From owner-svn-src-all@freebsd.org Sun Aug 23 22:54:30 2020 Return-Path: Delivered-To: svn-src-all@mailman.nyi.freebsd.org Received: from mx1.freebsd.org (mx1.freebsd.org [IPv6:2610:1c1:1:606c::19:1]) by mailman.nyi.freebsd.org (Postfix) with ESMTP id DD0343CE938; Sun, 23 Aug 2020 22:54:30 +0000 (UTC) (envelope-from tuexen@FreeBSD.org) Received: from mxrelay.nyi.freebsd.org (mxrelay.nyi.freebsd.org [IPv6:2610:1c1:1:606c::19:3]) (using TLSv1.3 with cipher TLS_AES_256_GCM_SHA384 (256/256 bits) key-exchange X25519 server-signature RSA-PSS (4096 bits) server-digest SHA256 client-signature RSA-PSS (4096 bits) client-digest SHA256) (Client CN "mxrelay.nyi.freebsd.org", Issuer "Let's Encrypt Authority X3" (verified OK)) by mx1.freebsd.org (Postfix) with ESMTPS id 4BZVtt5YNTz3TGW; Sun, 23 Aug 2020 22:54:30 +0000 (UTC) (envelope-from tuexen@FreeBSD.org) Received: from repo.freebsd.org (repo.freebsd.org [IPv6:2610:1c1:1:6068::e6a:0]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (Client did not present a certificate) by mxrelay.nyi.freebsd.org (Postfix) with ESMTPS id A1EA2EBDC; Sun, 23 Aug 2020 22:54:30 +0000 (UTC) (envelope-from tuexen@FreeBSD.org) Received: from repo.freebsd.org ([127.0.1.37]) by repo.freebsd.org (8.15.2/8.15.2) with ESMTP id 07NMsUBM017758; Sun, 23 Aug 2020 22:54:30 GMT (envelope-from tuexen@FreeBSD.org) Received: (from tuexen@localhost) by repo.freebsd.org (8.15.2/8.15.2/Submit) id 07NMsUoF017754; Sun, 23 Aug 2020 22:54:30 GMT (envelope-from tuexen@FreeBSD.org) Message-Id: <202008232254.07NMsUoF017754@repo.freebsd.org> X-Authentication-Warning: repo.freebsd.org: tuexen set sender to tuexen@FreeBSD.org using -f From: Michael Tuexen Date: Sun, 23 Aug 2020 22:54:30 +0000 (UTC) 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 X-SVN-Group: stable-12 X-SVN-Commit-Author: tuexen X-SVN-Commit-Paths: stable/12/sys/netinet X-SVN-Commit-Revision: 364585 X-SVN-Commit-Repository: base MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit X-BeenThere: svn-src-all@freebsd.org X-Mailman-Version: 2.1.33 Precedence: list List-Id: "SVN commit messages for the entire src tree \(except for " user" and " projects" \)" List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Sun, 23 Aug 2020 22:54:30 -0000 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)