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-rw-r--r--src/linux/tun.c3
1 files changed, 3 insertions, 0 deletions
diff --git a/src/linux/tun.c b/src/linux/tun.c
index bcf1885..88d6d6e 100644
--- a/src/linux/tun.c
+++ b/src/linux/tun.c
@@ -157,6 +157,9 @@ int tun_write(tun_device_t* dev, u_int8_t* buf, u_int32_t len)
if(!dev || dev->fd_ < 0)
return -1;
+ if(!buf)
+ return 0;
+
if(dev->with_pi_)
{
struct iovec iov[2];