Date: Sun, 23 Aug 2020 22:54:30 +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-12@freebsd.org Subject: svn commit: r364585 - stable/12/sys/netinet Message-ID: <202008232254.07NMsUoF017754@repo.freebsd.org>
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Author: tuexen Date: Sun Aug 23 22:54:30 2020 New Revision: 364585 URL: https://svnweb.freebsd.org/changeset/base/364585 Log: MFC r361116: Ensure that an stcb is not dereferenced when it is about to be freed. This issue was found by SYZKALLER. Modified: stable/12/sys/netinet/sctp_indata.c stable/12/sys/netinet/sctp_indata.h Directory Properties: stable/12/ (props changed) Modified: stable/12/sys/netinet/sctp_indata.c ============================================================================== --- stable/12/sys/netinet/sctp_indata.c Sun Aug 23 22:52:47 2020 (r364584) +++ stable/12/sys/netinet/sctp_indata.c Sun Aug 23 22:54:30 2020 (r364585) @@ -164,6 +164,9 @@ sctp_build_readq_entry(struct sctp_tcb *stcb, read_queue_e->data = dm; read_queue_e->stcb = stcb; read_queue_e->port_from = stcb->rport; + if (stcb->asoc.state & SCTP_STATE_ABOUT_TO_BE_FREED) { + read_queue_e->do_not_ref_stcb = 1; + } failed_build: return (read_queue_e); } @@ -775,6 +778,7 @@ sctp_build_readq_entry_from_ctl(struct sctp_queued_to_ atomic_add_int(&nc->whoFrom->ref_count, 1); nc->stcb = control->stcb; nc->port_from = control->port_from; + nc->do_not_ref_stcb = control->do_not_ref_stcb; } static void Modified: stable/12/sys/netinet/sctp_indata.h ============================================================================== --- stable/12/sys/netinet/sctp_indata.h Sun Aug 23 22:52:47 2020 (r364584) +++ stable/12/sys/netinet/sctp_indata.h Sun Aug 23 22:54:30 2020 (r364585) @@ -68,6 +68,9 @@ sctp_build_readq_entry(struct sctp_tcb *stcb, (_ctl)->data = dm; \ (_ctl)->stcb = (in_it); \ (_ctl)->port_from = (in_it)->rport; \ + if ((in_it)->asoc.state & SCTP_STATE_ABOUT_TO_BE_FREED) { \ + (_ctl)->do_not_ref_stcb = 1; \ + }\ } \ } while (0)
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