diff --git a/net/ipv4/icmp.c b/net/ipv4/icmp.c
index d5d745c3e345..2b09ef70752f 100644
--- a/net/ipv4/icmp.c
+++ b/net/ipv4/icmp.c
@@ -746,6 +746,11 @@ void __icmp_send(struct sk_buff *skb_in, int type, int code, __be32 info,
 		room = 576;
 	room -= sizeof(struct iphdr) + icmp_param.replyopts.opt.opt.optlen;
 	room -= sizeof(struct icmphdr);
+	/* Guard against tiny mtu. We need to include at least one
+	 * IP network header for this message to make any sense.
+	 */
+	if (room <= (int)sizeof(struct iphdr))
+		goto ende;
 
 	icmp_param.data_len = skb_in->len - icmp_param.offset;
 	if (icmp_param.data_len > room)