Date: Tue, 16 Sep 2014 09:49:12 +0000 (UTC) From: Xin LI <delphij@FreeBSD.org> To: src-committers@freebsd.org, svn-src-all@freebsd.org, svn-src-stable@freebsd.org, svn-src-stable-8@freebsd.org Subject: svn commit: r271668 - in stable: 8/sys/netinet 9/sys/netinet Message-ID: <201409160949.s8G9nC7A062948@svn.freebsd.org>
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Author: delphij Date: Tue Sep 16 09:49:11 2014 New Revision: 271668 URL: http://svnweb.freebsd.org/changeset/base/271668 Log: Fix Denial of Service in TCP packet processing. Security: FreeBSD-SA-14:19.tcp Modified: stable/8/sys/netinet/tcp_input.c Changes in other areas also in this revision: Modified: stable/9/sys/netinet/tcp_input.c Modified: stable/8/sys/netinet/tcp_input.c ============================================================================== --- stable/8/sys/netinet/tcp_input.c Tue Sep 16 09:48:35 2014 (r271667) +++ stable/8/sys/netinet/tcp_input.c Tue Sep 16 09:49:11 2014 (r271668) @@ -2092,11 +2092,7 @@ tcp_do_segment(struct mbuf *m, struct tc todrop = tp->rcv_nxt - th->th_seq; if (todrop > 0) { - /* - * If this is a duplicate SYN for our current connection, - * advance over it and pretend and it's not a SYN. - */ - if (thflags & TH_SYN && th->th_seq == tp->irs) { + if (thflags & TH_SYN) { thflags &= ~TH_SYN; th->th_seq++; if (th->th_urp > 1)
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