[bug 27612] NULL pointer dereference in xHCI for hubs with missing TT

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Hello,

I just filed a bug on kernel.org, and Greg K-H suggested I also
mention it directly here. It's bug 27612 on kernel.org:

https://bugzilla.kernel.org/show_bug.cgi?id=27612

This is a fairly minor bug, since as far as I know the only way to
trigger it is via a buggy or malicious USB hub device. However, in the
event of a malicious USB device, this bug could be used as a DoS to
the hub thread, making the USB subsystem somewhat unusable until
reboot.

Thanks in advance for taking a look!

--beth
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