Date: Tue, 16 Sep 2014 09:48:24 +0000 (UTC) From: Xin LI <delphij@FreeBSD.org> To: src-committers@freebsd.org, svn-src-all@freebsd.org, svn-src-head@freebsd.org Subject: svn commit: r271666 - head/sys/netinet Message-ID: <201409160948.s8G9mOKG062738@svn.freebsd.org>
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Author: delphij Date: Tue Sep 16 09:48:24 2014 New Revision: 271666 URL: http://svnweb.freebsd.org/changeset/base/271666 Log: Fix Denial of Service in TCP packet processing. Submitted by: glebius Security: FreeBSD-SA-14:19.tcp Modified: head/sys/netinet/tcp_input.c Modified: head/sys/netinet/tcp_input.c ============================================================================== --- head/sys/netinet/tcp_input.c Tue Sep 16 09:22:43 2014 (r271665) +++ head/sys/netinet/tcp_input.c Tue Sep 16 09:48:24 2014 (r271666) @@ -2185,11 +2185,7 @@ 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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