Missing extra length validation was found in ProcEstablishConnection function. Upstream patch: https://cgit.freedesktop.org/xorg/xserver/commit/?id=b747da5e25be944337a9cd1415506fc06b70aa81
Acknowledgments: Name: the Xorg project
Created xorg-x11-server tracking bugs for this issue: Affects: fedora-all [bug 1509258]