From eea72fcef3b616e9c1b3bd1cd18bc1ca0a991945 Mon Sep 17 00:00:00 2001
From: Egor Karavaev <batonius.kirov@gmail.com>
Date: Fri, 12 Jan 2018 22:10:46 +0300
Subject: [PATCH] Remove closed fd.

---
 src/smolnetd/scheme/netcfg.rs | 13 +++++++------
 1 file changed, 7 insertions(+), 6 deletions(-)

diff --git a/src/smolnetd/scheme/netcfg.rs b/src/smolnetd/scheme/netcfg.rs
index d629431fac..22a7479a88 100644
--- a/src/smolnetd/scheme/netcfg.rs
+++ b/src/smolnetd/scheme/netcfg.rs
@@ -402,12 +402,13 @@ impl SchemeMut for NetCfgScheme {
     }
 
     fn close(&mut self, fd: usize) -> SyscallResult<usize> {
-        let file = self.files
-            .get_mut(&fd)
-            .ok_or_else(|| SyscallError::new(syscall::EBADF))?;
-        let value =
-            str::from_utf8(&file.write_buf).or_else(|_| Err(SyscallError::new(syscall::EINVAL)))?;
-        file.cfg_node.borrow().write(&value)
+        if let Some(file) = self.files.remove(&fd) {
+            let value = str::from_utf8(&file.write_buf)
+                .or_else(|_| Err(SyscallError::new(syscall::EINVAL)))?;
+            file.cfg_node.borrow().write(&value)
+        } else {
+            Err(SyscallError::new(syscall::EBADF))
+        }
     }
 
     fn write(&mut self, fd: usize, buf: &[u8]) -> SyscallResult<usize> {