Fixes xfixes: unvalidated lengths (CVE-2017-12183) Xi: fix wrong extra length check in ProcXIChangeHierarchy (CVE-2017-12178) dbe: Unvalidated variable-length request in ProcDbeGetVisualInfo (CVE-2017-12177) Unvalidated extra length in ProcEstablishConnection (CVE-2017-12176) Signed-off-by: Bernd Kuhls <bernd.kuhls@t-online.de> Signed-off-by: Thomas Petazzoni <thomas.petazzoni@free-electrons.com>