From 7f1eddc84d835423406ebf082cbbbdf9fc4b5025 Mon Sep 17 00:00:00 2001
From: Jeremy Soller <jackpot51@gmail.com>
Date: Sat, 22 Jul 2017 13:16:41 -0600
Subject: [PATCH] Return error when dup buf is not empty

---
 src/ethernetd/scheme.rs | 6 +++++-
 src/ipd/main.rs         | 6 +++++-
 2 files changed, 10 insertions(+), 2 deletions(-)

diff --git a/src/ethernetd/scheme.rs b/src/ethernetd/scheme.rs
index bbd6bc94df..f6da2aa7a3 100644
--- a/src/ethernetd/scheme.rs
+++ b/src/ethernetd/scheme.rs
@@ -85,7 +85,11 @@ impl SchemeMut for EthernetScheme {
         }
     }
 
-    fn dup(&mut self, id: usize, _buf: &[u8]) -> Result<usize> {
+    fn dup(&mut self, id: usize, buf: &[u8]) -> Result<usize> {
+        if ! buf.is_empty() {
+            return Err(Error::new(EINVAL));
+        }
+
         let next_id = self.next_id;
         self.next_id += 1;
 
diff --git a/src/ipd/main.rs b/src/ipd/main.rs
index 49e332fcf7..c5ce140634 100644
--- a/src/ipd/main.rs
+++ b/src/ipd/main.rs
@@ -150,7 +150,11 @@ impl SchemeMut for Ipd {
         }
     }
 
-    fn dup(&mut self, file: usize, _buf: &[u8]) -> Result<usize> {
+    fn dup(&mut self, file: usize, buf: &[u8]) -> Result<usize> {
+        if ! buf.is_empty() {
+            return Err(Error::new(EINVAL));
+        }
+
         let handle = {
             let handle = self.handles.get(&file).ok_or(Error::new(EBADF))?;
             Handle {