; + asoc->last_data_chunk_from = NULL; + asoc->last_control_chunk_from = NULL; + asoc->last_net_cmt_send_started = NULL; if (asoc->mapping_array) { memset(asoc->mapping_array, 0, asoc->mapping_array_size); @@ -1858,6 +1858,9 @@ sctp_process_cookie_existing(struct mbuf *m, int iphlen, int offset, SCTP_ZONE_FREE(SCTP_BASE_INFO(ipi_zone_chunk), chk); SCTP_DECR_CHK_COUNT(); } + asoc->ctrl_queue_cnt = 0; + asoc->str_reset = NULL; + asoc->stream_reset_outstanding = 0; TAILQ_FOREACH_SAFE(chk, &asoc->asconf_send_queue, sctp_next, nchk) { TAILQ_REMOVE(&asoc->asconf_send_queue, chk, sctp_next); if (chk->data) { @@ -1937,12 +1940,13 @@ sctp_process_cookie_existing(struct mbuf *m, int iphlen, int offset, return (NULL); } /* respond with a COOKIE-ACK */ - sctp_stop_all_cookie_timers(stcb); - sctp_toss_old_cookies(stcb, asoc); sctp_send_cookie_ack(stcb); if (how_indx < sizeof(asoc->cookie_how)) asoc->cookie_how[how_indx] = 15; - + if (sctp_is_feature_on(inp, SCTP_PCB_FLAGS_AUTOCLOSE) && + (asoc->sctp_autoclose_ticks > 0)) { + sctp_timer_start(SCTP_TIMER_TYPE_AUTOCLOSE, inp, stcb, NULL); + } return (stcb); } if (how_indx < sizeof(asoc->cookie_how))
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