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.
Index: ip_input.c
===================================================================
RCS file: /cvs/src/sys/netinet/ip_input.c,v
retrieving revision 1.31
retrieving revision 1.32
diff -u -r1.31 -r1.32
--- ip_input.c 1998/05/18 21:10:49 1.31
+++ ip_input.c 1998/11/13 22:24:17 1.32
@@ -1,4 +1,4 @@
-/* $OpenBSD: ip_input.c,v 1.31 1998/05/18 21:10:49 provos 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);
