[PATCH] os: Make sure big requests have sufficient length.

[Michal Srb]

Here is a script that can be used to crash X server using a broken big request 
for PolyLine. It connects to DISPLAY=:1 and doesn't support authentication. 
Look inside the script for more details.

Other requests could be used to crash X server in similar way, for example 
SetFontPath.

Michal Srb
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