From 598746aefe428c36d0bd3efab2c906bd1dc69aa5 Mon Sep 17 00:00:00 2001
From: Jake McGinty <me@jake.su>
Date: Sat, 10 Feb 2018 15:38:12 +0000
Subject: keepalive short-circuit and panic-safe

---
 src/ip_packet.rs | 4 ++++
 1 file changed, 4 insertions(+)

(limited to 'src/ip_packet.rs')

diff --git a/src/ip_packet.rs b/src/ip_packet.rs
index 4aa7ecb..5f342b8 100644
--- a/src/ip_packet.rs
+++ b/src/ip_packet.rs
@@ -10,6 +10,10 @@ pub enum IpPacket<'a> {
 
 impl<'a> IpPacket<'a> {
     pub fn new(packet: &'a [u8]) -> Option<Self> {
+        if packet.len() == 0 {
+            return None;
+        }
+
         match packet[0] >> 4 {
             4 => Ipv4Packet::new(&packet).map(|packet| IpPacket::V4(packet)),
             6 => Ipv6Packet::new(&packet).map(|packet| IpPacket::V6(packet)),
-- 
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