From owner-svn-src-stable-12@freebsd.org Mon Aug 24 09:00:07 2020 Return-Path: Delivered-To: svn-src-stable-12@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 D4A003B6B0E; Mon, 24 Aug 2020 09:00:07 +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 4BZmKg5Lkhz4QYh; Mon, 24 Aug 2020 09:00:07 +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 9B06D16060; Mon, 24 Aug 2020 09:00:07 +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 07O907di091070; Mon, 24 Aug 2020 09:00:07 GMT (envelope-from tuexen@FreeBSD.org) Received: (from tuexen@localhost) by repo.freebsd.org (8.15.2/8.15.2/Submit) id 07O907e3091069; Mon, 24 Aug 2020 09:00:07 GMT (envelope-from tuexen@FreeBSD.org) Message-Id: <202008240900.07O907e3091069@repo.freebsd.org> X-Authentication-Warning: repo.freebsd.org: tuexen set sender to tuexen@FreeBSD.org using -f From: Michael Tuexen Date: Mon, 24 Aug 2020 09:00:07 +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: r364636 - 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: 364636 X-SVN-Commit-Repository: base MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit X-BeenThere: svn-src-stable-12@freebsd.org X-Mailman-Version: 2.1.33 Precedence: list List-Id: SVN commit messages for only the 12-stable src tree List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Mon, 24 Aug 2020 09:00:07 -0000 Author: tuexen Date: Mon Aug 24 09:00:07 2020 New Revision: 364636 URL: https://svnweb.freebsd.org/changeset/base/364636 Log: MFC r363076: Fix a use-after-free bug for the userland stack. The kernel stack is not affected. Thanks to Mark Wodrich from Google for finding and reporting the bug. Modified: stable/12/sys/netinet/sctp_indata.c Directory Properties: stable/12/ (props changed) Modified: stable/12/sys/netinet/sctp_indata.c ============================================================================== --- stable/12/sys/netinet/sctp_indata.c Mon Aug 24 08:58:45 2020 (r364635) +++ stable/12/sys/netinet/sctp_indata.c Mon Aug 24 09:00:07 2020 (r364636) @@ -1700,6 +1700,7 @@ sctp_process_a_data_chunk(struct sctp_tcb *stcb, struc int *break_flag, int last_chunk, uint8_t chk_type) { struct sctp_tmit_chunk *chk = NULL; /* make gcc happy */ + struct sctp_stream_in *strm; uint32_t tsn, fsn, gap, mid; struct mbuf *dmbuf; int the_len; @@ -2327,12 +2328,13 @@ finish_express_del: /* All can be removed */ TAILQ_FOREACH_SAFE(control, &asoc->pending_reply_queue, next, ncontrol) { TAILQ_REMOVE(&asoc->pending_reply_queue, control, next); + strm = &asoc->strmin[control->sinfo_stream]; sctp_queue_data_to_stream(stcb, asoc, control, abort_flag, &need_reasm_check); if (*abort_flag) { return (0); } if (need_reasm_check) { - (void)sctp_deliver_reasm_check(stcb, asoc, &asoc->strmin[control->sinfo_stream], SCTP_READ_LOCK_NOT_HELD); + (void)sctp_deliver_reasm_check(stcb, asoc, strm, SCTP_READ_LOCK_NOT_HELD); need_reasm_check = 0; } } @@ -2347,12 +2349,13 @@ finish_express_del: * control->sinfo_tsn > liste->tsn */ TAILQ_REMOVE(&asoc->pending_reply_queue, control, next); + strm = &asoc->strmin[control->sinfo_stream]; sctp_queue_data_to_stream(stcb, asoc, control, abort_flag, &need_reasm_check); if (*abort_flag) { return (0); } if (need_reasm_check) { - (void)sctp_deliver_reasm_check(stcb, asoc, &asoc->strmin[control->sinfo_stream], SCTP_READ_LOCK_NOT_HELD); + (void)sctp_deliver_reasm_check(stcb, asoc, strm, SCTP_READ_LOCK_NOT_HELD); need_reasm_check = 0; } }