From b21de2e398b3760b51be4d2325c114b8727b72f0 Mon Sep 17 00:00:00 2001
From: "Jason A. Donenfeld" <Jason@zx2c4.com>
Date: Thu, 1 Nov 2018 22:01:52 +0100
Subject: [PATCH] NetworkExtension: check isTunnelClosed before packet
 existence

Signed-off-by: Jason A. Donenfeld <Jason@zx2c4.com>
---
 .../WireGuardNetworkExtension/PacketTunnelProvider.swift      | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/WireGuard/WireGuardNetworkExtension/PacketTunnelProvider.swift b/WireGuard/WireGuardNetworkExtension/PacketTunnelProvider.swift
index 48f840b..7fc12cf 100644
--- a/WireGuard/WireGuardNetworkExtension/PacketTunnelProvider.swift
+++ b/WireGuard/WireGuardNetworkExtension/PacketTunnelProvider.swift
@@ -163,9 +163,9 @@ class PacketTunnelProvider: NEPacketTunnelProvider {
                         guard let buf = buf else { return 0 }
                         let wgContext = wgCtxPtr.bindMemory(to: WireGuardContext.self, capacity: 1).pointee
                         var isTunnelClosed = false
-                        guard let packet = wgContext.readPacket(isTunnelClosed: &isTunnelClosed) else { return 0 }
+                        let packet = wgContext.readPacket(isTunnelClosed: &isTunnelClosed)
                         if isTunnelClosed { return -1 }
-                        let packetData = packet.data
+                        guard let packetData = packet?.data else { return 0 }
                         if packetData.count <= len {
                             packetData.copyBytes(to: buf, count: packetData.count)
                             return packetData.count