From 32af6f97236ad31b8d5d6aa9c60a2098af0d9b5c Mon Sep 17 00:00:00 2001
From: Wei Liu <liuwe@microsoft.com>
Date: Wed, 17 Nov 2021 17:34:45 +0000
Subject: [PATCH] virtio-device: add a safety comment for a dup(2) call

Signed-off-by: Wei Liu <liuwe@microsoft.com>
---
 virtio-devices/src/net.rs | 1 +
 1 file changed, 1 insertion(+)

diff --git a/virtio-devices/src/net.rs b/virtio-devices/src/net.rs
index bf88d8eba..303c44537 100644
--- a/virtio-devices/src/net.rs
+++ b/virtio-devices/src/net.rs
@@ -488,6 +488,7 @@ impl Net {
 
         for fd in fds.iter() {
             // Duplicate so that it can survive reboots
+            // SAFETY: FFI call to dup. Trivially safe.
             let fd = unsafe { libc::dup(*fd) };
             if fd < 0 {
                 return Err(Error::DuplicateTapFd(std::io::Error::last_os_error()));