From c591a4d3cc85343933f242a8aad5993a1dfeaf04 Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Adrien=20Gallou=C3=ABt?= <adrien@gallouet.fr>
Date: Wed, 4 Jan 2017 14:15:18 +0000
Subject: [PATCH] Drop too large packets

---
 src/main.c | 5 +++--
 1 file changed, 3 insertions(+), 2 deletions(-)

diff --git a/src/main.c b/src/main.c
index b45f81f..534780d 100644
--- a/src/main.c
+++ b/src/main.c
@@ -385,10 +385,11 @@ main(int argc, char **argv)
         if (FD_ISSET(tun_fd, &rfds)) {
             size_t size = 0;
 
-            while (sizeof(buf) - size > gt.mtu) {
+            while (sizeof(buf) - size >= gt.mtu) {
                 const ssize_t r = tun_read(tun_fd, &buf[size],
                                            sizeof(buf) - size);
-                if (r <= 0)
+
+                if (r <= 0 || r > gt.mtu)
                     break;
 
                 struct ip_common ic;