From 4988479df4b942dd342c234e13c4000207d05426 Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Adrien=20Gallou=C3=ABt?= <adrien@gallouet.fr>
Date: Thu, 5 Jan 2017 16:44:57 +0000
Subject: [PATCH] Drop packets with bad length (too small)

---
 src/ip.h | 4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)

diff --git a/src/ip.h b/src/ip.h
index e33a7e3..49b1fcd 100644
--- a/src/ip.h
+++ b/src/ip.h
@@ -30,7 +30,9 @@ ip_get_common(struct ip_common *ic, const uint8_t *data, size_t size)
         ic->proto = data[9];
         ic->hdr_size = (data[0] & 0xF) << 2;
         ic->size = ((data[2] << 8) | data[3]);
-        return 0;
+        if (ic->size >= 20)
+            return 0;
+        break;
     case 6:
         ic->tc = ((data[0] & 0xF) << 4) | (data[1] >> 4);
         ic->proto = data[6];