libX11: Multiple integer overflows leading to heap-based buffer-overflows

Multiple integer overflows in X.org libX11 1.5.99.901 1.6 RC1 and earlier allow X servers to trigger allocation of insufficient memory and a buffer overflow via vectors related to the 1 XQueryFont, 2 XF86BigfontQueryFont, 3 XListFontsWithInfo, 4 XGetMotionEvents, 5 XListHosts, 6...