From 3b6de6ec1f16420f9c558e565071968ebeb67eff Mon Sep 17 00:00:00 2001
From: Xiaoxiao <i@pxx.io>
Date: Tue, 28 Jun 2016 01:04:34 +0800
Subject: fix buffer overflow

---
 gre.c | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

(limited to 'gre.c')

diff --git a/gre.c b/gre.c
index e4be7f6..22ac0f6 100644
--- a/gre.c
+++ b/gre.c
@@ -52,7 +52,7 @@ int main(int argc, char **argv)
 {
 	fd_set readset;
 
-	if (argc != 4) 
+	if (argc != 4)
 	{
 		printf("usage: %s <tun> remote local\n", argv[0]);
 		return EXIT_FAILURE;
@@ -180,7 +180,7 @@ static void tun_cb(void)
 {
 	int n;
 
-	n = read(tun, buf + 4, sizeof(buf));
+	n = read(tun, buf + 4, sizeof(buf) - 4);
 	if (n < 0)
 	{
 		perror("read");
-- 
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