Date: Sat, 16 May 2020 19:26:39 +0000 (UTC) From: Michael Tuexen <tuexen@FreeBSD.org> To: src-committers@freebsd.org, svn-src-all@freebsd.org, svn-src-head@freebsd.org Subject: svn commit: r361116 - head/sys/netinet Message-ID: <202005161926.04GJQdav040843@repo.freebsd.org>
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Author: tuexen Date: Sat May 16 19:26:39 2020 New Revision: 361116 URL: https://svnweb.freebsd.org/changeset/base/361116 Log: Ensure that an stcb is not dereferenced when it is about to be freed. This issue was found by SYZKALLER. MFC after: 3 days Modified: head/sys/netinet/sctp_indata.c head/sys/netinet/sctp_indata.h Modified: head/sys/netinet/sctp_indata.c ============================================================================== --- head/sys/netinet/sctp_indata.c Sat May 16 18:49:37 2020 (r361115) +++ head/sys/netinet/sctp_indata.c Sat May 16 19:26:39 2020 (r361116) @@ -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: head/sys/netinet/sctp_indata.h ============================================================================== --- head/sys/netinet/sctp_indata.h Sat May 16 18:49:37 2020 (r361115) +++ head/sys/netinet/sctp_indata.h Sat May 16 19:26:39 2020 (r361116) @@ -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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