--- /dev/null
+Description: Fix remotely exploitable DoS. http://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2016-10396
+Source: vendor; https://gnats.netbsd.org/cgi-bin/query-pr-single.pl?number=51682
+Bug-debian: https://bugs.debian.org/cgi-bin/bugreport.cgi?bug=867986
+
+Index: ipsec-tools-0.8.2/src/racoon/isakmp_frag.c
+===================================================================
+--- ipsec-tools-0.8.2.orig/src/racoon/isakmp_frag.c
++++ ipsec-tools-0.8.2/src/racoon/isakmp_frag.c
+@@ -1,4 +1,4 @@
+-/* $NetBSD: isakmp_frag.c,v 1.5 2009/04/22 11:24:20 tteras Exp $ */
++/* $NetBSD: isakmp_frag.c,v 1.5.36.1 2017/04/21 16:50:42 bouyer Exp $ */
+
+ /* Id: isakmp_frag.c,v 1.4 2004/11/13 17:31:36 manubsd Exp */
+
+@@ -173,6 +173,43 @@ vendorid_frag_cap(gen)
+ return ntohl(hp[MD5_DIGEST_LENGTH / sizeof(*hp)]);
+ }
+
++static int
++isakmp_frag_insert(struct ph1handle *iph1, struct isakmp_frag_item *item)
++{
++ struct isakmp_frag_item *pitem = NULL;
++ struct isakmp_frag_item *citem = iph1->frag_chain;
++
++ /* no frag yet, just insert at beginning of list */
++ if (iph1->frag_chain == NULL) {
++ iph1->frag_chain = item;
++ return 0;
++ }
++
++ do {
++ /* duplicate fragment number, abort (CVE-2016-10396) */
++ if (citem->frag_num == item->frag_num)
++ return -1;
++
++ /* need to insert before current item */
++ if (citem->frag_num > item->frag_num) {
++ if (pitem != NULL)
++ pitem->frag_next = item;
++ else
++ /* insert at the beginning of the list */
++ iph1->frag_chain = item;
++ item->frag_next = citem;
++ return 0;
++ }
++
++ pitem = citem;
++ citem = citem->frag_next;
++ } while (citem != NULL);
++
++ /* we reached the end of the list, insert */
++ pitem->frag_next = item;
++ return 0;
++}
++
+ int
+ isakmp_frag_extract(iph1, msg)
+ struct ph1handle *iph1;
+@@ -224,39 +261,43 @@ isakmp_frag_extract(iph1, msg)
+ item->frag_next = NULL;
+ item->frag_packet = buf;
+
+- /* Look for the last frag while inserting the new item in the chain */
+- if (item->frag_last)
+- last_frag = item->frag_num;
++ /* Check for the last frag before inserting the new item in the chain */
++ if (item->frag_last) {
++ /* if we have the last fragment, indices must match */
++ if (iph1->frag_last_index != 0 &&
++ item->frag_last != iph1->frag_last_index) {
++ plog(LLV_ERROR, LOCATION, NULL,
++ "Repeated last fragment index mismatch\n");
++ racoon_free(item);
++ vfree(buf);
++ return -1;
++ }
+
+- if (iph1->frag_chain == NULL) {
+- iph1->frag_chain = item;
+- } else {
+- struct isakmp_frag_item *current;
++ last_frag = iph1->frag_last_index = item->frag_num;
++ }
+
+- current = iph1->frag_chain;
+- while (current->frag_next) {
+- if (current->frag_last)
+- last_frag = item->frag_num;
+- current = current->frag_next;
+- }
+- current->frag_next = item;
++ /* insert fragment into chain */
++ if (isakmp_frag_insert(iph1, item) == -1) {
++ plog(LLV_ERROR, LOCATION, NULL,
++ "Repeated fragment index mismatch\n");
++ racoon_free(item);
++ vfree(buf);
++ return -1;
+ }
+
+- /* If we saw the last frag, check if the chain is complete */
++ /* If we saw the last frag, check if the chain is complete
++ * we have a sorted list now, so just walk through */
+ if (last_frag != 0) {
++ item = iph1->frag_chain;
+ for (i = 1; i <= last_frag; i++) {
+- item = iph1->frag_chain;
+- do {
+- if (item->frag_num == i)
+- break;
+- item = item->frag_next;
+- } while (item != NULL);
+-
++ if (item->frag_num != i)
++ break;
++ item = item->frag_next;
+ if (item == NULL) /* Not found */
+ break;
+ }
+
+- if (item != NULL) /* It is complete */
++ if (i > last_frag) /* It is complete */
+ return 1;
+ }
+
+@@ -291,15 +332,9 @@ isakmp_frag_reassembly(iph1)
+ }
+ data = buf->v;
+
++ item = iph1->frag_chain;
+ for (i = 1; i <= frag_count; i++) {
+- item = iph1->frag_chain;
+- do {
+- if (item->frag_num == i)
+- break;
+- item = item->frag_next;
+- } while (item != NULL);
+-
+- if (item == NULL) {
++ if (item->frag_num != i) {
+ plog(LLV_ERROR, LOCATION, NULL,
+ "Missing fragment #%d\n", i);
+ vfree(buf);
+@@ -308,6 +343,7 @@ isakmp_frag_reassembly(iph1)
+ }
+ memcpy(data, item->frag_packet->v, item->frag_packet->l);
+ data += item->frag_packet->l;
++ item = item->frag_next;
+ }
+
+ out:
+Index: ipsec-tools-0.8.2/src/racoon/isakmp_inf.c
+===================================================================
+--- ipsec-tools-0.8.2.orig/src/racoon/isakmp_inf.c
++++ ipsec-tools-0.8.2/src/racoon/isakmp_inf.c
+@@ -720,6 +720,7 @@ isakmp_info_send_nx(isakmp, remote, loca
+ #endif
+ #ifdef ENABLE_FRAG
+ iph1->frag = 0;
++ iph1->frag_last_index = 0;
+ iph1->frag_chain = NULL;
+ #endif
+
+Index: ipsec-tools-0.8.2/src/racoon/isakmp.c
+===================================================================
+--- ipsec-tools-0.8.2.orig/src/racoon/isakmp.c
++++ ipsec-tools-0.8.2/src/racoon/isakmp.c
+@@ -1071,6 +1071,7 @@ isakmp_ph1begin_i(rmconf, remote, local)
+ iph1->frag = 1;
+ else
+ iph1->frag = 0;
++ iph1->frag_last_index = 0;
+ iph1->frag_chain = NULL;
+ #endif
+ iph1->approval = NULL;
+@@ -1175,6 +1176,7 @@ isakmp_ph1begin_r(msg, remote, local, et
+ #endif
+ #ifdef ENABLE_FRAG
+ iph1->frag = 0;
++ iph1->frag_last_index = 0;
+ iph1->frag_chain = NULL;
+ #endif
+ iph1->approval = NULL;
+Index: ipsec-tools-0.8.2/src/racoon/handler.h
+===================================================================
+--- ipsec-tools-0.8.2.orig/src/racoon/handler.h
++++ ipsec-tools-0.8.2/src/racoon/handler.h
+@@ -1,4 +1,4 @@
+-/* $NetBSD: handler.h,v 1.25 2010/11/17 10:40:41 tteras Exp $ */
++/* $NetBSD: handler.h,v 1.26 2017/01/24 19:23:56 christos Exp $ */
+
+ /* Id: handler.h,v 1.19 2006/02/25 08:25:12 manubsd Exp */
+
+@@ -141,6 +141,7 @@ struct ph1handle {
+ #endif
+ #ifdef ENABLE_FRAG
+ int frag; /* IKE phase 1 fragmentation */
++ int frag_last_index;
+ struct isakmp_frag_item *frag_chain; /* Received fragments */
+ #endif
+
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