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Fix XChangeFeedbackControl() request underflow

Matthieu Herrb requested to merge mherrb/xserver:server-1.20-branch into server-1.20-branch

CVE-2021-3472 / ZDI-CAN-1259

This vulnerability was discovered by: Jan-Niklas Sohn working with Trend Micro Zero Day Initiative

Signed-off-by: Matthieu Herrb matthieu@herrb.eu

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