Note: this is the third version of this patch.

Apply by doing
       cd /usr/src/sys/netinet
       patch -p0 < tcpfix.patch

And then rebuild your kernel.

--- ip_input.c.orig     Fri Nov 13 15:26:49 1998
+++ ip_input.c  Fri Nov 13 15:27:04 1998
@@ -1,4 +1,4 @@
-/*     $OpenBSD: ip_input.c,v 1.30 1998/02/14 18:50:36 mickey Exp $    */
+/*     $OpenBSD: ip_input.c,v 1.32 1998/11/13 22:24:17 provos Exp $    */
/*     $NetBSD: ip_input.c,v 1.30 1996/03/16 23:53:58 christos Exp $   */

/*
@@ -388,7 +388,7 @@
        */
       if (ip->ip_off &~ (IP_DF | IP_RF)) {
               if (m->m_flags & M_EXT) {               /* XXX */
-                       if ((m = m_pullup(m, sizeof (struct ip))) == 0) {
+                       if ((m = m_pullup(m, hlen)) == 0) {
                               ipstat.ips_toosmall++;
                               goto next;
                       }
@@ -446,6 +446,7 @@
                               goto next;
                       ipstat.ips_reassembled++;
                       m = dtom(ip);
+                       hlen = ip->ip_hl << 2;
               } else
                       if (fp)
                               ip_freef(fp);

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