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AndroidKernelMSM

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msm: mdss: fix possible out-of-bounds and overflow issue in mdp debugfs
Adrian Salido-Moreno authored and Yuan Lin committed 
There are few cases where the count argument passed by the user
space is not validated, which can potentially lead to out of bounds
or overflow issues. In some cases, kernel might copy more data than
what is requested. Add necessary checks to avoid such cases.

BUG=27407629
BUG=27407865

Change-Id: Ief031297961b812163cdfaf5146615b3ee67de46
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