Description: Do not segfault on listenSock/listen6Sock
Author: mackyle

Index: libvncserver/libvncserver/sockets.c
===================================================================
--- libvncserver.orig/libvncserver/sockets.c	2014-05-01 10:11:04.295952467 +0200
+++ libvncserver/libvncserver/sockets.c	2014-05-01 10:16:22.953295982 +0200
@@ -402,9 +402,9 @@
       rfbLogPerror("rfbProcessNewConnection: error in select");
       return FALSE;
     }
-    if (FD_ISSET(rfbScreen->listenSock, &listen_fds)) 
+    if (rfbScreen->listenSock >= 0 && FD_ISSET(rfbScreen->listenSock, &listen_fds)) 
       chosen_listen_sock = rfbScreen->listenSock;
-    if (FD_ISSET(rfbScreen->listen6Sock, &listen_fds)) 
+    if (rfbScreen->listen6Sock >= 0 && FD_ISSET(rfbScreen->listen6Sock, &listen_fds)) 
       chosen_listen_sock = rfbScreen->listen6Sock;
 
     if ((sock = accept(chosen_listen_sock,