From owner-dev-commits-src-branches@freebsd.org Tue Mar 2 12:56:40 2021 Return-Path: Delivered-To: dev-commits-src-branches@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 09463568B4D; Tue, 2 Mar 2021 12:56:40 +0000 (UTC) (envelope-from git@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 "R3" (verified OK)) by mx1.freebsd.org (Postfix) with ESMTPS id 4DqcZv6pPPz3rS8; Tue, 2 Mar 2021 12:56:39 +0000 (UTC) (envelope-from git@FreeBSD.org) Received: from gitrepo.freebsd.org (gitrepo.freebsd.org [IPv6:2610:1c1:1:6068::e6a:5]) (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 did not present a certificate) by mxrelay.nyi.freebsd.org (Postfix) with ESMTPS id DC99716FD4; Tue, 2 Mar 2021 12:56:39 +0000 (UTC) (envelope-from git@FreeBSD.org) Received: from gitrepo.freebsd.org ([127.0.1.44]) by gitrepo.freebsd.org (8.16.1/8.16.1) with ESMTP id 122CudtX052141; Tue, 2 Mar 2021 12:56:39 GMT (envelope-from git@gitrepo.freebsd.org) Received: (from git@localhost) by gitrepo.freebsd.org (8.16.1/8.16.1/Submit) id 122Cudnr052140; Tue, 2 Mar 2021 12:56:39 GMT (envelope-from git) Date: Tue, 2 Mar 2021 12:56:39 GMT Message-Id: <202103021256.122Cudnr052140@gitrepo.freebsd.org> To: src-committers@FreeBSD.org, dev-commits-src-all@FreeBSD.org, dev-commits-src-branches@FreeBSD.org From: Michael Tuexen Subject: git: f7c20120c19b - stable/13 - sctp: avoid integer overflow when starting the HB timer MIME-Version: 1.0 Content-Type: text/plain; charset=utf-8 Content-Transfer-Encoding: 8bit X-Git-Committer: tuexen X-Git-Repository: src X-Git-Refname: refs/heads/stable/13 X-Git-Reftype: branch X-Git-Commit: f7c20120c19b6307536908a7f779be2832b133f3 Auto-Submitted: auto-generated X-BeenThere: dev-commits-src-branches@freebsd.org X-Mailman-Version: 2.1.34 Precedence: list List-Id: Commits to the stable branches of the FreeBSD src repository List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Tue, 02 Mar 2021 12:56:40 -0000 The branch stable/13 has been updated by tuexen: URL: https://cgit.FreeBSD.org/src/commit/?id=f7c20120c19b6307536908a7f779be2832b133f3 commit f7c20120c19b6307536908a7f779be2832b133f3 Author: Michael Tuexen AuthorDate: 2021-02-27 22:27:30 +0000 Commit: Michael Tuexen CommitDate: 2021-03-02 12:33:01 +0000 sctp: avoid integer overflow when starting the HB timer MFC after: 3 days Reported by: syzbot+14b9d7c3c64208fae62f@syzkaller.appspotmail.com (cherry picked from commit 70e95f0b6917a8b8cd4a2a5f883f3e9753fc86d8) --- sys/netinet/sctputil.c | 13 +++++++++---- 1 file changed, 9 insertions(+), 4 deletions(-) diff --git a/sys/netinet/sctputil.c b/sys/netinet/sctputil.c index 319344842d5f..7ddb4c3710df 100644 --- a/sys/netinet/sctputil.c +++ b/sys/netinet/sctputil.c @@ -2277,14 +2277,19 @@ sctp_timer_start(int t_type, struct sctp_inpcb *inp, struct sctp_tcb *stcb, } rndval = sctp_select_initial_TSN(&inp->sctp_ep); jitter = rndval % to_ticks; - if (jitter >= (to_ticks >> 1)) { - to_ticks = to_ticks + (jitter - (to_ticks >> 1)); + to_ticks >>= 1; + if (jitter < (UINT32_MAX - to_ticks)) { + to_ticks += jitter; } else { - to_ticks = to_ticks - jitter; + to_ticks = UINT32_MAX; } if (!(net->dest_state & SCTP_ADDR_UNCONFIRMED) && !(net->dest_state & SCTP_ADDR_PF)) { - to_ticks += net->heart_beat_delay; + if (net->heart_beat_delay < (UINT32_MAX - to_ticks)) { + to_ticks += net->heart_beat_delay; + } else { + to_ticks = UINT32_MAX; + } } /* * Now we must convert the to_ticks that are now in ms to