Date: Thu, 7 May 2020 02:10:44 +0000 (UTC) From: Michael Tuexen <tuexen@FreeBSD.org> To: src-committers@freebsd.org, svn-src-all@freebsd.org, svn-src-stable@freebsd.org, svn-src-stable-11@freebsd.org Subject: svn commit: r360744 - stable/11/sys/netinet Message-ID: <202005070210.0472AiaH081749@repo.freebsd.org>
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Author: tuexen Date: Thu May 7 02:10:44 2020 New Revision: 360744 URL: https://svnweb.freebsd.org/changeset/base/360744 Log: MFC r353123: Fix use afterfreee. Fix a use after free bug when removing remote addresses. This bug was found by OSS-Fuzz and reported in https://bugs.chromium.org/p/oss-fuzz/issues/detail?id=18004 Modified: stable/11/sys/netinet/sctp_asconf.c Directory Properties: stable/11/ (props changed) Modified: stable/11/sys/netinet/sctp_asconf.c ============================================================================== --- stable/11/sys/netinet/sctp_asconf.c Thu May 7 02:08:44 2020 (r360743) +++ stable/11/sys/netinet/sctp_asconf.c Thu May 7 02:10:44 2020 (r360744) @@ -281,7 +281,7 @@ sctp_process_asconf_add_ip(struct sockaddr *src, struc static int sctp_asconf_del_remote_addrs_except(struct sctp_tcb *stcb, struct sockaddr *src) { - struct sctp_nets *src_net, *net; + struct sctp_nets *src_net, *net, *nnet; /* make sure the source address exists as a destination net */ src_net = sctp_findnet(stcb, src); @@ -291,10 +291,9 @@ sctp_asconf_del_remote_addrs_except(struct sctp_tcb *s } /* delete all destination addresses except the source */ - TAILQ_FOREACH(net, &stcb->asoc.nets, sctp_next) { + TAILQ_FOREACH_SAFE(net, &stcb->asoc.nets, sctp_next, nnet) { if (net != src_net) { /* delete this address */ - sctp_remove_net(stcb, net); SCTPDBG(SCTP_DEBUG_ASCONF1, "asconf_del_remote_addrs_except: deleting "); SCTPDBG_ADDR(SCTP_DEBUG_ASCONF1, @@ -302,6 +301,7 @@ sctp_asconf_del_remote_addrs_except(struct sctp_tcb *s /* notify upper layer */ sctp_ulp_notify(SCTP_NOTIFY_ASCONF_DELETE_IP, stcb, 0, (struct sockaddr *)&net->ro._l_addr, SCTP_SO_NOT_LOCKED); + sctp_remove_net(stcb, net); } } return (0);
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