Do I need a diode on USB power injector circuit?

Published: 5/10/2017
Do I need a diode on USB power injector circuit?
Source: ELECTRONICS.STACKEXCHANGE.COM

I'm building a simple USB power injector. I just wan't to know If I need a diode to protect my computer from power injection (I only inject 5v) or just rely on the motherboard's USB protection circuit which has a diode connected at + of USB port? simulate this circuit – Schematic created using CircuitLab

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