From owner-svn-src-stable-12@freebsd.org Sun Aug 23 22:40:39 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 601613CE316; Sun, 23 Aug 2020 22:40:39 +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 4BZVZv1zqVz3SDF; Sun, 23 Aug 2020 22:40:39 +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 278AFE6C0; Sun, 23 Aug 2020 22:40:39 +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 07NMedai005756; Sun, 23 Aug 2020 22:40:39 GMT (envelope-from tuexen@FreeBSD.org) Received: (from tuexen@localhost) by repo.freebsd.org (8.15.2/8.15.2/Submit) id 07NMedeb005755; Sun, 23 Aug 2020 22:40:39 GMT (envelope-from tuexen@FreeBSD.org) Message-Id: <202008232240.07NMedeb005755@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 22:40:39 +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: r364580 - 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: 364580 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: Sun, 23 Aug 2020 22:40:39 -0000 Author: tuexen Date: Sun Aug 23 22:40:38 2020 New Revision: 364580 URL: https://svnweb.freebsd.org/changeset/base/364580 Log: MFC r360671: Avoid underflowing a variable, which would result in taking more data from the stream queues then needed. Thanks to Timo Voelker for finding this bug and providing a fix. Modified: stable/12/sys/netinet/sctp_output.c Directory Properties: stable/12/ (props changed) Modified: stable/12/sys/netinet/sctp_output.c ============================================================================== --- stable/12/sys/netinet/sctp_output.c Sun Aug 23 22:39:06 2020 (r364579) +++ stable/12/sys/netinet/sctp_output.c Sun Aug 23 22:40:38 2020 (r364580) @@ -7769,7 +7769,11 @@ sctp_fill_outqueue(struct sctp_tcb *stcb, } strq = stcb->asoc.ss_functions.sctp_ss_select_stream(stcb, net, asoc); total_moved += moved; - space_left -= moved; + if (space_left >= moved) { + space_left -= moved; + } else { + space_left = 0; + } if (space_left >= SCTP_DATA_CHUNK_OVERHEAD(stcb)) { space_left -= SCTP_DATA_CHUNK_OVERHEAD(stcb); } else {