xcmisc: unvalidated length in SProcXCMiscGetXIDList() [CVE-2014-8096]

Signed-off-by: Alan Coopersmith <alan.coopersmith@oracle.com>
Reviewed-by: Peter Hutterer <peter.hutterer@who-t.net>

Xext/xcmisc.c

@@ -167,6 +167,7 @@ static int
 SProcXCMiscGetXIDList(ClientPtr client)
 {
     REQUEST(xXCMiscGetXIDListReq);
+    REQUEST_SIZE_MATCH(xXCMiscGetXIDListReq);
 
     swaps(&stuff->length);
     swapl(&stuff->count);