From aa534a0936c44694b9dfb153c7d0874ec4e15615 Mon Sep 17 00:00:00 2001
From: Laurent Gomila <laurent.gom@gmail.com>
Date: Tue, 26 Jun 2012 21:55:45 +0200
Subject: [PATCH] Fixed crash in SocketSelector::add when passing an invalid
 socket

---
 include/SFML/Network/SocketSelector.hpp |  3 ++-
 src/SFML/Network/SocketSelector.cpp     | 12 ++++++++----
 2 files changed, 10 insertions(+), 5 deletions(-)

diff --git a/include/SFML/Network/SocketSelector.hpp b/include/SFML/Network/SocketSelector.hpp
index a6713cbd..5dd03a53 100644
--- a/include/SFML/Network/SocketSelector.hpp
+++ b/include/SFML/Network/SocketSelector.hpp
@@ -70,6 +70,7 @@ public :
     /// This function keeps a weak reference to the socket,
     /// so you have to make sure that the socket is not destroyed
     /// while it is stored in the selector.
+    /// This function does nothing if the socket is not valid.
     ///
     /// \param socket Reference to the socket to add
     ///
@@ -186,7 +187,7 @@ private :
 /// A selector doesn't store its own copies of the sockets
 /// (socket classes are not copyable anyway), it simply keeps
 /// a reference to the original sockets that you pass to the
-/// Add function. Therefore, you can't use the selector as a
+/// "add" function. Therefore, you can't use the selector as a
 /// socket container, you must store them oustide and make sure
 /// that they are alive as long as they are used in the selector.
 ///
diff --git a/src/SFML/Network/SocketSelector.cpp b/src/SFML/Network/SocketSelector.cpp
index ace5d1a8..3a23c102 100644
--- a/src/SFML/Network/SocketSelector.cpp
+++ b/src/SFML/Network/SocketSelector.cpp
@@ -73,11 +73,15 @@ SocketSelector::~SocketSelector()
 ////////////////////////////////////////////////////////////
 void SocketSelector::add(Socket& socket)
 {
-    FD_SET(socket.getHandle(), &m_impl->AllSockets);
+    SocketHandle handle = socket.getHandle();
+    if (handle != SocketImpl::invalidSocket())
+    {
+        FD_SET(handle, &m_impl->AllSockets);
 
-    int size = static_cast<int>(socket.getHandle());
-    if (size > m_impl->MaxSocket)
-        m_impl->MaxSocket = size;
+        int size = static_cast<int>(handle);
+        if (size > m_impl->MaxSocket)
+            m_impl->MaxSocket = size;
+    }
 }