From d454a6748c34f0f67eef618238e0a64b80c85303 Mon Sep 17 00:00:00 2001
From: Umut Tezduyar Lindskog <umut.tezduyar@axis.com>
Date: Sun, 30 Mar 2014 19:09:14 +0200
Subject: sd-dhcp: check for udp packets

Do not try to parse ICMP packets

[tomegun: slightly tweaked debug message]
---
 src/libsystemd-network/dhcp-packet.c | 5 +++++
 1 file changed, 5 insertions(+)

(limited to 'src')

diff --git a/src/libsystemd-network/dhcp-packet.c b/src/libsystemd-network/dhcp-packet.c
index bed942fd84..9779cbd51d 100644
--- a/src/libsystemd-network/dhcp-packet.c
+++ b/src/libsystemd-network/dhcp-packet.c
@@ -157,6 +157,11 @@ int dhcp_packet_verify_headers(DHCPPacket *packet, size_t len, bool checksum) {
 
         /* UDP */
 
+        if (packet->ip.protocol != IPPROTO_UDP) {
+                log_dhcp_client(client, "ignoring packet: not UDP");
+                return -EINVAL;
+        }
+
         if (len < DHCP_IP_UDP_SIZE) {
                 log_dhcp_client(client, "ignoring packet: packet (%zu bytes) "
                                 " smaller than IP+UDP header (%u bytes)", len,
-- 
cgit v1.2.3-54-g00ecf