OpenBSD/xenocara BoRQQzTxserver/Xi xibarriers.c

   MFC: Xi: integer overflow and unvalidated length in
        (S)ProcXIBarrierReleasePointer

   [jcristau: originally this patch fixed the same issue as commit
   211e05ac85 "Xi: Test exact size of XIBarrierReleasePointer", with the
   addition of these checks]

   This addresses CVE-2017-12179
VersionDeltaFile
1.5+5-0xserver/Xi/xibarriers.c
+5-01 files

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