Apply patch, requested my mrg in ticket 1263:
xsrc/xfree/xc/lib/X11/FontNames.c patch
xsrc/xfree/xc/lib/X11/GetImage.c patch
xsrc/xfree/xc/lib/X11/ListExt.c patch
xsrc/xfree/xc/lib/X11/ModMap.c patch
xsrc/xfree/xc/lib/X11/Xlibint.h patch
xsrc/xfree/xc/lib/Xi/XGMotion.c patch
xsrc/xfree/xc/lib/Xi/XGetBMap.c patch
xsrc/xfree/xc/lib/Xi/XGetDCtl.c patch
xsrc/xfree/xc/lib/Xi/XGetFCtl.c patch
xsrc/xfree/xc/lib/Xi/XGetKMap.c patch
xsrc/xfree/xc/lib/Xi/XGetMMap.c patch
xsrc/xfree/xc/lib/Xi/XOpenDev.c patch
xsrc/xfree/xc/lib/Xi/XQueryDv.c patch
xsrc/xfree/xc/lib/Xrender/Filter.c patch
xsrc/xfree/xc/lib/Xrender/Xrender.c patch
xsrc/xfree/xc/lib/Xtst/XRecord.c patch
xsrc/xfree/xc/lib/Xv/Xv.c patch
xsrc/xfree/xc/programs/Xserver/include/dix.h patch

Fix (backported from upstream) the following issues in X client
libraries:
libX11 - insufficient validation of data from the X server
can cause out of boundary memory read (XGetImage())
or write (XListFonts()).
Affected versions libX11 <= 1.6.3

libXfixes - insufficient validation of data from the X server
can cause an integer overflow on 32 bit architectures.
Affected versions : libXfixes <= 5.0.2

libXi - insufficient validation of data from the X server
can cause out of boundary memory access or
endless loops (Denial of Service).
Affected versions libXi <= 1.7.6

libXrandr - insufficient validation of data from the X server
can cause out of boundary memory writes.
Affected versions: libXrandr <= 1.5.0

libXrender - insufficient validation of data from the X server
can cause out of boundary memory writes.
Affected version: libXrender <= 0.9.9

XRecord - insufficient validation of data from the X server
can cause out of boundary memory access or
endless loops (Denial of Service).
Affected version libXtst <= 1.2.2

libXv - insufficient validation of data from the X server
can cause out of boundary memory and memory corruption.
CVE-2016-5407
affected versions libXv <= 1.0.10

libXvMC - insufficient validation of data from the X server
can cause a one byte buffer read underrun.
Affected versions: libXvMC <= 1.0.9

(bouyer)