The xorg server crashes when interfaces are present in the system which
don't have an interface address assigned. ConvertAddr() in os/access.c
needs to check for a NULL pointer in sadr. Possible patch below.

Index: xorg-server-X11R7.0-1.0.1/os/access.c
===================================================================
--- xorg-server-X11R7.0-1.0.1.orig/os/access.c
+++ xorg-server-X11R7.0-1.0.1/os/access.c
@@ -1858,6 +1858,8 @@ ConvertAddr (
 {
     if (*len == 0)
         return (FamilyLocal);
+    if (!saddr)
+        return -1;
     switch (saddr->sa_family)
     {
     case AF_UNSPEC: