From 0c95312c507bc2dea3a42bb5e3e40ed55dab7e45 Mon Sep 17 00:00:00 2001
From: roy <roy@NetBSD.org>
Date: Fri, 13 Sep 2019 11:54:03 +0000
Subject: [PATCH] Sync

---
 external/bsd/dhcpcd/dist/src/dhcp.c | 6 ++++++
 1 file changed, 6 insertions(+)

diff --git a/external/bsd/dhcpcd/dist/src/dhcp.c b/external/bsd/dhcpcd/dist/src/dhcp.c
index 3d8e46bdebc9..1fb2f4a10fcd 100644
--- a/external/bsd/dhcpcd/dist/src/dhcp.c
+++ b/external/bsd/dhcpcd/dist/src/dhcp.c
@@ -3264,7 +3264,13 @@ valid_udp_packet(void *packet, size_t plen, struct in_addr *from,
 	if (from != NULL)
 		from->s_addr = ip->ip_src.s_addr;
 
+	/* Check we have the IP header */
 	ip_hlen = (size_t)ip->ip_hl * 4;
+	if (ip_hlen > plen) {
+		errno = ENOBUFS;
+		return -1;
+	}
+
 	if (in_cksum(ip, ip_hlen, NULL) != 0) {
 		errno = EINVAL;
 		return -1;