Author: tuexen
Date: Sun Dec 13 23:51:51 2020
New Revision: 368622
URL: https://svnweb.freebsd.org/changeset/base/368622
Log:
Harden the handling of outgoing streams in case of an restart or INIT
collision. This avouds an out-of-bounce access in case the peer can
break the cookie signature. Thanks to Felix Wilhelm from Google for
reporting the issue.
MFC after: 1 week
Modified:
head/sys/netinet/sctp_input.c
Modified: head/sys/netinet/sctp_input.c
==============================================================================
--- head/sys/netinet/sctp_input.c Sun Dec 13 23:32:50 2020
(r368621)
+++ head/sys/netinet/sctp_input.c Sun Dec 13 23:51:51 2020
(r368622)
@@ -1699,7 +1699,9 @@ sctp_process_cookie_existing(struct mbuf *m, int iphle
NULL);
}
asoc->my_rwnd = ntohl(initack_cp->init.a_rwnd);
- asoc->pre_open_streams =
ntohs(initack_cp->init.num_outbound_streams);
+ if (asoc->pre_open_streams < asoc->streamoutcnt) {
+ asoc->pre_open_streams = asoc->streamoutcnt;
+ }
if (ntohl(init_cp->init.initiate_tag) != asoc->peer_vtag) {
/*
@@ -1831,7 +1833,9 @@ sctp_process_cookie_existing(struct mbuf *m, int iphle
/* move to OPEN state, if not in SHUTDOWN_SENT */
SCTP_SET_STATE(stcb, SCTP_STATE_OPEN);
}
- asoc->pre_open_streams =
ntohs(initack_cp->init.num_outbound_streams);
+ if (asoc->pre_open_streams < asoc->streamoutcnt) {
+ asoc->pre_open_streams = asoc->streamoutcnt;
+ }
asoc->init_seq_number = ntohl(initack_cp->init.initial_tsn);
asoc->sending_seq = asoc->asconf_seq_out =
asoc->str_reset_seq_out = asoc->init_seq_number;
asoc->asconf_seq_out_acked = asoc->asconf_seq_out - 1;
@@ -2108,7 +2112,6 @@ sctp_process_cookie_new(struct mbuf *m, int iphlen, in
/* process the INIT-ACK info (my info) */
asoc->my_vtag = ntohl(initack_cp->init.initiate_tag);
asoc->my_rwnd = ntohl(initack_cp->init.a_rwnd);
- asoc->pre_open_streams = ntohs(initack_cp->init.num_outbound_streams);
asoc->init_seq_number = ntohl(initack_cp->init.initial_tsn);
asoc->sending_seq = asoc->asconf_seq_out = asoc->str_reset_seq_out =
asoc->init_seq_number;
asoc->asconf_seq_out_acked = asoc->asconf_seq_out - 1;
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